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TECHNICAL COMMITTEE ON WASTEWATER TREATMENT PLANTS
First Draft Meeting Agenda September 10-12, 2013
Hampton Inn, Columbus, Ohio
September 10 (12 PM-5 PM) September 11 (8 AM-5 PM)
September 12 (8 AM-12 PM) Note- Lunch will be provided on day one. Continental Breakfast served both mornings, days 2-3 at 7:30 AM. 1). Welcome-Committee Chair, Glenn McGinley. 2). Introduction of Attendees and Update of Committee Roster. 3). Approval of Minutes of Last Meeting/Conference call - July 9, 2013. (attached-820_WAA_preFDMinutes-07_13.pdf) 4). Staff updates-Nancy Pearce.
a) Committee membership update. (attached-WAA-AAA- Aug 2013) b) Annual 2015 revision cycle schedule. (attached-Schedule A2015.pdf) c) New Process Presentation-Nancy Pearce NFPA Staff. 5). Review of Public Inputs NFPA 820. (attached—820 Public Input) 6). Additional First Revision Considerations for Committee-Task Group Work. a) NFPA 72 Signaling/Alarms (attached-Groppetti NFPA 72.docx) b) Exclusions in NFPA 820 (attached-Wheeler 1.1.3.docx and Wheeler def sewers.docx) c) Chapter 9 Ventilation d) Combustible Dust e) Co-generation f) Submersible Pumps g) Fine Screening h) Combustible Gas Detection i) NFPA 54 7). Additional Issues for Consideration. a) Table format change Proposal (attached NFPA 820 Table revisions v2.xlsx and v3.xlsx) b) Staff review of issues for consideration (attached-Committee work compiled.docx) c) NFPA 56 letter requesting incorporation by reference (attached-NFPA 56 letter.docx) d) Other ( Wheeler B.4.2.docx) 8). Adjournment.
Pre-First Draft Meeting Technical Committee on Wastewater Treatment Plants
On line/Conference Call July 9, 2013 2-4 PM EDT
(1-3:00 PM CT; 12-2:00 PM MT; 11-1:00 PM PT)
Attendees: Glenn McGinley-Chair Josef Berktold, WEF Bradley Cyrus, Gormann-Rupp Company Garr Jones, Brown and Caldwell Linda Leong, San Francisco Public Utilities Diep Nguyen, DTN Engineers, Inc Thomas Stilwell, Xtralis James Wheeler, EPA Claudio Groppetti, Xtralis Jeff Leano, City and County of San Francisco Dan Olah, Applicant Nancy Pearce, NFPA Staff James Grimard, NFPA Intern
1. Welcome and Introductions-Glenn McGinley, Committee Chair, welcomed committee members and outlined the meeting agenda.
2. Meeting Minutes from March 14, 2013 were approved as written.
3. Public Inputs for NFPA 820. The chair told the committee that 51 public inputs had been
received for NFPA 820, possibly a record number of inputs for this document in recent years. The committee will have to review all 51 inputs in addition to other task group input and other committee recommendations. It is expected that the meeting will take the full two days to complete.
4. Report from Task Groups
a. NFPA 72 Signaling/Alarm-drafts submitted via Terra. Task Group has met several times and has been working with NFPA 72 staff liaison as well to determine what coordination may be needed between terminology and requirements in NFPA 72, 720 and 820. Draft PIs will need some revision but they are in the system now as a placeholder for committee action at the September meeting in Columbus.
b. Exclusions on 820-Public input submitted by Jim Wheeler.
c. Chapter 9 Ventilation –No PIs submitted. James Grimard, NFPA Intern explained to the committee that he had done some research on the origins of the ventilation standards, which appear to come from the 1978 Ten states standard. James has done a review of some of the previous NFPA 820 revisions to look for ventilation changes as well and will be putting together a summary for the committee. Dan Olah also shared some information about various Ontario ventilation codes. The task group may make recommendations for slight revisions at the meeting if need be based on further review.
d. Combustible Dust-coordination with NFPA 654. No PI submitted. Task group may recommend annex material or a committee input on the topic of combustible dust. A draft will be prepared for the committee to review prior to the meeting.
e. Co-generation. No PIs submitted. Committee recognizes need to address this issue but also will need to determine if other NFPA standards already apply. James Grimard will do some research on this subject and will get back to the committee.
f. Submersible Pumps-May put annex material to clarify that submersible pumps must still meet the requirements for Class 1 Division 1 electrical. Nancy indicated that many questions on this received through advisory service. Brad Cyrus will follow up with Task Group Chair, John Harrell and development Annex material or proposed standard language for review at the September meeting.
g. Fine Screening-No PI submitted. Glenn will develop draft revision for the meeting.
h. Combustible Gas Detection. No PI submitted. Diep will develop a draft revision for the meeting.
i. Joint task group with NFPA 54 (Bio-gas piping). Meetings with NFPA 54 indicate that committee may be removing bio-gas from the list of fuels covered by the standard because it is not a readily available fuel for commercial use. Task Group members will remain in contact with NFPA 54 and if this change occurs the Wastewater Treatment committee may need to develop changes to NFPA 820.
j. Ovens/Dryers NFPA 86. No task group work has taken place on this topic to date. Joe and Linda will contact the TG chair and develop a recommendation to the committee for the September meeting.
5. Other Committee Business
a. Consideration of new Table format (attached). James Grimard, NFPA intern, modified the existing tables in NFPA 820 to make them more “readable”. James provided several formats and options. The committee made a few suggestions and will consider one of the new formats at the September meeting. James will provide revised tables to Nancy for distribution and review prior to the meeting. b. Advisory Service questions-clarifications needed for upcoming revision. Nancy explained that NFPA 820 receives a fairly large number of advisory service questions. Nancy keeps track of some of the questions that have pointed to a need to clarify or revise the existing standard. Further review of these questions should be done prior to the September meeting.
6. First Draft meeting-Columbus Ohio, September 10-12, 2013. Committee members and
guests have until August 19th to make reservations at the NFPA rate. Meeting will start at noon on Sept 10th and end at noon on September 12th. A full agenda with attachments will be sent prior to the meeting date.
7. Adjournment. Meeting was adjourned at 3:45 PM.
Address List No PhoneWastewater Treatment Plants WAA-AAA
Nancy Pearce08/29/2013
WAA-AAA
Glenn E. McGinley, II
ChairOhio Public Employment Risk Reduction Program4448 Prairie Creek LaneMaumee, OH 43537-9020
E 1/16/2003WAA-AAA
Josef Berktold
PrincipalDonohue Associates3311 Weeden Creek RoadSheboygan, WI 53081Water Environment Federation
U 08/09/2012
WAA-AAA
John G. Brosnan
PrincipalCH2M HILL7075 Maynard Place ENew Albany, OH 43054Alternate: Sam Rizzi
SE 08/09/2012WAA-AAA
Bradley A. Cyrus
PrincipalThe Gorman-Rupp CompanyPO Box 1217Mansfield, OH 44901Water & Wastewater Equipment Manufacturers Assn., Inc.
M 1/10/2008
WAA-AAA
John N. Harrell
PrincipalWilson & Company, Inc.800 East 101st Terrace, Suite 200Kansas City, MO 64131Alternate: Mark W. Peterson
SE 1/1/1987WAA-AAA
Clark A. Henry
PrincipalEnvironment One Corporation2773 Balltown RoadNiskayuna, NY 12309Alternate: George A. Earle, III
M 10/4/2007
WAA-AAA
Garr M. Jones
PrincipalBrown and Caldwell308A Wood Run DriveWhitefish, MT 59937Alternate: Scott Hall
SE 1/1/1984WAA-AAA
Stephan Larmann
PrincipalSchischek Inc.4460 Brookfield Corporate Drive, Suite BChantilly, VA 20151
M 08/09/2012
WAA-AAA
Linda Leong
PrincipalSan Francisco Public Utilities Commission750 Phelps StreetSan Francisco, CA 94124Alternate: Jeff Leano
U 3/21/2006WAA-AAA
Christine Minor
PrincipalCity of Toledo, Division of Water Reclamation3900 North Summit Street, Bldg. 1Toledo, OH 43611
U 10/4/2007
WAA-AAA
Diep T. Nguyen
PrincipalDTN Engineers, Inc.1611 Telegraph Avenue, Suite 809Oakland, CA 94612Alternate: Charles D. Olah
SE 10/18/2011WAA-AAA
Gerald P. Robinson
PrincipalHatch Mott MacDonald5111 North 12th AvenuePensacola, FL 32514Alternate: Scott R. Connor
SE 10/29/2012
WAA-AAA
Thomas D. Stilwell
PrincipalXtralis, Inc.700 Longwater Drive, Suite 100Norwell, MA 02061Alternate: Claudio C. Groppetti
M 8/2/2010WAA-AAA
James F. Wheeler
PrincipalUS Environmental Protection Agency1200 Pennsylvania Avenue, NWMail Code 4204MWashington, DC 20460
E 1/1/1982
1
Address List No PhoneWastewater Treatment Plants WAA-AAA
Nancy Pearce08/29/2013
WAA-AAA
Scott R. Connor
AlternateTeam-1 Academy Inc.760 Pacific Road, Unit 19Oakville, ON L6L 6M5 CanadaPrincipal: Gerald P. Robinson
SE 03/07/2013WAA-AAA
George A. Earle, III
AlternateEnvironment One Corporation2773 Balltown RoadNiskayuna, NY 12309Principal: Clark A. Henry
M 10/4/2007
WAA-AAA
Claudio C. Groppetti
AlternateXtralis, Inc.2445 Heron LaneVictoria, MN 55386Principal: Thomas D. Stilwell
M 10/18/2011WAA-AAA
Scott Hall
AlternateBrown and Caldwell990 Hammond Drive, Suite 400Atlanta, GA 30328Principal: Garr M. Jones
SE 10/29/2012
WAA-AAA
Jeff Leano
AlternateCity And County of San Francisco1325a Evans AvenueSan Francisco, CA 94124Principal: Linda Leong
U 08/09/2012WAA-AAA
Charles D. Olah
AlternateEMA Canada2381 Bristol Circle, Suite A200Oakville, ON L6H 5S9 CanadaPrincipal: Diep T. Nguyen
SE 07/29/2013
WAA-AAA
Mark W. Peterson
AlternateWilson & Company, Inc.1700 East Iron AvenueSalina, KS 67401Principal: John N. Harrell
SE 03/07/2013WAA-AAA
Sam Rizzi
AlternateHILL
1103 Schrock RoadColumbus, OH 43229Principal: John G. Brosnan
SE 03/07/2013
WAA-AAA
Nancy Pearce
Staff LiaisonNational Fire Protection Association1 Batterymarch ParkQuincy, MA 02169-7471
1/11/2012
2
2015 ANNUAL REVISION CYCLE *Public Input Dates may vary according to standards and schedules for Revision Cycles may change. Please check the NFPA Website for the most up‐to‐date information on Public Input Closing Dates and schedules at
www.nfpa.org/document # (i.e. www.nfpa.org/101) and click on the Next Edition tab.
Process Stage
Process Step
Dates for
TC
Dates forTC with CC
Public Input Closing Date* 7/8/2013 7/8/2013
Final Date for TC First Draft Meeting 12/13/2013 9/13/2013
Public Input Posting of First Draft and TC Ballot 1/31/2014 10/25/2013
Stage Final date for Receipt of TC First Draft ballot 7/21/2014 11/15/2013
(First Draft) Final date for Receipt of TC First Draft ballot ‐ recirc 2/28/2014 11/22/2013
Posting of First Draft for CC Meeting 11/29/2013
Final date for CC First Draft Meeting 1/10/2014
Posting of First Draft and CC Ballot 1/31/2014
Final date for Receipt of CC First Draft ballot 2/21/2014
Final date for Receipt of CC First Draft ballot ‐ recirc 2/28/2014
Post First Draft Report for Public Comment 3/7/2014 3/7/2014
Public Comment Closing Date for Paper Submittal* 4/11/2014 4/11/2014
Public Comment Closing Date for Online Submittal (e‐PC)* 5/16/2014 5/16/2014
Final Date to Publish Notice of Consent Documents (Standards that received no Comments)
5/30/2014 5/30/2014
Appeal Closing Date for Consent Standards (Standards that received no Comments)
6/13/2014 6/13/2014
Final date for TC Second Draft Meeting 10/31/2014 7/25/2014
Comment Posting of Second Draft and TC Ballot 12/12/2014 9/5/2014
Stage Final date for Receipt of TC Second Draft ballot 1/2/2015 9/26/2014
(Second Final date for receipt of TC Second Draft ballot ‐ recirc 1/9/2015 10/3/2014
Draft) Posting of Second Draft for CC Meeting 10/10/2014
Final date for CC Second Draft Meeting 11/21/2014
Posting of Second Draft for CC Ballot 12/12/2014
Final date for Receipt of CC Second Draft ballot 1/2/2015
Final date for Receipt of CC Second Draft ballot ‐ recirc 1/9/2015
Post Second Draft Report for NITMAM Review 1/16/2015 1/16/2015
Tech Session Notice of Intent to Make a Motion (NITMAM) Closing Date 3/6/2015 3/6/2015
Preparation Posting of Certified Amending Motions (CAMs) and Consent Standards
5/1/2015 5/1/2015
(& Issuance) Appeal Closing Date for Consent Standards 5/16/2015 5/16/2015
SC Issuance Date for Consent Standards 5/26/2015 5/26/2015
Tech Session Association Meeting for Standards with CAMs 6/22‐25/2015 6/22‐25/2015
Appeals and Appeal Closing Date for Standards with CAMs 7/15/2015 7/15/2015
Issuance SC Issuance Date for Standards with CAMs 8/20/2015 8/20/2015
Approved___ October 18, 2011 _ Revised__March 7, 2013_____________
Public Input No. 45-NFPA 820-2013 [ Global Input ]
Revise "low flame spread" and "low flame spread rating" by "low flame spreadindex"
Statement of Problem and Substantiation for Public Input
Uses the correct terminology
Related Public Inputs for This Document
Related Input RelationshipPublic Input No. 40-NFPA 820-2013 [Section No. 3.3.50]
Submitter Information Verification
Submitter Full Name: Marcelo HirschlerOrganization: GBH InternationalStreet Address: City:State: Zip: Submittal Date: Sat Jul 06 19:58:53 EDT 2013
Copyright Assignment
I, Marcelo Hirschler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Marcelo Hirschler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 35-NFPA 820-2013 [ Section No. 1.3.4 ]
1.3.4 Ventilation Practices.Ventilation rates required by this standard shall be to minimize fire and explosion hazards, because insufficient ventilation rates can exposepersonnel to toxic and . The ventilation rates required for minimizing explosion risks may not be adequate to protect from toxicity or biologicalhazards.
Statement of Problem and Substantiation for Public Input
The current version was confusing.
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City:State: Zip: Submittal Date: Thu Jul 04 18:56:13 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 33-NFPA 820-2013 [ Section No. 2.2 ]
2.2 NFPA Publications.National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169-7471.
NFPA 10, Standard for Portable Fire Extinguishers, 2010 edition.
NFPA 11, Standard for Low-, Medium-, and High-Expansion Foam, 2010 edition.
NFPA 12, Standard on Carbon Dioxide Extinguishing Systems, 2011 edition.
NFPA 12A, Standard on Halon 1301 Fire Extinguishing Systems, 2009edition.NFPA 13, Standard for the Installation of Sprinkler Systems, 2010 edition.
NFPA 14, Standard for the Installation of Standpipe and Hose Systems, 2010 edition.
NFPA 15, Standard for Water Spray Fixed Systems for Fire Protection, 2012 edition.
NFPA 16, Standard for the Installation of Foam-Water Sprinkler and Foam-Water Spray Systems, 2011 edition.
NFPA 17, Standard for Dry Chemical Extinguishing Systems, 2009 edition.
NFPA 20, Standard for the Installation of Stationary Pumps for Fire Protection, 2010 edition.
NFPA 22, Standard for Water Tanks for Private Fire Protection, 2008 edition.
NFPA 24, Standard for the Installation of Private Fire Service Mains and TheirAppurtenances, 2010 edition.
NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, 2011 edition.
NFPA 30, Flammable and Combustible Liquids Code, 2012 edition.
NFPA 45, Standard on Fire Protection for Laboratories Using Chemicals,2011 edition.NFPA 51B, Standard for Fire Prevention During Welding, Cutting, and Other Hot Work, 2009 edition.
NFPA 54, National Fuel Gas Code, 2012 edition.
NFPA 56, Standard for fire and explosion prevention during cleaning and purging of flammable gas piping systems
NFPA 61, Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food Processing Facilities, 2008 edition.
NFPA 68, Standard on Explosion Protection by Deflagration Venting, 2007 edition.
NFPA 69, Standard on Explosion Prevention Systems, 2008 edition.
NFPA 70® , National Electrical Code®, 2011 edition.
NFPA 70E® , Standard for Electrical Safety in the Workplace®, 2012 edition.
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NFPA 72® , National Fire Alarm and Signaling Code, 2010 edition.
NFPA 82, Standard on Incinerators and Waste and Linen Handling Systems and Equipment, 2009 edition.
NFPA 85, Boiler and Combustion Systems Hazards Code, 2011 edition.
NFPA 90A, Standard for the Installation of Air-Conditioning and Ventilating Systems, 2012 edition.NFPA 91, Standard for Exhaust Systems for Air Conveying of Vapors, Gases, Mists, and Noncombustible Particulate Solids, 2010 edition.
NFPA 101® , Life Safety Code®, 2012 edition.
NFPA 204, Standard for Smoke and Heat Venting, 2012 edition.
NFPA 241, Standard for Safeguarding Construction, Alteration, and Demolition Operations, 2009 edition.
NFPA 251, Standard Method of Tests Fire Resistance of Building Construction and Material, 2006 edition.
NFPA 259, Standard Test Method for Potential Heat of Building Materials,2008 edition.
NFPA 496, Standard for Purged and Pressurized Enclosures for Electrical Equipment, 2008 edition.
NFPA 497, Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2008 edition.
NFPA 499, Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2008 edition.
NFPA 600, Standard on Industrial Fire Brigades, 2010 edition.
NFPA 601, Standard for Security Services in Fire Loss Prevention, 2010 edition.
NFPA 654, Standard for the Prevention of Fire and Dust Explosions from the Manufacturing, Processing, and Handling of Combustible Particulate Solids,2006 edition.
NFPA 780, Standard for the Installation of Lightning Protection Systems, 2011 edition.
NFPA 1142, Standard on Water Supplies for Suburban and Rural FireFighting, 2012 edition.
NFPA 2001, Standard on Clean Agent Fire Extinguishing Systems, 2012edition.
Statement of Problem and Substantiation for Public Input
NFPA 56 has relevance to this standard
Submitter Information Verification
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Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City:State: Zip: Submittal Date: Thu Jul 04 18:51:45 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 34-NFPA 820-2013 [ Section No. 2.2 ]
2.2 NFPA Publications.National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169-7471.
NFPA 10, Standard for Portable Fire Extinguishers, 2010 edition.
NFPA 11, Standard for Low-, Medium-, and High-Expansion Foam, 2010 edition.
NFPA 12, Standard on Carbon Dioxide Extinguishing Systems, 2011 edition.
NFPA 12A, Standard on Halon 1301 Fire Extinguishing Systems, 2009 edition.
NFPA 13, Standard for the Installation of Sprinkler Systems, 2010 edition.
NFPA 14, Standard for the Installation of Standpipe and Hose Systems, 2010 edition. NFPA 15, Standard for Water Spray Fixed Systems for Fire Protection, 2012 edition.
NFPA 16, Standard for the Installation of Foam-Water Sprinkler and Foam-Water Spray Systems, 2011 edition.
NFPA 17, Standard for Dry Chemical Extinguishing Systems, 2009 edition.
NFPA 20, Standard for the Installation of Stationary Pumps for Fire Protection, 2010 edition.
NFPA 22, Standard for Water Tanks for Private Fire Protection, 2008 edition.
NFPA 24, Standard for the Installation of Private Fire Service Mains and Their Appurtenances, 2010 edition.
NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems, 2011 edition.
NFPA 30, Flammable and Combustible Liquids Code, 2012 edition.
NFPA 45, Standard on Fire Protection for Laboratories Using Chemicals, 2011 edition.
NFPA 51B, Standard for Fire Prevention During Welding, Cutting, and Other Hot Work, 2009 edition.
NFPA 54, National Fuel Gas Code, 2012 edition. NFPA 61, Standard for the Prevention of Fires and Dust Explosions in Agricultural and Food Processing Facilities, 2008 edition.
NFPA 68, Standard on Explosion Protection by Deflagration Venting, 2007 edition.
NFPA 69, Standard on Explosion Prevention Systems, 2008 edition.
NFPA 70®, National Electrical Code®, 2011 edition.
NFPA 70E®, Standard for Electrical Safety in the Workplace®, 2012 edition.
NFPA 72®, National Fire Alarm and Signaling Code, 2010 edition.
NFPA 82, Standard on Incinerators and Waste and Linen Handling Systems andEquipment, 2009 edition.
NFPA 85, Boiler and Combustion Systems Hazards Code, 2011 edition.
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NFPA 90A, Standard for the Installation of Air-Conditioning and VentilatingSystems, 2012 edition.
NFPA 91, Standard for Exhaust Systems for Air Conveying of Vapors, Gases,Mists, and Noncombustible Particulate Solids, 2010 edition.
NFPA 101®, Life Safety Code®, 2012 edition.
NFPA 204, Standard for Smoke and Heat Venting, 2012 edition. NFPA 241, Standard for Safeguarding Construction, Alteration, and DemolitionOperations, 2009 edition.
NFPA 251, Standard Method of Tests Fire Resistance of Building Construction and Material, 2006 edition.
NFPA 259, Standard Test Method for Potential Heat of Building Materials, 2008 edition.
NFPA 496, Standard for Purged and Pressurized Enclosures for ElectricalEquipment, 2008 edition.
NFPA 497, Recommended Practice for the Classification of Flammable Liquids,Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2008 edition.
NFPA 499, Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas, 2008 edition.
NFPA 600, Standard on Industrial Fire Brigades, 2010 edition.
NFPA 601, Standard for Security Services in Fire Loss Prevention, 2010 edition.
NFPA 654, Standard for the Prevention of Fire and Dust Explosions from theManufacturing, Processing, and Handling of Combustible Particulate Solids, 2006 edition. NFPA 780, Standard for the Installation of Lightning Protection Systems, 2011 edition.
NFPA 1142, Standard on Water Supplies for Suburban and Rural Fire Fighting,2012 edition.
NFPA 2001, Standard on Clean Agent Fire Extinguishing Systems, 2012 edition.
Statement of Problem and Substantiation for Public Input
mmm
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City:State: Zip: Submittal Date: Thu Jul 04 18:54:04 EDT 2013
Copyright Assignment
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I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 38-NFPA 820-2013 [ Section No. 2.3.1 ]
2.3.1 ASTM Publications.ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.
ASTM E 108, Standard Test Methods for Fire Tests of Roof Coverings, 2010 2011 .
IEEE/ASTM SI 10, Use of the International System of Units (SI): the Modern Metric System, 1997.
Statement of Problem and Substantiation for Public Input
date update
Submitter Information Verification
Submitter Full Name: Marcelo HirschlerOrganization: GBH InternationalStreet Address:City: State: Zip:Submittal Date: Sat Jul 06 19:27:26 EDT 2013
Copyright Assignment
I, Marcelo Hirschler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Marcelo Hirschler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 36-NFPA 820-2013 [ Section No. 3.3.32.2 ]
3.3.32.2* Fuel Gas.A gas used as a fuel source, including natural gas, manufactured gas, sludge gas, liquefied petroleum gas–air mixtures, liquefied petroleum gas in the vapor phase, and mixtures of these gases.
Statement of Problem and Substantiation for Public Input
You should consider harmonizing this definition with that used in NFPA 54, 3.3.5.1
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City:State: Zip: Submittal Date: Thu Jul 04 19:04:51 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 46-NFPA 820-2013 [ Section No. 3.3.42 ]
3.3.42 Material.3.3.42.1 Limited-Combustible ( Material) . Refers to a building construction material not complying with the definition of noncombustible material that, in (See 8.2.2)
3.3.42.2 Noncombustible (Material). (See 8.2.1)8.2 Combustibility of materials
8.2.1 Noncombustible Material.8.2.1.1 A material that complies with any of the following shall be considered a noncombustible material:(1)*A material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected to fire or heat(2) A material that is reported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750 Degrees C(3) A material that is reported as complying with the pass/fail criteria of ASTM E 136 when tested in accordance with the test method and procedure in ASTM E 2652, Standard Test Method for Behavior of Materials in a Tube Furnace with a Cone-shaped Airflow Stabilizer, at 750 Degrees C8.2.1.2 Where the term limited-combustible is used in this Code , it shall also include the term noncombustible .8.2.2* Limited-Combustible Material. A material shall be considered a limited-combustible material where all the conditions of 8.2.2.1 and 8.2.2.2, and the conditions of either 8.2.1.3 or8.2.1.4, are met.8.2.2.1 The material shall not comply with the requirements for noncombustible material in accordance with 8.2.1.8.2.2.2 The material, in the form in which it is used,
hasshall exhibit a potential heat value not exceeding 3500 Btu/lb ( 8141 kJ/kg(3500 Btu/lb),where tested in accordance with NFPA 259and includes (1) materials having a , Standard Test Method for Potential Heat of Building Materials .8.2.2.3 The material shall have the structural base of a noncombustible material , with a surfacing not exceeding a thickness of
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1 ⁄ 81⁄8 in. (3.2 mm) that haswhere the surfacing exhibits a flame spread index not greater than 50 ; and (2) materialswhen tested in accordance with ASTM E 84, Standard Test Method for Surface Burning Characteristics of Building Materials , or ANSI/UL 723, Standard for Test for Surface Burning Characteristicsof Building Materials .8.2.2.4 The material shall be composed of materials that , in the form and thickness used, other than as described in (1), having neitherneither exhibit a flame spread index greater than 25 nor evidence of continued progressive combustion when tested in accordance with ASTM E 84 , Standard Test Method for Surface Burning Characteristics of Building Materials, or ANSI/UL 723, Standard for Test for Surface Burning Characteristics of Building Materials,and shall be of such composition that all surfaces that would be exposed by cutting through the material on any plane wouldhave neither exhibit a flame spread index greater than 25 nor exhibit evidence of continued progressive combustion when tested in accordance with ASTM E 84 or ANSI/UL 723 .38 .32 .42.2 * Noncombustible Material.In wastewater treatment facilities, a material that, in the form in which it is used and under the conditions anticipated, will not ignite, burn, support combustion, or release flammable vapors when subjected tofire or heat.2.5 Where the term limited-combustible is used in this Code , itshall also include the term noncombustible .A.8.2.1 The provisions of 4.6.13 do not require inherently noncombustible materials to be tested in order to be classified as noncombustible materials.A.8.2.1.1(1) Examples of such materials include steel, concrete,masonry, and glass.A.8.2.2 Materials subject to increase in combustibility or flame spread index beyond the limits herein established through the effects of age, moisture, or other atmospheric condition are considered combustible. (See NFPA 259, Standard Test Method for Potential Heat of Building Materials , and NFPA 220, Standard on Types ofBuilding Construction .)Also, add references to ASTM E136 (2012), ASTM E2652 (2012) and NFPA 259 into chapter 2Also renumber sections 8.2 and subsequent ones
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Statement of Problem and Substantiation for Public Input
NFPA 5000 (and NFPA 1 and NFPA 101) have updated the definitions of noncombustible materials and limited combustible material and the proposed text is an extract from there.
Submitter Information Verification
Submitter Full Name: Marcelo HirschlerOrganization: GBH InternationalStreet Address: City:State: Zip: Submittal Date: Sat Jul 06 20:01:13 EDT 2013
Copyright Assignment
I, Marcelo Hirschler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Marcelo Hirschler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 37-NFPA 820-2013 [ Section No. 3.3.47 ]
3.3.47* Physically Separated.A gastight partition between two adjacent spaces, or two nonadjacent spaces, with no means of gas communication between the spaces.
Statement of Problem and Substantiation for Public Input
I withdraw my earlier comment about defining physically separated. I did not remember the definition here. I do however wonder how one knows that the separation is gas tight after some number of years of service?
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City:State: Zip: Submittal Date: Thu Jul 04 19:08:28 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 40-NFPA 820-2013 [ Section No. 3.3.50 ]
3.3.50 Rating.3.3.50.1 Fire Resistance Rating.The time, in minutes or hours, that materials or assemblies have withstood a fire exposure as established in accordance with the test procedures of NFPA 251. [ 220 , 2012] determined by the tests, or methods based on tests, prescribed by this standard.3.3.
50.225 * Low FlameSpread Rating.A flame spread rating of 25 or less.spread index. A number obtained according to ASTM E 84, Standard Test Method for Surface Burning Characteristics of Building Materials, or ANSI/UL 723, Standard for Test for Surface Burning Characteristics of Building Materials. [NFPA 220]
A.3.3.25 A flame spread index of 25 or less (LFS) is a flame spread index for a Class A material in accordance with ASTM E84 and is generally considered a low flame spread index.
Also renumber definitions starting in 3.3.25
Statement of Problem and Substantiation for Public Input
1. Fire resistance rating (formerly determined in accordance with NFPA 251, now withdrawn) is normally determined in accordance with ASTM E119. However modern NFPA definitions (including in NFPA 5000) just refer to a generic test method. Alternately the reference to NFPA 251 could be replaced by a reference to ASTM E119, as it is the replacement for NFPA 251.
2. Flame spread rating has now been replaced as a term by flame spread index. The NFPA 220 definition of flame spread index is recommended for use instead of that now in NFPA 820. There is nothing in ASTM E84 about flame spread rating or about what is a low flame spread rating.
3. A corresponding change is also made elsewhere.
Submitter Information Verification
Submitter Full Name: Marcelo HirschlerOrganization: GBH InternationalStreet Address: City:State: Zip: Submittal Date: Sat Jul 06 19:31:30 EDT 2013
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Copyright Assignment
I, Marcelo Hirschler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Marcelo Hirschler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 23-NFPA 820-2013 [ Section No. 3.3.54.5 ]
3.3.54.5 Industrial Sewer.A sewer intended to receive only industrial wastewater or other liquid or water-carried wastes. (See also 3.3.54.12, Sanitary Sewer; 3.3.54.13, Storm Sewer; and 3.3.54.4, Combined Sewer.)
3.3.54.5 Industrial Sewer.
A sewer that is intended to recieve only industrial wastewater, or other liquid, or other water-carried wastes. e.g., Is located on private properity, is owned and operated to carry industry specific contaninanents, and is properly treated to federal and state requirements before direct discharged or receives proper pre-treatment in accordance with federal or state requirements before discharge to a municipal sewer system.
Statement of Problem and Substantiation for Public Input
There is confussion about the the reason for excluding induxtrial sewers for the document in section 1.1.3.5.
Submitter Information Verification
Submitter Full Name: James WheelerOrganization: US Environmental Protection AgStreet Address: City: State:Zip: Submittal Date: Wed Jul 03 14:40:54 EDT 2013
Copyright Assignment
I, James Wheeler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am James Wheeler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 47-NFPA 820-2013 [ Section No. 3.3.54.11 ]
3.3.54.11 Residential Sewer.A sewer intended to receive only residential wastewater. (See also 3.3.54.4, Combined Sewer; 3.3.54.12, Sanitary Sewer; and 3.3.54.13, Storm Sewer.)
3.3.54.11 Residential Sewer: A sewer intended to receive only residential domestic wastewater. (see also 3.3.54.4, combined sewer ; 3.3.54.12, sanitary sewer; and3.3.54.13 Storm Sewer ,
Statement of Problem and Substantiation for Public Input
Confussion about the defination of an individual sewer.
Submitter Information Verification
Submitter Full Name: James WheelerOrganization: US Environmental Protection AgStreet Address: City: State:Zip: Submittal Date: Mon Jul 08 08:56:04 EDT 2013
Copyright Assignment
I, James Wheeler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am James Wheeler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 51-NFPA 820-2013 [ New Section after 3.3.61 ]
Supervising StationA constantly attended location. Upon receipt of CGD / Ventilation Failure / Pressurization Failure alarm signals, Supervising Station personnel shall perform the following actions in the order listed;(1) Where required by the emergency response agency, immediately retransmit indication of the alarm signal.(2) Contact the responsible party(s) in accordance with the notification plan.
Statement of Problem and Substantiation for Public Input
Clarification regarding 7.5.4 reference to supervised signaling systems as set forth in NFPA 72.
Submitter Information Verification
Submitter Full Name: CHARLES OLAHOrganization: EMA CANADAStreet Address: City:State: Zip: Submittal Date: Mon Jul 08 16:14:48 EDT 2013
Copyright Assignment
I, CHARLES OLAH, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am CHARLES OLAH, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 3-NFPA 820-2013 [ Section No. 4.2 ]
4.2* Design and Construction. The design and construction of collection system facilities shall conform to Table 4.2, which summarizes the various components associated with wastewater collection and transport systems.Table 4.2 Collection Systems
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC -Area Electrical
Classification (All Class I, Group D)
MCofo
S
1
MATERIALS USED IN REHABILITATION, RECONSTRUCTION, OR SLIP-LINING OF SEWERS
NA NA NA NA In wit
2
INDUSTRIAL SEWER Sewer transporting industrial wastewater only (no sanitary wastewater)
Not included within the scope of this sta
3
STORM SEWER
Sewer transporting storm water only (no sanitary wastewater)
Possible ignition of flammable gases and floating flammableliquids
NNV Inside of sewer Division 2 In
wit
4
STORM WATER PUMPING STATION WET WELLS
Liquid side of pumping station serving only a storm sewer system
Possible ignition of flammable gases and floating flammableliquids
NNV Entire room or space Division 2 NC
LF
5a
STORM WATER PUMPING STATION DRY WELLS
Dry side of a pumping station serving only a storm sewer system andphysically separated from wet well
Buildup of vapors from flammable or combustibleliquids
D Entire dry well
Division 2, or unclassified, if space provided withpressurization in accordance with NFPA 496
NCLF
b C Unclassified
6
PRESSURE SEWER (Force main) Sewer under pressure (flooded discharge pipe from pump or tank)
Not included within the scope of this sta
7
BUILDING SEWER (Lateral sewer or drain) Sewer serving a house or single building (plumbing)
Not included within the scope of this sta
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC -Area Electrical
Classification (All Class I, Group D)
MCofo
S
8
INDIVIDUAL RESIDENTIAL SEWER
Sewer serving one but not more than five dwellings
NA NNVWithin enclosed space
Unclassified NR
9
INDIVIDUAL RESIDENTIAL PUMPING UNITS
Pumping units serving one but not more than five dwellings (e.g.,grinder pumps, septic tank effluent pumps, ejector pumps)
NA NNVWithin enclosed space
Unclassified NR
10
a RESIDENTIAL SEWER
Sewer transporting primarily residential wastewater
Possible ignition of flammable gases and floatingflammable liquids
NNVWithin enclosed space
Division 2In wit
b B Unclassified
11 a
RESIDENTIAL WASTEWATER PUMPING STATION WET WELL
Pumping station transporting primarily residential wastewater
Possible ignition offlammable gases and floating flammable liquids
A Entire room or space Division 2 NC
LF
b B Unclassified
12 a
RESIDENTIAL WASTEWATER PUMPING STATION DRY WELL
Dry side of a pumping station transporting primarily residentialwastewater
Buildup of vapors from flammable or combustible liquids
D Entire room or space Division 2 NC
LF
b C Unclassified
13
OUTFALL SEWER Final discharge pipe from a treatment plant, transporting treated wastewater
NA NNV NA Unclassified NR
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC -Area Electrical
Classification (All Class I, Group D)
MCofo
S
14 a
SANITARY SEWER Sewer transporting domestic, commercial, andindustrial wastewater
Possible ignition of flammable gases and floating flammableliquids
NNV Inside of sewer Division 1 In
wit
b B Division 2
15 a
COMBINED SEWER Sewer transporting domestic, commercial, andindustrial wastewater and storm water
Possible ignition offlammable gases and floating flammable liquids
NNV Inside of sewer Division 1 In
wit
b B Division 2
16 a
WASTEWATER PUMPING STATION WET WELLS
Liquid side of a pumping station serving a sanitary sewer or combined system
Possible ignition of flammable gases and floating flammableliquids
A Entire room or space Division 1 NC
LF
b B Division 2
17 a
BELOWGRADE OR PARTIALLY BELOWGRADE WASTEWATER PUMPING STATIONDRY WELL
Pump room physically separated from wet well; pumping of wastewater from a sanitary or combined sewer system through closed pumps and pipes
Buildup ofvapors from flammable or combustible liquids
C Entire space or room Unclassified NC
LF
b D
Division 2, or unclassified, if space provided withpressurization in accordance with NFPA 496
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC -Area Electrical
Classification (All Class I, Group D)
MCofo
S
18
ABOVEGRADE WASTEWATER PUMPING STATION Pump room physically separated with no personnel access to wet well; pumping of wastewater from a sanitary or combined sewer system through closed pumps and pipes
NA NR NA Unclassified NCLF
19 a
ABOVEGRADE WASTEWATER PUMPING STATION Pump room not physically separated from wet well; pumping of wastewater from a sanitary or combinedsewer system through closed pumps and pipes
Possible ignition offlammable gases and floating flammable liquids
A Entire space or room Division 1 NC
b B Division 2 NCLF
20 a
ODOR-CONTROL SYSTEM AREAS
Areas physically separated from wet well and housing systems handling wet well gases
Leakage and ignition of flammable gases
D Entire area if enclosed Division 2 NC
LF
b C, or outdoors
Areas within 0.9 m (3 ft) of leakage sources such as fans,dampers, flexible connections, flanges, pressurized unwelded ductwork, and odor-control vessels
Division 2
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC -Area Electrical
Classification (All Class I, Group D)
MCofo
S
cAreas beyond 0.9 m (3 ft)
Unclassified
21 a
MAINTENANCE HOLES
Access to sewer for personnel entry
Possible ignition offlammable gases and floating flammable liquids
NNV Inside Division 1 In wit
b B Division 2
22 a
JUNCTION CHAMBERS
Structure where sewers intersect
Buildup of vapors fromflammable or combustible liquids
NNV Inside Division 1 In wit
b B
Open and above grade or inside and ventilated
Division 2
23INVERTED SIPHONS Depressed section of gravity sewer
Possible ignition of flammable gases and floating flammableliquids
NNVInterior of inlet and outlet structures
Division 1 NC
24
CATCH BASINS (Curb inlet) Inlet where street water enters a storm or combined sewer
Buildup of vapors from flammable or combustible liquids
NNV Enclosed space Division 1 In
wit
25 a
RESIDENTIAL DIVERSION STRUCTURES
Enclosed structures where residential wastewater can bediverted
Buildup of vapors from flammable or combustible liquids
NNV Enclosed space Division 2 In
wit
b B Unclassified
26 a
RESIDENTIAL BELOWGRADE VALVE VAULT
With an exposed residential wastewater surface
Possible ignition ofgases and floating flammable liquids
NNV Enclosed space Division 2 In
wit
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC -Area Electrical
Classification (All Class I, Group D)
MCofo
Sb B Unclassified
27 a
RESIDENTIAL CONTROL STRUCTURES Enclosed structures where residential wastewater flow is regulated
Buildup of vapors fromflammable or combustible liquids
A Enclosed space Division 2 In
wit
b B Unclassified
28 a
RESIDENTIAL BELOWGRADE METERING VAULT
With an exposed residential wastewater surface
Possible ignition offlammable gases and floating flammable liquids
NNV Enclosed space Division 2 In
wit
b B Unclassified
29 a
DIVERSION STRUCTURES
Enclosed structures where wastewater can be diverted
Buildup of vapors fromflammable or combustible liquids
NNV Enclosed space Division 1 In
wit
b B Division 2
30
ABOVEGRADE VALVE VAULT
Physically separated from the wet well; valves in vault in closed piping system
NA NR NA Unclassified NCLF
31 a
BELOWGRADE VALVE VAULT
Physically separated from the wet well and with closed pipingsystem
Buildup of vapors from flammable or combustible liquids
NNV Enclosed space Division 2 NC
LF
b C Unclassified
32 a
BELOWGRADE VALVE VAULT
With an exposed wastewater surface
Possible ignition ofgases and floating flammable liquids
NNV Enclosed space Division 1 NC
b B Division 2 NCLF
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC -Area Electrical
Classification (All Class I, Group D)
MCofo
S
33 a
CONTROL STRUCTURES
Enclosed structures where wastewater or storm water flow isregulated
Buildup of vapors from flammable or combustible liquids
A Enclosed space Division 1 In
wit
b B Division 2
34 a
WASTEWATER HOLDING BASINS Enclosed structures temporarily holding untreated or partially treated wastewater
Possible ignition offlammable gases and floating flammable liquids
A Enclosed space Division 1 NC
b B Division 2 NCLF
35
WASTEWATER HOLDING BASINS, LINED OR UNLINED Open structuresholding storm water, combined wastewater, untreated or partially treated wastewater
NR NR NR NR NR
36 a
BELOWGRADE METERING VAULT Physically separated from the wet well and with closed piping system
Buildup of vapors fromflammable or combustible liquids
NNV Enclosed space Division 2 NC
LF
b C Unclassified
37 a
BELOWGRADE METERING VAULT
With an exposed wastewater surface
Possible ignition offlammable gases and floating flammable liquids
NNV Enclosed space Division 1 NC
b B Division 2 NCLF
38
COARSE AND FINE SCREEN FACILITIES (See Coarse and Fine Screen Facilities inTable 5.2.)
Notes:
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(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to specific figures in A.4.2 and specific requirements for each location and function.
(3) The following codes are used in this table:A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9.1.2.
C: Continuously ventilated at six 6 air changes per hour or in accordance with Chapter 9.1.2.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FDS: Fire detection system.
FE: Portable fire extinguisher.LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.
NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NNV: Not normally ventilated.
NR: No requirement.
Additional Proposed Changes
File Name Description Approved820_Rainville_4_820-2008.pdf Cover Sheet
Statement of Problem and Substantiation for Public Input
Per 9.1.1.4, ventilation requirements not addressed by Chapters 4, 5, and 6 shall meet the requirements of 9.1.1.4. If I correctly understand that the requirements of Section 9.3, Ventilation Criteria apply only to Table 9.1.1.4 then the only alternative requirements in Chapter 9 as implied by the current text "or in accordance with Chapter 9" in the Notes of Tables 4.2, 5.2, and 6.2(a) would appear to be Section 9.1.2. Proposed change will avoid confusion and misapplication of Section 9.3 to the requirements of Table 4.2, 5.2, and 6.2(a).
Submitter Information Verification
Submitter Full Name: Charles RainvilleOrganization: Hallam-ICSStreet Address: City:State: Zip: Submittal Date: Tue Feb 19 11:36:10 EST 2013
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Copyright Assignment
I, Charles Rainville, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Charles Rainville, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 48-NFPA 820-2013 [ Section No. 4.2 ]
4.2* Design and Construction.The design and construction of collection system facilities shall conform to Table4.2, which summarizes the various components associated with wastewatercollection and transport systems.Table 4.2 Collection Systems
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Row LineLocation
and Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC-Area Electrical
Classification (All Class I, Group D)
MateriaConstrufor Build
orStructu
1
MATERIALS USED IN REHABILITATION, RECONSTRUCTION,OR SLIP-LINING OF SEWERS
NA NA NA NA In accordwith 8.3.1
2
INDUSTRIAL SEWER Sewer transporting industrialwastewater only (no sanitary wastewater)
Not included within the scope of this standard
3
STORM SEWER Sewer transporting storm water only (no sanitary wastewater)
Possible ignition of flammable gases and floatingflammable liquids
NNV Inside of sewer Division 2 In accord
with 8.3.1
4
STORM WATER PUMPING STATION WET WELLS Liquid side of pumping station serving only a storm sewer system
Possible ignition of flammable gases and floatingflammable liquids
NNV Entire room or space Division 2 NC, LC, o
LFS
5a
STORM WATER PUMPING STATION DRY WELLS Dry side of a pumping station serving only a storm sewer system andphysically separated from wet well
Buildup of vapors from flammable orcombustible liquids
D Entire dry well
Division 2, or unclassified, if space providedwith pressurization in accordance with NFPA 496
NC, LC, oLFS
b C Unclassified
6
PRESSURE SEWER (Force main) Sewer under pressure(flooded discharge pipe from pump or tank)
Not included within the scope of this standard
7
BUILDING SEWER (Lateral sewer or drain) Sewer serving a house or single building (plumbing)
Not included within the scope of this standard
8
INDIVIDUAL RESIDENTIAL SEWER Sewer serving one but not more than five dwellings
NA NNVWithin enclosed space
Unclassified NR
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Row LineLocation
and Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC-Area Electrical
Classification (All Class I, Group D)
MateriaConstrufor Build
orStructu
9
INDIVIDUAL RESIDENTIAL PUMPING UNITS Pumping units serving one but not more than five dwellings (e.g.,grinder pumps, septic tank effluent pumps, ejector pumps)
NA NNVWithin enclosed space
Unclassified NR
10
a RESIDENTIAL SEWER Sewer transporting primarily residential wastewater
Possible ignition of flammable gases and floating flammable liquids
NNVWithin enclosed space
Division 2In accordwith 8.3.1
b B Unclassified
11 a
RESIDENTIAL WASTEWATER PUMPING STATION WET WELL Pumping station transporting primarily residential wastewater
Possibleignition of flammable gases and floating flammable liquids
A Entire room or space Division 2 NC, LC, o
LFS
b B Unclassified
12 a
RESIDENTIAL WASTEWATER PUMPING STATION DRY WELL Dry side of a pumping station transporting primarily residentialwastewater
Buildup of vapors from flammable or combustible liquids
D Entire room or space Division 2 NC, LC, o
LFS
b C Unclassified
13
OUTFALL SEWER Final discharge pipe from a treatment plant, transporting treated wastewater
NA NNV NA Unclassified NR
14 a
SANITARY SEWER Sewer transporting domestic,commercial, and industrial wastewater
Possibleignition of flammable gases and floating flammable liquids
NNV Inside of sewer Division 1 In accord
with 8.3.1
b B Division 2
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Row LineLocation
and Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC-Area Electrical
Classification (All Class I, Group D)
MateriaConstrufor Build
orStructu
15 a
COMBINED SEWER Sewer transporting domestic,commercial, and industrial wastewater and storm water
Possibleignition of flammable gases and floating flammable liquids
NNV Inside of sewer Division 1 In accord
with 8.3.1
b B Division 2
16 a
WASTEWATER PUMPING STATION WET WELLS Liquid side of a pumping station serving a sanitary sewer or combined system
Possible ignition of flammable gases andfloating flammable liquids
A Entire room or space Division 1 NC, LC, o
LFS
b B Division 2
17 a
BELOWGRADE OR PARTIALLY BELOWGRADE WASTEWATERPUMPING STATION DRY WELL Pump room physically separated from wet well; pumping of wastewater from a sanitary or combined sewer system through closed pumps and pipes
Buildup of vapors from flammable or combustible liquids
C Entire space or room Unclassified NC, LC, o
LFS
b D
Division 2, or unclassified, if space providedwith pressurization in accordance with NFPA 496
18
ABOVEGRADE WASTEWATER PUMPING STATION Pump roomphysically separated with no personnel access to wet well; pumping ofwastewater from a sanitary or combined sewer system through closed pumps and pipes
NA NR NA Unclassified NC, LC, oLFS
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Row LineLocation
and Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC-Area Electrical
Classification (All Class I, Group D)
MateriaConstrufor Build
orStructu
19 a
ABOVEGRADE WASTEWATER PUMPING STATION Pump room not physically separated from wet well; pumping of wastewater from asanitary or combined sewer system through closed pumps and pipes
Possibleignition of flammable gases and floating flammable liquids
A Entire space or room Division 1 NC
b B Division 2 NC, LC, oLFS
20 a
ODOR-CONTROL SYSTEM AREAS Areas physically separated from wet well and housing systems handling wet well gases
Leakage and ignition of flammable gases
D Entire area if enclosed Division 2 NC, LC, o
LFS
b C, or outdoors
Areas within 0.9 m (3 ft) of leakage sourcessuch as fans, dampers, flexible connections, flanges, pressurized unweldedductwork, and odor-control vessels
Division 2
cAreas beyond 0.9 m (3 ft)
Unclassified
21 a
MAINTENANCE HOLES Access to sewer for personnel entry
Possibleignition of flammable gases and floating flammable liquids
NNV Inside Division 1 In accordwith 8.3.1
b B Division 2
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Row LineLocation
and Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC-Area Electrical
Classification (All Class I, Group D)
MateriaConstrufor Build
orStructu
22 a
JUNCTION CHAMBERS Structure where sewers intersect
Buildup of vapors from flammable or combustible liquids
NNV Inside Division 1 In accordwith 8.3.1
b B
Open and above grade or inside andventilated
Division 2
23
INVERTED SIPHONS Depressed section of gravitysewer
Possible ignition of flammable gases andfloating flammable liquids
NNV
Interior of inlet and outlet structures
Division 1 NC
24
CATCH BASINS (Curb inlet) Inlet where street water enters a storm or combined sewer
Buildup of vapors from flammable or combustibleliquids
NNV Enclosed space Division 1 In accord
with 8.3.1
25 a
RESIDENTIAL DIVERSION STRUCTURES Enclosed structures where residential wastewater can bediverted
Buildup of vapors from flammable or combustible liquids
NNV Enclosed space Division 2 In accord
with Cha
b B Unclassified
26 a
RESIDENTIAL BELOWGRADE VALVE VAULT With an exposed residential wastewater surface
Possibleignition of gases and floating flammable liquids
NNV Enclosed space Division 2 In accord
with 8.3.1
b B Unclassified
27 a
RESIDENTIAL CONTROL STRUCTURES Enclosed structures where residential wastewater flow is regulated
Buildup of vapors from flammable or combustible liquids
A Enclosed space Division 2 In accord
with Cha
b B Unclassified
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Row LineLocation
and Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC-Area Electrical
Classification (All Class I, Group D)
MateriaConstrufor Build
orStructu
28 a
RESIDENTIAL BELOWGRADE METERING VAULT With an exposed residential wastewater surface
Possibleignition of flammable gases and floating flammable liquids
NNV Enclosed space Division 2 In accord
with 8.3.1
b B Unclassified
29 a
DIVERSION STRUCTURES Enclosed structures where wastewater can be diverted
Buildup of vapors from flammable or combustible liquids
NNV Enclosed space Division 1 In accord
with Cha
b B Division 2
30
ABOVEGRADE VALVE VAULT Physically separated from the wet well; valves in vault in closed piping system
NA NR NA Unclassified NC, LC, oLFS
31 a
BELOWGRADE VALVE VAULT Physically separated from the wet well and with closed pipingsystem
Buildup of vapors from flammable or combustible liquids
NNV Enclosed space Division 2 NC, LC, o
LFS
b C Unclassified
32 a
BELOWGRADE VALVE VAULT With an exposed wastewater surface
Possibleignition of gases and floating flammable liquids
NNV Enclosed space Division 1 NC
b B Division 2 NC, LC, oLFS
33 a
CONTROL STRUCTURES Enclosed structures where wastewater or storm water flow isregulated
Buildup of vapors from flammable or combustible liquids
A Enclosed space Division 1 In accord
with Cha
b B Division 2
34 a
WASTEWATER HOLDING BASINS Enclosed structurestemporarily holding untreated or partially treated wastewater
Possibleignition of flammable gases and floating flammable liquids
A Enclosed space Division 1 NC
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Row LineLocation
and Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area
NEC-Area Electrical
Classification (All Class I, Group D)
MateriaConstrufor Build
orStructu
b B Division 2 NC, LC, oLFS
35
WASTEWATER HOLDING BASINS, LINED OR UNLINED Open structures holding storm water, combined wastewater, untreated or partially treated wastewater
NR NR NR NR NR
36 a
BELOWGRADE METERING VAULT Physically separatedfrom the wet well and with closed piping system
Buildup of vapors from flammable or combustible liquids
NNV Enclosed space Division 2 NC, LC, o
LFS
b C Unclassified
37 a
BELOWGRADE METERING VAULT With an exposed wastewater surface
Possibleignition of flammable gases and floating flammable liquids
NNV Enclosed space Division 1 NC
b B Division 2 NC, LC, oLFS
38
COARSE AND FINE SCREEN FACILITIES (See Coarse and Fine Screen Facilities in Table 5.2.)
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to specific figures in A.4.2 and specific requirements for each location and function.
(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.B: Continuously ventilated at 12 changes per hour or in accordance with Chapter
9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
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FDS: Fire detection system.
FE: Portable fire extinguisher.
LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.
NC: Noncombustible material.NEC: In accordance with NFPA 70.
NNV: Not normally ventilated.
NR: No requirement.
Statement of Problem and Substantiation for Public Input
Table 4.2 Row 8. This is confussing. Chance to: Individual Residentila Sewer Sewer serving one or more individual residences with a total daily flow of not more than 500 gallons per day (gpd).
Table 4.2 Row 9. This is confussing. Change to: Individual Residential Pumping Units Pumping units that serving one or more individual residneces with a total daily flow of not more than 500 gallons per day (gpd).
Submitter Information Verification
Submitter Full Name: James WheelerOrganization: US Environmental Protection AgStreet Address: City: State:Zip: Submittal Date: Mon Jul 08 09:03:53 EDT 2013
Copyright Assignment
I, James Wheeler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am James Wheeler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 11-NFPA 820-2013 [ Section No. 5.2 ]
5.2 * Design and Construction.The design and construction of liquid stream treatment processes shall conform to Table 5.2.Table 5.2 Liquid Stream Treatment Processes
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
1 a
COARSE AND FINE SCREEN FACILITIES
Removal of screenings from raw wastewater
Possibleignition of flammable gases and floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNotenclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel
2
PUMPINGSTATIONS
(See Collection Systems, Table 4.2.)
3 a
FLOWEQUALIZATION TANKS
Storage of raw or partially treated wastewater
Possibleignition of flammable gases and floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNotenclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 2,3
4 a
GRIT REMOVAL TANKS
Separation of grit from raw wastewater
Possibleignition of flammable gases and floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
cNotenclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 2,3
5 a
PRE-AERATIONTANKS
Conditioning of wastewater prior to further treatment
Possibleignition of flammable gases and floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNotenclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 2,3
6 a
PRIMARYSEDIMENTATION TANKS
Separation of floating or settleable solids from raw wastewater
Possibleignition of flammable gases and floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
cNotenclosed, open to atmosphere
Interior of the tank from the minimum operating water surface to the top of the tank wall; envelope 0.46 m (18 in.) above the top of the tank andextending 0.46 m (18 in.) beyond the exterior wall; envelope 0.46 m (18in.) above grade extending 3 m (10 ft) horizontally from the exterior tankwalls
7
AERATION BASIN, POND, LAGOON, OXIDATION DITCH, AEROBIC SUSPENDED GROWTH SYSTEMS,SEQUENCING BATCH REACTORS Aerobic treatment of wastewater open to the atmosphere
NA NR
Classified (see Primary Sedimentation)
Unclassified if process is preceded by primary sedimentation
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
8 a
ENCLOSEDAERATION BASIN, AEROBIC OR SUSPENDED GROWTH SYSTEMS, MEMBRANE BIOLOGICALREACTORS
Aerobic treatment not preceded by primary treatment
Possibleignition of flammable gases or floating flammable liquids
A (Interior of tank)
Entireenclosed space or tank of system
Division 1
Exterior of enclosed space or tank, installed in a building
Division 2
Exterior of enclosed space or tank, installed outdoors; envelope 0.46 m (18 in.)surrounding tank
Division 2
b
B (Interior of tank maintained at negative pressure)
Entireenclosed space or tank of system
Division 2
Exterior of enclosed space or tank, installed in a building
Unclassified
Exterior of enclosed space or tank, installed outdoors
Unclassified
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
cNotenclosed, open to atmosphere
Interior of tank from the minimum operating water surface to the top of the tank wall; envelope 0.46 m (18 in.) above the top of the tank and extending0.46 m (18 in.) beyond exterior wall; envelope 0.46 m (18 in.) above grade and extending 3 m (10 ft) horizontally from the exterior tankwalls
Division 2
d
RESIDENTIALENCLOSED AERATION BASIN, AEROBIC OR SUSPENDED GROWTH SYSTEMS, MEMBRANEBIOLOGICAL REACTORS
Aerobic treatment not preceded by primary treatment, serving one but not more than five dwellings
Possibleignition of flammable gases or floating flammable liquids
A (Interior of tank)
Entireenclosed space or tank of system
Division 2
Exterior of enclosed space or tank, installed in a building
Unclassified
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
Exterior of enclosed space or tank, installedoutdoors
Unclassified
9
ENCLOSEDAERATION BASIN, AEROBIC OR SUSPENDED GROWTH SYSTEMS, MEMBRANE BIOLOGICALREACTORS
Aerobic treatment of wastewater preceded by primary treatment
NA NREntireenclosed space
Unclassified
10
TRICKLINGFILTER, BIO-TOWER, AEROBIC FIXED-FILM SYSTEMS
Aerobic biological treatment of wastewater
Not normally a significant hazard; however, these processes might containmaterials that are combustible under certain conditions
NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primary sedimentation.
11 a
ANAEROBICTOWERS, ANAEROBIC FIXED-FILM SYSTEM
Anaerobic biological treatment if sealed from atmosphere
Normallyproduces combustible gas as treatment process by-product
NA Tank interior Division 1
b3 m (10 ft) envelope around tank
Division 2
12 a
GAS-HANDLINGSYSTEMS FOR LIQUID TREATMENT PROCESSES
Combustiblegas, often under pressure
A Enclosed—entire space Division 1
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
b B Division 2
c
Notenclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment 2
13
OXYGENAERATION TANKS
Tanks for aerobic treatment of wastewater using high-purity oxygen rather than air
Ignition of flammable gases and floating flammable liquids in an oxygen-
enriched environment
NA Enclosedspace
Division 2 (If unitprocess is not preceded by primary sedimentation, see PrimarySedimentation Tanks in Table 5.2 for classification.)
14
INTERMEDIATE,SECONDARY, OR TERTIARY SEDIMENTATION TANKS
Separate floating and settleable solids from wastewater at various treatment stages
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primary sedimentation.
15
FLASH MIXER OR FLOCCULATION TANKS
Tanks for mixing various treatment chemicals with wastewater
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primary sedimentation.
16
NITRIFICATIONAND DENITRIFICATION TANKS
Tertiary treatment of wastewater to reduce or remove nitrogen
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primary sedimentation.
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
17
BREAKPOINTCHLORINATION TANKS AND CHLORINE CONTACT TANKS
Application of chlorine in aqueous solution to wastewater
NA NR NA Unclassified
18AMMONIASTRIPPING TOWERS
(SeeTrickling Filter in Table 5.2.)
NA NA Unclassified
19
INTERMEDIATEOR FINAL PUMPING STATIONS
Pump(s) at intermediate stage or end of the treatment process
NA NR NA Unclassified
20
GRAVITY AND PRESSURE FILTERS
Filtering of treated wastewater through sand or other media
NA NR NA Unclassified
21
CARBON COLUMN OR TANKS
Vessels containing carbon for tertiary treatment of wastewater
Significanthazard from combustible carbon material
NA NA Unclassified
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
22
ON-SITE OZONE GENERATION SYSTEM AND OZONE CONTACT TANKS
Ozone generation and purification for disinfection of wastewater
Similar to oxygen generation with addition of being highly corrosive(see Table D.1.1)
NA NA Not covered in this standard
23
BACKWASHWATER AND WASTE BACKWASH WATER HOLDING TANKS
Tanks for temporary storage of backwash water
NA NA NA Unclassified
24
ULTRAVIOLETDISINFECTION UNIT
Disinfection of wastewater effluent by ultraviolet radiation
NA NR NA Unclassified
25
EFFLUENTSTRUCTURES
Various structures conveying treated wastewater away from treatment processes
NA NR NA Unclassified
26 a
ODOR-CONTROLSYSTEM AREAS
Areas physically separated from processes that house systems handling leakage and ignition of process gases and vapors
Leakage and ignition of flammable gases
D Entire area if enclosed Division 2
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
b C
Areas within 0.9 m (3 ft) of leakage sources such as fans, dampers, flexibleconnections, flanges, pressurized unwelded ductwork, and odor-controlvessels
Division 2
cAreasbeyond 0.9 m (3 ft)
Unclassified
d
Not enclosed, open to atmosphere
Areas within 0.9 m (3 ft) of leakage sources such as fans, dampers, flexible connections, flanges, pressurized unweldedductwork, and odor-control vessels
Division 2
eAreas beyond 0.9 m (3 ft)
Unclassified
f
Odor control systems for processes that do not generate flammable concentrations of gases or vapors
NA NA NA Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to Figure A.5.2 and specific requirements for each location and function.
(3) The following codes are used in this table:
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A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.D: No ventilation or ventilated at less than six air changes per hour.
FE: Portable fire extinguisher.
H: Hydrant protection in accordance with 7.2.4.
LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.
NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NR: No requirement.Footnotes:1Open channels and open structures upstream from the unit processes are classified the same as the downstream processes they supply.2The area beyond the envelope is unclassified.3Where liquid turbulence is not induced by aeration or other factors, the following criteria apply: (1) interior of the tank from the minimum operating water surface to the top of the tank wall; (2) envelope 0.46 m (18 in.) above the top of the tank and extending 0.46 m (18 in.) beyond the exterior wall; (3) envelope 0.46 m (18 in.) above grade extending 3 m (10 ft) horizontally from the exterior tank walls.4These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
Statement of Problem and Substantiation for Public Input
Table 5.2 Row 26Odor control systems may be located outdoors. Line a addresses systems that are enclosed, and it is not clear if line b and c apply only to enclosed systems. The recommendation is to add lines to specifically address outdoor systems. The recommendation is for Division 2 within 3 ft of leakage sources, consistent with existing line b and c.Odor control systems may be connected to processes that do not generate flammable concentrations of gases or vapors, such as aeration tanks or dewatering. Row 26 does not appear to apply to these systems as the descriptions in Row 26 imply that it only applies to systems where ignition of process gases is a hazard. The recommendation is to specifically list that electrical classification is not required for systems where flammable gases of vapors are not generated.
Submitter Information Verification
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Submitter Full Name: TOM BURGESSOrganization: ARCADISStreet Address: City:State: Zip: Submittal Date: Sun Mar 10 11:53:09 EDT 2013
Copyright Assignment
I, TOM BURGESS, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am TOM BURGESS, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 20-NFPA 820-2013 [ Section No. 5.2 ]
5.2 * Design and Construction.The design and construction of liquid stream treatment processes shall conform to Table 5.2.Table 5.2 Liquid Stream Treatment Processes
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
1 a
COARSE AND FINE SCREEN FACILITIES
Removal of screenings from raw wastewater
Possibleignition of flammable gases and floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNotenclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel
2
PUMPINGSTATIONS
(See Collection Systems, Table 4.2.)
3 a
FLOWEQUALIZATION TANKS
Storage of raw or partially treated wastewater
Possibleignition of flammable gases and floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNotenclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 2,3
4 a
GRIT REMOVAL TANKS
Separation of grit from raw wastewater
Possibleignition of flammable gases and floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
cNotenclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 2,3
5 a
PRE-AERATIONTANKS
Conditioning of wastewater prior to further treatment
Possibleignition of flammable gases and floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNotenclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 2,3
6 a
PRIMARYSEDIMENTATION TANKS
Separation of floating or settleable solids from raw wastewater
Possibleignition of flammable gases and floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
cNotenclosed, open to atmosphere
Interior of the tank from the minimum operating water surface to the top of the tank wall; envelope 0.46 m (18 in.) above the top of the tank andextending 0.46 m (18 in.) beyond the exterior wall; envelope 0.46 m (18in.) above grade extending 3 m (10 ft) horizontally from the exterior tankwalls
7
AERATION BASIN, POND, LAGOON, OXIDATION DITCH, AEROBIC SUSPENDED GROWTH SYSTEMS,SEQUENCING BATCH REACTORS Aerobic treatment of wastewater open to the atmosphere
NA NR
Classified (see Primary Sedimentation)
Unclassified if process is preceded by primary sedimentation
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
8 a
ENCLOSEDAERATION BASIN, AEROBIC OR SUSPENDED GROWTH SYSTEMS, MEMBRANE BIOLOGICALREACTORS
Aerobic treatment not preceded by primary treatment
Possibleignition of flammable gases or floating flammable liquids
A (Interior of tank)
Entireenclosed space or tank of system
Division 1
Exterior of enclosed space or tank, installed in a building
Division 2
Exterior of enclosed space or tank, installed outdoors; envelope 0.46 m (18 in.)surrounding tank
Division 2
b
B (Interior of tank maintained at negative pressure)
Entireenclosed space or tank of system
Division 2
Exterior of enclosed space or tank, installed in a building
Unclassified
Exterior of enclosed space or tank, installed outdoors
Unclassified
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
cNotenclosed, open to atmosphere
Interior of tank from the minimum operating water surface to the top of the tank wall; envelope 0.46 m (18 in.) above the top of the tank and extending0.46 m (18 in.) beyond exterior wall; envelope 0.46 m (18 in.) above grade and extending 3 m (10 ft) horizontally from the exterior tankwalls
Division 2
d
RESIDENTIALENCLOSED AERATION BASIN, AEROBIC OR SUSPENDED GROWTH SYSTEMS, MEMBRANEBIOLOGICAL REACTORS
Aerobic treatment not preceded by primary treatment, serving one but not more than five dwellings
Possibleignition of flammable gases or floating flammable liquids
A (Interior of tank)
Entireenclosed space or tank of system
Division 2
Exterior of enclosed space or tank, installed in a building
Unclassified
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
Exterior of enclosed space or tank, installedoutdoors
Unclassified
9
ENCLOSEDAERATION BASIN, AEROBIC OR SUSPENDED GROWTH SYSTEMS, MEMBRANE BIOLOGICALREACTORS
Aerobic treatment of wastewater preceded by primary treatment
NA NREntireenclosed space
Unclassified
10
TRICKLINGFILTER, BIO-TOWER, AEROBIC FIXED-FILM SYSTEMS
Aerobic biological treatment of wastewater
Not normally a significant hazard; however, these processes might containmaterials that are combustible under certain conditions
NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primary sedimentation.
11 a
ANAEROBICTOWERS, ANAEROBIC FIXED-FILM SYSTEM
Anaerobic biological treatment if sealed from atmosphere
Normallyproduces combustible gas as treatment process by-product
NA Tank interior Division 1
b3 m (10 ft) envelope around tank
Division 2
12 a
GAS-HANDLINGSYSTEMS FOR LIQUID TREATMENT PROCESSES
Combustiblegas, often under pressure
A Enclosed—entire space Division 1
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
b B Division 2
c
Notenclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment 2
13
OXYGENAERATION TANKS
Tanks for aerobic treatment of wastewater using high-purity oxygen rather than air
Ignition of flammable gases and floating flammable liquids in an oxygen-
enriched environment
NA Enclosedspace
Division 2 (If unitprocess is not preceded by primary sedimentation, see PrimarySedimentation Tanks in Table 5.2 for classification.)
14
INTERMEDIATE,SECONDARY, OR TERTIARY SEDIMENTATION TANKS
Separate floating and settleable solids from wastewater at various treatment stages
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primary sedimentation.
15
FLASH MIXER OR FLOCCULATION TANKS
Tanks for mixing various treatment chemicals with wastewater
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primary sedimentation.
16
NITRIFICATIONAND DENITRIFICATION TANKS
Tertiary treatment of wastewater to reduce or remove nitrogen
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primary sedimentation.
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
17
BREAKPOINTCHLORINATION TANKS AND CHLORINE CONTACT TANKS
Application of chlorine in aqueous solution to wastewater
NA NR NA Unclassified
18AMMONIASTRIPPING TOWERS
(SeeTrickling Filter in Table 5.2.)
NA NA Unclassified
19
INTERMEDIATEOR FINAL PUMPING STATIONS
Pump(s) at intermediate stage or end of the treatment process
NA NR NA Unclassified
20
GRAVITY AND PRESSURE FILTERS
Filtering of treated wastewater through sand or other media
NA NR NA Unclassified
21
CARBON COLUMN OR TANKS
Vessels containing carbon for tertiary treatment of wastewater
Significanthazard from combustible carbon material
NA NA Unclassified
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area 1
NEC -AreaElectrical
Classification
(All Class I, Group D) 4
22
ON-SITE OZONE GENERATION SYSTEM AND OZONE CONTACT TANKS
Ozone generation and purification for disinfection of wastewater
Similar to oxygen generation with addition of being highly corrosive(see Table D.1.1)
NA NA Not covered in this standard
23
BACKWASHWATER AND WASTE BACKWASH WATER HOLDING TANKS
Tanks for temporary storage of backwash water
NA NA NA Unclassified
24
ULTRAVIOLETDISINFECTION UNIT
Disinfection of wastewater effluent by ultraviolet radiation
NA NR NA Unclassified
25
EFFLUENTSTRUCTURES
Various structures conveying treated wastewater away from treatment processes
NA NR NA Unclassified
26 a
ODOR-CONTROLSYSTEM AREAS
Areas physically separated from processes that house systems handling
leakage exhaust gases from those processes
Leakage and ignition of process gases and vapors
Leakage and ignition of flammable gases
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DEntirearea if enclosed
Division2
NC,LC, or LFS
CGD,FDS, and FE
b C
Areas within 0.9 m (3 ft) of leakage sources such as fans, dampers, flexibleconnections, flanges, pressurized unwelded ductwork, and odor-control vessels
Division 2
c Areas beyond 0.9 m (3 ft) Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to Figure A.5.2 and specific requirements for each location and function.(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FE: Portable fire extinguisher.
H: Hydrant protection in accordance with 7.2.4.LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.
NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NR: No requirement.
Footnotes:1Open channels and open structures upstream from the unit processes are classified the same as the downstream processes they supply.2The area beyond the envelope is unclassified.3Where liquid turbulence is not induced by aeration or other factors, the following criteria apply: (1) interior of the tank from the minimum operating water surface to the top of the tank wall; (2) envelope 0.46 m (18 in.) above the top of the tank and extending 0.46 m (18 in.) beyond the exterior wall; (3) envelope 0.46 m (18 in.) above grade extending 3 m (10 ft) horizontally from the exterior tank walls.4These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
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Statement of Problem and Substantiation for Public Input
The changes are better descriptors for the "Location and Function" and the "Fire and Explosion Hazard" columns.
Submitter Information Verification
Submitter Full Name: RALPH THOMASOrganization: METRO COUNCIL ENVIROMENTAL SVCStreet Address: City: State:Zip: Submittal Date: Tue May 14 15:49:43 EDT 2013
Copyright Assignment
I, RALPH THOMAS, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am RALPH THOMAS, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 4-NFPA 820-2013 [ Section No. 5.2 ]
5.2* Design and Construction. The design and construction of liquid stream treatment processes shall conform to Table 5.2.Table 5.2 Liquid Stream Treatment Processes
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
1 a
COARSE AND FINE SCREEN FACILITIES
Removal of screenings from raw wastewater
Possible ignition offlammable gases and floating flammable liquids
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and openchannel
2
PUMPING STATIONS
(See Collection Systems, Table 4.2.)
3 a
FLOW EQUALIZATION TANKS
Storage of raw or partially treated wastewater
Possible ignition offlammable gases and floating flammable liquids
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and openchannel2,3
4 a
GRIT REMOVAL TANKS
Separation of grit from raw wastewater
Possible ignition offlammable gases and floating flammable liquids
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
c
Not enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and openchannel2,3
5 a
PRE-AERATION TANKS
Conditioning of wastewater prior to further treatment
Possible ignition offlammable gases and floating flammable liquids
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
c
Not enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and openchannel2,3
6 a
PRIMARY SEDIMENTATION TANKS
Separation of floating or settleable solids from rawwastewater
Possible ignition of flammable gases and floating flammableliquids
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
cNot enclosed, open to atmosphere
Interior of the tank from the minimum operating water surface to the top of the tank wall; envelope 0.46 m (18 in.) above the top of the tank and extending 0.46 m (18 in.) beyond the exterior wall; envelope 0.46 m (18 in.) above grade extending 3 m (10 ft) horizontally from theexterior tank walls
7
AERATION BASIN, POND, LAGOON, OXIDATION DITCH, AEROBICSUSPENDED GROWTH SYSTEMS, SEQUENCING BATCH REACTORS Aerobic treatment of wastewater open to the atmosphere
NA NR
Classified (see Primary Sedimentation)
Unclassified if process is preceded by primary sedimentation
NR
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
8 a
ENCLOSED AERATION BASIN, AEROBIC OR SUSPENDED GROWTH SYSTEMS,MEMBRANE BIOLOGICAL REACTORS
Aerobic treatment not preceded by primary treatment
Possible ignition offlammable gases or floating flammable liquids
A (Interior oftank)
Entire enclosed space or tank of system
Division 1 NC
Exterior of enclosed space or tank, installed in abuilding
Division 2 NC, LFS
Exterior of enclosed space or tank, installed outdoors;envelope 0.46 m (18 in.) surrounding tank
Division 2 NC, LFS
b
B (Interior of tankmaintained at negative pressure)
Entire enclosed space or tank of system
Division 2 NC, LFS
Exterior of enclosed space or tank, installed in abuilding
Unclassified NC, LFS
Exterior of enclosed space or tank, installed outdoors
Unclassified NC, LFS
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
c
Not enclosed, open to atmosphere
Interior of tank from the minimum operating water surface tothe top of the tank wall; envelope 0.46 m (18 in.) above the top of the tank and extending 0.46 m (18 in.) beyond exterior wall; envelope 0.46 m (18 in.) above grade and extending 3 m (10 ft) horizontally from theexterior tank walls
Division 2 NC, LFS
d
RESIDENTIAL ENCLOSED AERATION BASIN, AEROBIC OR SUSPENDEDGROWTH SYSTEMS, MEMBRANE BIOLOGICAL REACTORS
Aerobic treatment not preceded by primary treatment, serving one but not more than five dwellings
Possible ignition of flammable gases or floating flammableliquids
A (Interior of tank)
Entire enclosed space or tank of system
Division 2 NC
Exterior of enclosed space or tank, installed in abuilding
Unclassified NC, LFS
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
Exterior of enclosed space or tank, installed outdoors
Unclassified NC, LFS
9
ENCLOSED AERATION BASIN, AEROBIC OR SUSPENDED GROWTH SYSTEMS,MEMBRANE BIOLOGICAL REACTORS
Aerobic treatment of wastewater preceded by primary treatment
NA NREntire enclosed space
Unclassified NC, LFS
10
TRICKLING FILTER, BIO-TOWER, AEROBIC FIXED-FILM SYSTEMS
Aerobic biological treatment of wastewater
Not normally a significant hazard; however, these processesmight contain materials that are combustible under certainconditions
NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primarysedimentation.
NR
11 a
ANAEROBIC TOWERS, ANAEROBIC FIXED-FILM SYSTEM
Anaerobic biological treatment if sealed from atmosphere
Normally producescombustible gas as treatment process by-product
NA Tank interior Division 1 NC
b3 m (10 ft) envelope around tank
Division 2 NC, LFS
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
12 a
GAS-HANDLING SYSTEMS FOR LIQUID TREATMENT PROCESSES
Combustible gas, oftenunder pressure
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment2
13
OXYGEN AERATION TANKS
Tanks for aerobic treatment of wastewater using high-purity oxygenrather than air
Ignition of flammable gases and floating flammable liquids in an oxygen-
enriched environment
NA Enclosed space
Division 2 (If unit process is not preceded by primarysedimentation, see Primary Sedimentation Tanks in Table 5.2 forclassification.)
Any equimatethe rspacsafe expovolathydrin an
enricatmo
14
INTERMEDIATE, SECONDARY, OR TERTIARY SEDIMENTATION TANKS
Separate floating and settleable solids from wastewater at various treatment stages
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primarysedimentation.
NR
15
FLASH MIXER OR FLOCCULATION TANKS
Tanks for mixing various treatment chemicals with wastewater
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primarysedimentation.
NR
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
16
NITRIFICATION AND DENITRIFICATION TANKS
Tertiary treatment of wastewater to reduce or remove nitrogen
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primarysedimentation.
NR
17
BREAKPOINT CHLORINATION TANKS AND CHLORINE CONTACT TANKS
Application of chlorine in aqueous solution to wastewater
NA NR NA Unclassified
NR (unit use chemrequuse omateconsSpecconsshallto thmatecons
18AMMONIA STRIPPING TOWERS
(See Trickling Filter in Table 5.2.)
NA NA Unclassified
NR (unit use chemSpecconsshallto thmatecons
19
INTERMEDIATE OR FINAL PUMPING STATIONS
Pump(s) at intermediate stage or end of the treatment process
NA NR NA Unclassified NR
20
GRAVITY AND PRESSURE FILTERS
Filtering of treated wastewater through sand or other media
NA NR NA Unclassified NR
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
21
CARBON COLUMN OR TANKS
Vessels containing carbon for tertiary treatment of wastewater
Significant hazard from combustible carbon material
NA NA Unclassified NR
22
ON-SITE OZONE GENERATION SYSTEM AND OZONE CONTACT TANKS
Ozone generation and purification for disinfection ofwastewater
Similar to oxygen generation with addition of being highlycorrosive (see Table D.1.1)
NA NA Not covered in this standard NR
23
BACKWASH WATER AND WASTE BACKWASH WATER HOLDING TANKS
Tanks for temporary storage of backwash water
NA NA NA Unclassified NR
24
ULTRAVIOLET DISINFECTION UNIT
Disinfection of wastewater effluent by ultraviolet radiation
NA NR NA Unclassified NR
25
EFFLUENT STRUCTURES
Various structures conveying treated wastewater away from treatmentprocesses
NA NR NA Unclassified NR
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
26 a
ODOR-CONTROL SYSTEM AREAS
Areas physically separated from processes that house systemshandling leakage and ignition of process gases and vapors
Leakage and ignition offlammable gases
D Entire area if enclosed Division 2 NC,
LFS
b C
Areas within 0.9 m (3 ft) of leakage sources such as fans,dampers, flexible connections, flanges, pressurized unwelded ductwork, and odor-control vessels
Division 2
cAreas beyond 0.9 m (3 ft)
Unclassified
Notes:(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to Figure A.5.2 and specific requirements for each location and function.
(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9.1.2.
C: Continuously ventilated at six 6 air changes per hour or in accordance with Chapter 9.1.2.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FE: Portable fire extinguisher.
H: Hydrant protection in accordance with 7.2.4.
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LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.
NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NR: No requirement.Footnotes:1Open channels and open structures upstream from the unit processes are classified the same as the downstream processes they supply.2The area beyond the envelope is unclassified.3Where liquid turbulence is not induced by aeration or other factors, the following criteria apply: (1) interior of the tank from the minimum operating water surface to the top of the tank wall; (2) envelope 0.46 m (18 in.) above the top of the tank and extending 0.46 m (18 in.) beyond the exterior wall; (3) envelope 0.46 m (18 in.) above grade extending 3 m (10 ft) horizontally from the exterior tank walls.4These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
Additional Proposed Changes
File Name Description Approved820_Rainville_4_820-2008.pdf Cover Sheet
Statement of Problem and Substantiation for Public Input
Per 9.1.1.4, ventilation requirements not addressed by Chapters 4, 5, and 6 shall meet the requirements of 9.1.1.4. If I correctly understand that the requirements of Section 9.3, Ventilation Criteria apply only to Table 9.1.1.4 then the only alternative requirements in Chapter 9 as implied by the current text "or in accordance with Chapter 9" in the Notes of Tables 4.2, 5.2, and 6.2(a) would appear to be Section 9.1.2. Proposed change will avoid confusion and misapplication of Section 9.3 to the requirements of Table 4.2, 5.2, and 6.2(a).
Submitter Information Verification
Submitter Full Name: Charles RainvilleOrganization: Hallam-ICSStreet Address: City:State: Zip: Submittal Date: Tue Feb 19 11:40:18 EST 2013
Copyright Assignment
Page 75 of 270National Fire Protection Association Report
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I, Charles Rainville, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Charles Rainville, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 9-NFPA 820-2013 [ Section No. 5.2 ]
5.2* Design and Construction.The design and construction of liquid stream treatment processes shall conform to Table 5.2.Table 5.2 Liquid Stream Treatment Processes
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
1 a
COARSE AND FINE SCREEN FACILITIES
Removal of screenings from raw wastewater
Possible ignition offlammable gases and floating flammable liquids
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and openchannel
2
PUMPING STATIONS
(See Collection Systems, Table 4.2.)
3 a
FLOW EQUALIZATION TANKS
Storage of raw or partially treated wastewater
Possible ignition offlammable gases and floating flammable liquids
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and openchannel2,3
4 a
GRIT REMOVAL TANKS
Separation of grit from raw wastewater
Possible ignition offlammable gases and floating flammable liquids
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
c
Not enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and openchannel2,3
5 a
PRE-AERATION TANKS
Conditioning of wastewater prior to further treatment
Possible ignition offlammable gases and floating flammable liquids
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
c
Not enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and openchannel2,3
6 a
PRIMARY SEDIMENTATION TANKS
Separation of floating or settleable solids from rawwastewater
Possible ignition of flammable gases and floating flammableliquids
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
cNot enclosed, open to atmosphere
Interior of the tank from the minimum operating water surface to the top of the tank wall; envelope 0.46 m (18 in.) above the top of the tank and extending 0.46 m (18 in.) beyond the exterior wall; envelope 0.46 m (18 in.) above grade extending 3 m (10 ft) horizontally from theexterior tank walls
7
AERATION BASIN, POND, LAGOON, OXIDATION DITCH, AEROBICSUSPENDED GROWTH SYSTEMS, SEQUENCING BATCH REACTORS Aerobic treatment of wastewater open to the atmosphere
NA NR
Classified (see Primary Sedimentation)
Unclassified if process is preceded by primary sedimentation
NR
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
8 a
ENCLOSED AERATION BASIN, AEROBIC OR SUSPENDED GROWTH SYSTEMS,MEMBRANE BIOLOGICAL REACTORS
Aerobic treatment not preceded by primary treatment
Possible ignition offlammable gases or floating flammable liquids
A (Interior oftank)
Entire enclosed space or tank of system
Division 1 NC
Exterior of enclosed space or tank, installed in abuilding
Division 2 NC, LFS
Exterior of enclosed space or tank, installed outdoors;envelope 0.46 m (18 in.) surrounding tank
Division 2 NC, LFS
b
B (Interior of tankmaintained at negative pressure)
Entire enclosed space or tank of system
Division 2 NC, LFS
Exterior of enclosed space or tank, installed in abuilding
Unclassified NC, LFS
Exterior of enclosed space or tank, installed outdoors
Unclassified NC, LFS
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
c
Not enclosed, open to atmosphere
Interior of tank from the minimum operating water surface tothe top of the tank wall; envelope 0.46 m (18 in.) above the top of the tank and extending 0.46 m (18 in.) beyond exterior wall; envelope 0.46 m (18 in.) above grade and extending 3 m (10 ft) horizontally from theexterior tank walls
Division 2 NC, LFS
d
RESIDENTIAL ENCLOSED AERATION BASIN, AEROBIC OR SUSPENDEDGROWTH SYSTEMS, MEMBRANE BIOLOGICAL REACTORS
Aerobic treatment not preceded by primary treatment, serving one but not more than five dwellings
Possible ignition of flammable gases or floating flammableliquids
A (Interior of tank)
Entire enclosed space or tank of system
Division 2 NC
Exterior of enclosed space or tank, installed in abuilding
Unclassified NC, LFS
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
Exterior of enclosed space or tank, installed outdoors
Unclassified NC, LFS
9
ENCLOSED AERATION BASIN, AEROBIC OR SUSPENDED GROWTH SYSTEMS,MEMBRANE BIOLOGICAL REACTORS
Aerobic treatment of wastewater preceded by primary treatment
NA NREntire enclosed space
Unclassified NC, LFS
10
TRICKLING FILTER, BIO-TOWER, AEROBIC FIXED-FILM SYSTEMS
Aerobic biological treatment of wastewater
Not normally a significant hazard; however, these processesmight contain materials that are combustible under certainconditions
NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primarysedimentation.
NR
11 a
ANAEROBIC TOWERS, ANAEROBIC FIXED-FILM SYSTEM
Anaerobic biological treatment if sealed from atmosphere
Normally producescombustible gas as treatment process by-product
NA Tank interior Division 1 NC
b3 m (10 ft) envelope around tank
Division 2 NC, LFS
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
12 a
GAS-HANDLING SYSTEMS FOR LIQUID TREATMENT PROCESSES
Combustible gas, oftenunder pressure
A Enclosed—entire space Division 1 NC
b B Division 2 NC, LFS
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment2
13
OXYGEN AERATION TANKS
Tanks for aerobic treatment of wastewater using high-purity oxygenrather than air
Ignition of flammable gases and floating flammable liquids in an oxygen-
enriched environment
NA Enclosed space
Division 2 (If unit process is not preceded by primarysedimentation, see Primary Sedimentation Tanks in Table 5.2 forclassification.)
Any equimatethe rspacsafe expovolathydrin an
enricatmo
14
INTERMEDIATE, SECONDARY, OR TERTIARY SEDIMENTATION TANKS
Separate floating and settleable solids from wastewater at various treatment stages
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primarysedimentation.
NR
15
FLASH MIXER OR FLOCCULATION TANKS
Tanks for mixing various treatment chemicals with wastewater
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primarysedimentation.
NR
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
16
NITRIFICATION AND DENITRIFICATION TANKS
Tertiary treatment of wastewater to reduce or remove nitrogen
NA NR NA
Classified (see Primary Sedimentation)
Unclassified if unit process is preceded by primarysedimentation.
NR
17
BREAKPOINT CHLORINATION TANKS AND CHLORINE CONTACT TANKS
Application of chlorine in aqueous solution to wastewater
NA NR NA Unclassified
NR (unit use chemrequuse omateconsSpecconsshallto thmatecons
18AMMONIA STRIPPING TOWERS
(See Trickling Filter in Table 5.2.)
NA NA Unclassified
NR (unit use chemSpecconsshallto thmatecons
19
INTERMEDIATE OR FINAL PUMPING STATIONS
Pump(s) at intermediate stage or end of the treatment process
NA NR NA Unclassified NR
20
GRAVITY AND PRESSURE FILTERS
Filtering of treated wastewater through sand or other media
NA NR NA Unclassified NR
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
21
CARBON COLUMN OR TANKS
Vessels containing carbon for tertiary treatment of wastewater
Significant hazard from combustible carbon material
NA NA Unclassified NR
22
ON-SITE OZONE GENERATION SYSTEM AND OZONE CONTACT TANKS
Ozone generation and purification for disinfection ofwastewater
Similar to oxygen generation with addition of being highlycorrosive (see Table D.1.1)
NA NA Not covered in this standard NR
23
BACKWASH WATER AND WASTE BACKWASH WATER HOLDING TANKS
Tanks for temporary storage of backwash water
NA NA NA Unclassified NR
24
ULTRAVIOLET DISINFECTION UNIT
Disinfection of wastewater effluent by ultraviolet radiation
NA NR NA Unclassified NR
25
EFFLUENT STRUCTURES
Various structures conveying treated wastewater away from treatmentprocesses
NA NR NA Unclassified NR
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Row Line
Location
and
Function
Fire and Explosion
HazardVentilation
Extent of Classified
Area1
NEC -Area Electrical
Classification
(All Class I, Group D)4
MaConfor
St
26 a
ODOR-CONTROL SYSTEM AREAS
Areas physically separated from processes that house systemshandling leakage and ignition of process gases and vapors
Leakage and ignition offlammable gases
D Entire area if enclosed Division 2 NC,
LFS
b C
Areas within 0.9 m (3 ft) of leakage sources such as fans,dampers, flexible connections, flanges, pressurized unwelded ductwork, and odor-control vessels
Division 2
cAreas beyond 0.9 m (3 ft)
Unclassified
Notes:(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to Figure A.5.2 and specific requirements for each location and function.
(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FE: Portable fire extinguisher.
H: Hydrant protection in accordance with 7.2.4.
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LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.
NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NR: No requirement.Footnotes:1Open channels and open structures upstream from the unit processes are classified the same as the downstream processes they supply.2The area beyond the envelope is unclassified.3Where liquid turbulence is not induced by aeration or other factors, the following criteria apply: (1) interior of the tank from the minimum operating water surface to the top of the tank wall; (2) envelope 0.46 m (18 in.) above the top of the tank and extending 0.46 m (18 in.) beyond the exterior wall; (3) envelope 0.46 m (18 in.) above grade extending 3 m (10 ft) horizontally from the exterior tank walls.4These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
Add a new row for both enclosed, and open control structures classified similarly to primary sedementation.
Additional Proposed Changes
File Name Description Approved820_Harrell.pdf Cover Sheet
Statement of Problem and Substantiation for Public Input
Wastewater treatment plants frequently have control structures; however, this is overlooked in Chapter 5. In plants, these structures can be open or enclosed; this is currently not addressed.
Submitter Information Verification
Submitter Full Name: John HarrellOrganization: Wilson & Company, Inc.Street Address: City: State:Zip: Submittal Date: Mon Mar 04 10:31:58 EST 2013
Copyright Assignment
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I, John Harrell, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Harrell, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 1-NFPA 820-2012 [ Section No. 6.2 ]
6.2* Design and Construction. Revise Table 6.2(a) Row 12 and add a new Row 13 (renumber subsequent Rows) as shown in the uploadeddocument.The design and construction of solids treatment processes shall conform to Table 6.2(a) and Table 6.2(b).
Table 6.2(a) was revised by a tentative interim amendment (TIA). See page 1.Table 6.2(a) Solids Treatment Processes
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
1
COARSE AND FINE SCREENINGS-
HANDLING BUILDINGS
Storage, conveying, or dewatering of screenings (no exposed flow ofwastewater through building or area)
NA NR NA Unclassified
2
GRIT-HANDLING BUILDING
Storage, conveying, and dewatering of heavy small screenings andgrit (no exposed flow of wastewater through building or area)
NA NR NA Unclassified
3 a
SCUM-HANDLING BUILDING OR AREA
Holding, dewatering, or storage
Possible grease orflammable liquids carryover
A Enclosed space Division 2
b B Unclassified
cNot enclosed, open to atmosphere
NA
4 a SCUM PITS
Buildup of vapors from flammable or combustible liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel1
5 a
SCUM-PUMPING AREAS
Pumping of scum, wet side of pumping station
Carryover of floatingflammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel1
6 a
SCUM-PUMPING AREAS
Pumping of scum, dry side of pumping station
Not significant D Enclosed space Division 2
b C Unclassified
cNot enclosed, open to atmosphere
NA
7
SCUM INCINERATORS2
Elimination of scum throughburning
Firebox explosion from possible carryover of flammablescum
NRIncinerator area if separated from scum storage
Unclassified
8 a
SLUDGE THICKENER (CLARIFIER)
Sludge concentration and removal, gravity, or dissolved airflotation
Possible generation of methane from sludge; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls1
9 a
SLUDGE PUMPING STATION DRY WELLS
Dry side of a sludge pumping station
Buildup of methane gasor flammable vapors
D
Entire dry well when physically separated from a wet well orseparate structures
Division 2
b C
Entire dry well when physically separated from a wet well orseparate structures
Unclassified
10 a
SLUDGE STORAGE WET WELLS, PITS, AND HOLDING TANKS
Retaining of sludge
Possible generation of methane gas in explosive concentrations;carryover of floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls1
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
11 a
SLUDGE-BLENDING TANKS AND HOLDING WELLS
Retaining of sludge with some agitation
Possible generation ofmethane gas in explosive concentrations; carryover of floating flammableliquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls1
12
DEWATERING BUILDINGS CONTAINING CENTRIFUGES, GRAVITY BELTTHICKENERS, BELT AND VACUUM FILTERS, AND FILTER PRESSES
Removal of water from sludge and the conveyance of sludge cake
Accumulation of methane gas
C Entire room Unclassified
13 a
ENCLOSED SLUDGE CAKE STORAGE
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulation of methane gas
C Entire room Unclassified
b
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulation of methane gas
D Entire room Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
14
INCINERATORS2
AND INCINERATOR BUILDINGS
Conveying and burning of sludge cake
Firebox explosion NR NA Unclassified
15
HEAT TREATMENT UNITS, LOW- OR HIGH-PRESSURE OXIDATION UNITS
Closed oxidation of sludge
None, other than in high-pressure systems
NR NA Unclassified
16 a
ANAEROBIC DIGESTERS, BOTH FIXED ROOF AND FLOATING COVERGeneration of sludge gas from digesting sludge
Leakage of gas fromcover, piping, emergency relief valves, and appurtenances
Not enclosed, open toatmosphere
Tank interior; areas above and around digester cover; envelope 3 m (10 ft) above the highest point of cover, when cover is at its maximumelevation, and 1.5 m (5 ft) from any wall
Division 1
b
Envelope
4.6 m (15 ft) above Division 1 area over cover and
1.5 m (5 ft) beyond Division 1 area around tank walls
Division 2
c A
For digester tanks enclosed in a building: tank interior;entire area inside building
Division 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
d B
For digester tanks enclosed in a building: tank interior; areas above and around digester cover; envelope 3 m (10 ft) above highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall of digester tank
Division 1
eRemaining space in enclosed area
Division 2
17 a
ANAEROBIC DIGESTER CONTROL BUILDING
Storage, handling, or burning of sludge gas
Leaking and ignition ofsludge gas
A Entire building Division 1
b BEnclosed areas that contain gas-handling equipment
Division 2
c CPhysically separated from gas-handling equipment
Unclassified
18 a
DIGESTER GAS-PROCESSING ROOMS
Gas compression, handling, and processing
Sludge gasignition A Entire room Division 1
b B Division 2
c BWithin 1.5 m (5 ft) of equipment
Division 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
19
ANAEROBIC DIGESTER GAS STORAGE
Storage of sludge gas
Gas storage piping and handling
NNV
Within a 3 m (10 ft) envelope of tanks, valves, andappurtenances
Division 1
20 a
WASTE
GAS
BURNERS
Combusting excess gas
Gas piping and appurtenances NA
Within 3 m (10 ft) envelope of all fixtures, appurtenances, and housing
Division 1
b
Envelope
4.6 m (19 ft) above Division 1 envelope and 1.5 m (5 ft) on all sides
Division 2
21
CHLORINE OXIDATION UNITS
Chlorine reaction with sludge
Chlorine is a very strong oxidizing agent
NR NA Unclassified
22 a
UNDERGROUND (PIPING) TUNNELS CONTAINING NATURAL GAS PIPING ORSLUDGE GAS PIPING
Transmission of gas, sludge, water, air, and steam via piping; also might contain power cable and conduit
Ignition of natural gas or sludge gases
DWithin 3 m (10 ft) of valves and appurtenances
Division 1
b Entire tunnel Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
c C
Areas within 3 m (10 ft) of valves, meters, gas check valves,condensate traps, and other piping appurtenances
d Areas beyond 3 m (10 ft) Unclassified
23
UNDERGROUND (PIPING) TUNNELS NOT CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of sludge, water, air, and steam piping; also mightcontain power cable and conduit
NA NR NA Unclassified
24 a
COMPOSTING PILES
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials can self-ignite)
D Enclosed area Division 2
b C Unclassified
25 a
IN-VESSEL COMPOSTING
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials can self-ignite)
As required by process
If enclosed, interior of reactor vessel plus a 3 m (10 ft) envelope around reactor vessel
Division 2
b Areas beyond 3 m (10 ft) Unclassified
26 a
ODOR-CONTROL SYSTEM AREAS Areas physically separated fromprocesses that house systems handling flammable gases
Leakage and ignition ofprocess gases and vapors
D Entire area if enclosed Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
b C
Areas within 0.9 m (3 ft) of leakage sources such as fans,dampers, flexible connections, flanges, pressurized unwelded ductwork, andodor-control vessels
Division 2
c Areas beyond 0.9 m (3 ft) Unclassified
27
PUMPING OF DRAINAGE FROM DIGESTED SLUDGE-
DEWATERING PROCESSES
Pumping of centrate, filtrate, leachate, drying beds, and soforth
NA NR NA Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to the specific figures in A.6.2 and for specific requirements for each location and function.(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FAS: Fire alarm system.FDS: Fire detection system.
FE: Portable fire extinguisher.
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FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NNV: Not normally ventilated.
NR: No requirement.
Footnotes:1The area beyond the envelope is unclassified.2See NFPA 54, NFPA 82, and NFPA 85.3These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
Table 6.2(b) Solids Treatment Processes — Sludge Drying
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -Area Electrical
Classification (All Class II, Group G) 2
MCofor
S
1 aSLUDGE-DRYING PROCESSES 3
Potential for ignition of dust
NR
If exposed to combustible particulate solids, entire room 4
Division 1
NC(Coin awithNFPNFPNFPNFP
b NR
Areas within equipment processing combustible particulate solids
Division 1
c NR
Areas within 3 m (10 ft) of equipment processing combustible particulatesolids
Division 2
d NR
Areasbeyond 3 m (10 ft) of equipment processing combustible particulatesolids
Unclassified
2 a
DRIEDSLUDGE STORAGE AREAS, IF ENCLOSED
Potential for ignition of dust
NR
If exposed to dried sludge, entire room 4
Division 1
NC(Coin awithandNFPNFP
b NRAreas within tanks storing dried sludge
Division 1
c NR
Areas within 3 m (10 ft) of tanks storing dried sludge
Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -Area Electrical
Classification (All Class II, Group G) 2
MCofor
S
d NR
Areasbeyond 3 m (10 ft) of tanks storing dried sludge
Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space and, therefore, Table 9.1.1.4 also has no requirements.
(2) The following codes are used in this table:FAS: Fire alarm system.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
NEC: In accordance with NFPA 70.
NC: Noncombustible material.
NR: No requirement.
Footnotes:1For sludge-drying processes that use flammable or combustible liquids, ventilate in accordance with NFPA 30.2Or if acceptable to the authority having jurisdiction with classification in NFPA 499.3See NFPA 54, NFPA 85, NFPA 499, and NFPA 654. For sludge-drying processes that use flammable or combustible liquids, see NFPA 30.4The area beyond the envelope is unclassified.
Additional Proposed Changes
File Name Description Approved820_Tb6.2_a_Log_1.docx Table 6.2(a) Row 12
Statement of Problem and Substantiation for Public Input
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Note: This Public Input originates from Tentative Interim Amendment 820-12-1 (TIA 1025) issued by the Standards Council on August 11, 2011.Table 6.2(a) Row 12 has been causing confusion to industry. This TIA seeks to eliminate confusion of this requirement and reduce compliance burdens. Justification for reducing from Class 1 Division 1: Wastewater treatment dewatering operations are one of the final stages of treatment and
have a reduced risk of fire or explosion hazards. Row 12 of Table 6.2(a) recognizes this reduced hazard and the operational area is “unclassified” in Line b. Additionally, stored dewatered sludge cake (a semi-solid product of sludge dewatering) has a reduced (but not entirely absent) risk of fire or explosion from an accumulation of methane gas. Classifying storage areas with dewatered sludge cake as a Class I Division 1 location
creates an unnecessary burden on plant operators in an area with a minimal risk for fire or explosion from the accumulation of methane gas. In addition, line “b” refers to the “conveyance of thickened sludge.” While this occurs in the actual dewatering area it does not typically occur in storage areas. Sludge thickening and storage operations are covered in Rows 8, 9, 10 and 11 and are appropriately classified in these Rows. Row 12 line b already considers the risk for the actual dewatering operation to be minimal as evidenced by the “unclassified” status of this operation when 6 air changes per hour (ACH) are provided for the location.Considering the reduced risk of methane gas during sludge cake storage this operation is
more appropriately classified as a Class I Division 2 location. It is recognized that the primary hazard in a sludge cake storage area is the accumulation and ignition of combustible dust. This hazard is addressed in Table 6.2(b) of NFPA 820. However, where different types of material — such as a flammable gas and a combustible dust — may exist in a process or location, the area must be classified as both a Class I and a Class II location, and protection must be provided for both hazards. Classification is necessary and appropriate for a sludge cake storage location; however, the classification must reflect the real and potential risk of flammable gas ignition and ensure a level of protection that mitigates the minimized risk in this location. While a reduced level of protection a designation of Class I Division 2 for sludge cake storage areas would accomplish this risk mitigation.As background, Class I, Division 2 locations, boxes, fittings, and joints are not required to
be explosionproof when they contain no arcing devices; or for lighting outlets or enclosures containing non-arcing devices (such as solid-state relays, solenoids, and control transformers), if the maximum operating temperature of any exposed surface does not exceed 80 percent of the ignition temperature. However, when a general-purpose enclosure is installed using rigid or intermediate metal
conduit, a bonding jumper with proper fittings or bonding-type locknuts is required to be used between the enclosure and the raceway to ensure adequate bonding from the hazardous area to the point of grounding at the service equipment or separately derived system. See 501.30 for grounding and bonding requirements.
Where necessary, limited flexibility is provided through use of flexible metal conduit, liquidtight flexible conduit, and extra-hard-usage flexible cord, and the fittings of this type are not required to be specifically approved for Class I locations. Also, where flexible conduit or liquidtight flexible conduit is used, internal or external bonding jumpers with proper fittings must be provided in accordance with 501.30(B), unless liquidtight flexible conduit is installed under the conditions described in 501.30(B), Exception. Section 501.10(B)(1) permits a variety of cable types, cable tray systems, enclosed
gasketed wireways, and enclosed gasketed busways, each with associated fittings. These are not required to be specifically listed or labeled for Class I, Division 2 locations. For example, if Type ITC or MC cable is used, neither the cable nor the fittings need to be listed for use in hazardous locations.Providing this electrical equipment installation flexibility is important to the design and
operation of wastewater treatment facilities, specifically sludge cake storage locations.Further editing was performed to clarify enclosed sludge cake storage areas and to
distinguish these areas from dewatering buildings. As a consequence, another line was added, now Row 13 Line a, which classifies enclosed sludge cake storage areas with type C ventilation as UNCLASSIFIED. Emergency Nature: Treating sludge storage as a Class 1 Division 1 electrical hazard is
considered to be an expensive and unnecessary requirement for wastewater treatment
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facility designers and operators. Revising Row 12 of Table 6.2(a) helps remove confusion, while reducing to a hazard classification of Class 1 Division 2 which will adequately mitigate the risk of fire or explosion. A Div 2 classification is determined to provide adequate protection and more flexibility for designers and operators.
Submitter Information Verification
Submitter Full Name: TC on WAA-AAAOrganization: NFPAAffilliation: TC on Wasterwater Treatment PlantsStreet Address:City: State: Zip:Submittal Date: Wed Nov 14 10:09:10 EST 2012
Copyright Assignment
I, TC on WAA-AAA, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am TC on WAA-AAA, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 12-NFPA 820-2013 [ Section No. 6.2 ]
6.2 * Design and Construction.The design and construction of solids treatment processes shall conform to Table 6.2(a) and Table 6.2(b).
Table 6.2(a) was revised by a tentative interim amendment (TIA). See page1.Table 6.2(a) Solids Treatment Processes
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Row LineLocation
and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class I, Group D) 3
MatConsfor B
Stru
1
COARSE AND FINE SCREENINGS-
HANDLING BUILDINGS
Storage, conveying, or dewatering of screenings (no exposed flow of wastewater through building or area)
NA NR NA Unclassified NC, LLFS
2
GRIT-HANDLINGBUILDING
Storage, conveying, and dewatering of heavy small screenings and grit (no exposed flow of wastewater through building or area)
NA NR NA Unclassified NC, LLFS
3 a
SCUM-HANDLINGBUILDING OR AREA
Holding, dewatering, or storage
Possiblegrease or flammable liquids carryover
A Enclosedspace Division 2 NC, L
LFS
b B Unclassified
cNot enclosed, open to atmosphere
NA
4 a SCUM PITS
Buildup of vapors from flammable or combustible liquids
AEnclosed—entire space
Division 1 NC
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Row LineLocation
and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class I, Group D) 3
MatConsfor B
Stru
b B Division 2 NC, LLFS
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 1
5 a
SCUM-PUMPINGAREAS
Pumping of scum, wet side of pumping station
Carryover of floating flammable liquids
AEnclosed—entire space
Division 1 NC
b B Division 2 NC, LLFS
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 1
6 a
SCUM-PUMPINGAREAS
Pumping of scum, dry side of pumping station
Not significant
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Leakage of flammable liquids
D Enclosed space Division 2 NC, LC, or LFS FE
b C Unclassified
c
Notenclosed, open to atmosphere
NA
7
SCUMINCINERATORS 2
Elimination of scum through burning
Fireboxexplosion from possible carryover of flammable scum
NRIncineratorarea if separated from scum storage
Unclassified
8 a
SLUDGETHICKENER (CLARIFIER)
Sludge concentration and removal, gravity, or dissolved air flotation
Possiblegeneration of methane from sludge; carryover of floating flammableliquids
A Enclosed—entire space Division 1
b B Division 2
cNotenclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
9 a
SLUDGEPUMPING STATION DRY WELLS
Dry side of a sludge pumping station
Buildup of methane gas or flammable vapors
D
Entire dry well when physically separated from a wet well or separatestructures
Division 2
b C
Entire dry well when physically separated from a wet well or separatestructures
Unclassified
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10 a
SLUDGESTORAGE WET WELLS, PITS, AND HOLDING TANKS
Retaining of sludge
Possiblegeneration of methane gas in explosive concentrations; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNotenclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
11 a
SLUDGE-BLENDINGTANKS AND HOLDING WELLS
Retaining of sludge with some agitation
Possiblegeneration of methane gas in explosive concentrations; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNotenclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
12
DEWATERINGBUILDINGS CONTAINING CENTRIFUGES, GRAVITY BELT THICKENERS, BELT AND VACUUMFILTERS, AND FILTER PRESSES
Removal of water from sludge and the conveyance of sludge cake
Accumulationof methane gas
C Entire room Unclassified
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13 a
ENCLOSEDSLUDGE CAKE STORAGE
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulationof methane gas
C Entire room Unclassified
b
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulationof methane gas
D Entire room Division 2
14
INCINERATORS 2
AND INCINERATOR BUILDINGS
Conveying and burning of sludge cake
Fireboxexplosion NR NA Unclassified
15
HEATTREATMENT UNITS, LOW- OR HIGH-PRESSURE OXIDATION UNITS
Closed oxidation of sludge
None, other than in high-pressure systems
NR NA Unclassified
16 a
ANAEROBICDIGESTERS, BOTH FIXED ROOF AND FLOATING COVER Generation of sludge gas from digesting sludge
Leakage of gas from cover, piping, emergency relief valves, andappurtenances
Notenclosed, open to atmosphere
Tank interior; areas above and around digester cover; envelope 3 m (10 ft) above the highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall
Division 1
b
Envelope
4.6 m (15 ft) above Division 1 area over cover and
1.5 m (5 ft) beyond Division 1 area around tank walls
Division 2
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c A
For digester tanks enclosed in a building: tank interior; entire area inside building
Division 1
d B
For digester tanks enclosed in a building: tank interior; areas above and around digester cover; envelope 3 m (10 ft) above highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall of digester tank
Division 1
eRemainingspace in enclosed area
Division 2
17 a
ANAEROBICDIGESTER CONTROL BUILDING
Storage, handling, or burning of sludge gas
Leaking and ignition of sludge gas
A Entire building Division 1
b B
Enclosed areas that contain gas-handling equipment
Division 2
c CPhysicallyseparated from gas-handling equipment
Unclassified
18 a
DIGESTER GAS-PROCESSING ROOMS
Gas compression, handling, and processing
Sludge gas ignition A Entire room Division 1
b B Division 2
c BWithin 1.5 m (5 ft) of equipment
Division 1
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19
ANAEROBICDIGESTER GAS STORAGE
Storage of sludge gas
Gas storage piping and handling
NNV
Within a 3 m (10 ft) envelope of tanks, valves, and appurtenances
Division 1
20 a
WASTE
GAS
BURNERS
Combusting excess gas
Gas piping and appurtenances NA
Within 3 m (10 ft) envelope of all fixtures, appurtenances, and housing
Division 1
b
Envelope
4.6 m (19 ft) above Division 1 envelope and 1.5 m (5 ft) on all sides
Division 2
21
CHLORINEOXIDATION UNITS
Chlorine reaction with sludge
Chlorine is a very strong oxidizing agent
NR NA Unclassified
tt
t
22 a
UNDERGROUND(PIPING) TUNNELS CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of gas, sludge, water, air, and steam via piping; also might contain power cable and conduit
Ignition of natural gas or sludge gases
D
Within 3 m (10 ft) of valves and appurtenances
Division 1
b Entire tunnel Division 2
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c C
Areas within 3 m (10 ft) of valves, meters, gas check valves, condensate traps, and other piping appurtenances
d Areas beyond 3 m (10 ft) Unclassified
23
UNDERGROUND(PIPING) TUNNELS NOT CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of sludge, water, air, and steam piping; also might contain power cable and conduit
NA NR NA Unclassified
24 a
COMPOSTINGPILES
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials canself-ignite)
D Enclosed area Division 2
b C Unclassified
25 a
IN-VESSELCOMPOSTING
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials canself-ignite)
As required by process
If enclosed, interior of reactor vessel plus a 3 m (10 ft) envelope around reactor vessel
Division 2
b Areas beyond 3 m (10 ft) Unclassified
26 a
ODOR-CONTROLSYSTEM AREAS Areas physically separated from processes that house systemshandling flammable gases
Leakage and ignition of process gases and vapors
D Entire area if enclosed Division 2
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b C
Areas within 0.9 m (3 ft) of leakage sources such as fans, dampers, flexibleconnections, flanges, pressurized unwelded ductwork, and odor-controlvessels
Division 2
c Areas beyond 0.9 m (3 ft) Unclassified
27
PUMPING OF DRAINAGE FROM DIGESTED SLUDGE-
DEWATERING PROCESSES
Pumping of centrate, filtrate, leachate, drying beds, and so forth
NA NR NA Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to the specific figures in A.6.2 and for specific requirements for each location and function.
(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FAS: Fire alarm system.
FDS: Fire detection system.
FE: Portable fire extinguisher.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
LC: Limited-combustible material.LFS: Low flame spread material.
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NA: Not applicable.
NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NNV: Not normally ventilated.
NR: No requirement.
Footnotes:1The area beyond the envelope is unclassified.2See NFPA 54, NFPA 82, and NFPA 85.3These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
Table 6.2(b) Solids Treatment Processes — Sludge Drying
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
1 aSLUDGE-DRYING PROCESSES 3
Potential for ignition of dust
NR
If exposed to combustible particulate solids, entire room 4
Division 1
NC(Cin witNFNFNFNF
b NR
Areas within equipment processing combustible particulate solids
Division 1
c NR
Areas within 3 m (10 ft) of equipment processing combustible particulatesolids
Division 2
d NR
Areasbeyond 3 m (10 ft) of equipment processing combustible particulatesolids
Unclassified
2 aDRIED SLUDGE STORAGE AREAS, IF ENCLOSED
Potential for ignition of dust
NR
If exposed to dried sludge, entire room 4
Division 1
NC(Cin witanNFNF
b NRAreas within tanks storing dried sludge
Division 1
c NR
Areas within 3 m (10 ft) of tanks storing dried sludge
Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
d NR
Areasbeyond 3 m (10 ft) of tanks storing dried sludge
Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space and, therefore, Table 9.1.1.4 also has no requirements.
(2) The following codes are used in this table:FAS: Fire alarm system.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
NEC: In accordance with NFPA 70.
NC: Noncombustible material.
NR: No requirement.
Footnotes:1For sludge-drying processes that use flammable or combustible liquids, ventilate in accordance with NFPA 30.2Or if acceptable to the authority having jurisdiction with classification in NFPA 499.3See NFPA 54, NFPA 85, NFPA 499, and NFPA 654. For sludge-drying processes that use flammable or combustible liquids, see NFPA 30.4The area beyond the envelope is unclassified.
Statement of Problem and Substantiation for Public Input
Table 6.2(a) Row 6Recommend revising the fire and explosion hazard for consistency with the scum flammable liquid hazard listed in Row 4 and 5. The hazard would occur if there is leakage of scum containing flammable liquids.
Submitter Information Verification
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Submitter Full Name: TOM BURGESSOrganization: ARCADISStreet Address: City:State: Zip: Submittal Date: Sun Mar 10 13:00:48 EDT 2013
Copyright Assignment
I, TOM BURGESS, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am TOM BURGESS, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 13-NFPA 820-2013 [ Section No. 6.2 ]
6.2 * Design and Construction.The design and construction of solids treatment processes shall conform to Table 6.2(a) and Table 6.2(b).
Table 6.2(a) was revised by a tentative interim amendment (TIA). See page1.Table 6.2(a) Solids Treatment Processes
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
1
COARSE AND FINE SCREENINGS-
HANDLING BUILDINGS
Storage, conveying, or dewatering of screenings (no exposed flow of wastewater through building or area)
NA NR NA Unclassified
2
GRIT-HANDLINGBUILDING
Storage, conveying, and dewatering of heavy small screenings and grit (no exposed flow of wastewater through building or area)
NA NR NA Unclassified
3 a
SCUM-HANDLINGBUILDING OR AREA
Holding, dewatering, or storage
Possiblegrease or flammable liquids carryover
A Enclosedspace Division 2
b B Unclassified
cNot enclosed, open to atmosphere
NA
4 a SCUM PITS
Buildup of vapors from flammable or combustible liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 1
5 a
SCUM-PUMPINGAREAS
Pumping of scum, wet side of pumping station
Carryover of floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 1
6 a
SCUM-PUMPINGAREAS
Pumping of scum, dry side of pumping station
Not significant D Enclosedspace Division 2
b C Unclassified
cNot enclosed, open to atmosphere
NA
7
SCUMINCINERATORS 2
Elimination of scum through burning
Fireboxexplosion from possible carryover of flammable scum
NRIncineratorarea if separated from scum storage
Unclassified
8 a
SLUDGETHICKENER (CLARIFIER)
Sludge concentration and removal, gravity, or dissolved air flotation
Possiblegeneration of methane from sludge; carryover of floating flammableliquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
9 a
SLUDGEPUMPING STATION DRY WELLS
Dry side of a sludge pumping station
Buildup of methane gas or flammable vapors
D
Entire dry well when physically separated from a wet well or separatestructures
Division 2
b C
Entire dry well when physically separated from a wet well or separatestructures
Unclassified
10 a
SLUDGESTORAGE WET WELLS, PITS, AND HOLDING TANKS
Retaining of sludge
Possiblegeneration of methane gas in explosive concentrations; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
11 a
SLUDGE-BLENDINGTANKS AND HOLDING WELLS
Retaining of sludge with some agitation
Possiblegeneration of methane gas in explosive concentrations; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
12
DEWATERINGBUILDINGS CONTAINING CENTRIFUGES, GRAVITY BELT THICKENERS, BELT AND VACUUMFILTERS, AND FILTER PRESSES
Removal of water from sludge and the conveyance of sludge cake
Accumulationof methane gas
C Entire room Unclassified
13 a
ENCLOSEDSLUDGE CAKE STORAGE
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulationof methane gas
C Entire room Unclassified
b
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulationof methane gas
D Entire room Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
14
INCINERATORS 2
AND INCINERATOR BUILDINGS
Conveying and burning of sludge cake
Fireboxexplosion NR NA Unclassified
15
HEATTREATMENT UNITS, LOW- OR HIGH-PRESSURE OXIDATION UNITS
Closed oxidation of sludge
None, other than in high-pressure systems
NR NA Unclassified
16 a
ANAEROBICDIGESTERS, BOTH FIXED ROOF AND FLOATING COVER Generation of sludge gas from digesting sludge
Leakage of gas from cover, piping, emergency relief valves, andappurtenances
Not enclosed, open to atmosphere
Tank interior; areas above and around digester cover; envelope 3 m (10 ft) above the highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall
Division 1
b
Envelope
4.6 m (15 ft) above Division 1 area over cover and
1.5 m (5 ft) beyond Division 1 area around tank walls
Division 2
c A
For digester tanks enclosed in a building: tank interior; entire area inside building
Division 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
d B
For digester tanks enclosed in a building: tank interior; areas above and around digester cover; envelope 3 m (10 ft) above highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall of digester tank
Division 1
eRemainingspace in enclosed area
Division 2
17 a
ANAEROBICDIGESTER CONTROL BUILDING
Storage, handling, or burning of sludge gas
Leaking and ignition of sludge gas
A Entire building Division 1
b BEnclosed areas that contain gas-handling equipment
Division 2
c CPhysicallyseparated from gas-handling equipment
Unclassified
18 a
DIGESTER GAS-PROCESSING ROOMS
Gas compression, handling, and processing
Sludge gas ignition A Entire room Division 1
b B Division 2
c BWithin 1.5 m (5 ft) of equipment
Division 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
19
ANAEROBICDIGESTER GAS STORAGE
Storage of sludge gas
Gas storage piping and handling
NNV
Within a 3 m (10 ft) envelope of tanks, valves, and appurtenances
Division 1
20 a
WASTE
GAS
BURNERS
Combusting excess gas
Gas piping and appurtenances NA
Within 3 m (10 ft) envelope of all fixtures, appurtenances, and housing
Division 1
b
Envelope
4.6 m (19 ft) above Division 1 envelope and 1.5 m (5 ft) on all sides
Division 2
21
CHLORINEOXIDATION UNITS
Chlorine reaction with sludge
Chlorine is a very strong oxidizing agent
NR NA Unclassified
22 a
UNDERGROUND(PIPING) TUNNELS CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of gas, sludge, water, air, and steam via piping; also might contain power cable and conduit
Ignition of natural gas or sludge gases
DWithin 3 m (10 ft) of valves and appurtenances
Division 1
b Entire tunnel Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
c C
Areas within 3 m (10 ft) of valves, meters, gas check valves, condensate traps, and other piping appurtenances
d Areas beyond 3 m (10 ft) Unclassified
23
UNDERGROUND(PIPING) TUNNELS NOT CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of sludge, water, air, and steam piping; also might contain power cable and conduit
NA NR NA Unclassified
24 a
COMPOSTINGPILES
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials canself-ignite)
D Enclosed area Division 2
b C Unclassified
25 a
IN-VESSELCOMPOSTING
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials canself-ignite)
As required by process
If enclosed, interior of reactor vessel plus a 3 m (10 ft) envelope around reactor vessel
Division 2
b Areas beyond 3 m (10 ft) Unclassified
26 a
ODOR-CONTROLSYSTEM AREAS Areas physically separated from processes that house systemshandling flammable gases
Leakage and ignition of process gases and vapors
D Entire area if enclosed Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
b C
Areas within 0.9 m (3 ft) of leakage sources such as fans, dampers, flexibleconnections, flanges, pressurized unwelded ductwork, and odor-controlvessels
Division 2
c Areas beyond 0.9 m (3 ft) Unclassified
dNot enclosed, open toatmosphere
Areas within 0.9 m (3 ft) of leakage sources such as fans, dampers, flexible connections,flanges, pressurized unwelded ductwork, and odor-controlvessels
Division 2
e Areas beyond 0.9 m (3 ft) Unclassified
f
Odor control systemsconnected to processes that do not generate flammable concentrations ofgases or vapors
NA NR NA Unclassified
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
27
PUMPING OF DRAINAGE FROM DIGESTED SLUDGE-
DEWATERING PROCESSES
Pumping of centrate, filtrate, leachate, drying beds, and so forth
NA NR NA Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.(2) Row and Line columns are used to refer to the specific figures in A.6.2 and for specific requirements for each location and function.
(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.FAS: Fire alarm system.
FDS: Fire detection system.
FE: Portable fire extinguisher.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NNV: Not normally ventilated.
NR: No requirement.
Footnotes:1The area beyond the envelope is unclassified.
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2See NFPA 54, NFPA 82, and NFPA 85.3These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
Table 6.2(b) Solids Treatment Processes — Sludge Drying
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
1 aSLUDGE-DRYING PROCESSES 3
Potential for ignition of dust
NR
If exposed to combustible particulate solids, entire room 4
Division 1
NC(Cin witNFNFNFNF
b NR
Areas within equipment processing combustible particulate solids
Division 1
c NR
Areas within 3 m (10 ft) of equipment processing combustible particulatesolids
Division 2
d NR
Areasbeyond 3 m (10 ft) of equipment processing combustible particulatesolids
Unclassified
2 aDRIED SLUDGE STORAGE AREAS, IF ENCLOSED
Potential for ignition of dust
NR
If exposed to dried sludge, entire room 4
Division 1
NC(Cin witanNFNF
b NRAreas within tanks storing dried sludge
Division 1
c NR
Areas within 3 m (10 ft) of tanks storing dried sludge
Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
d NR
Areasbeyond 3 m (10 ft) of tanks storing dried sludge
Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space and, therefore, Table 9.1.1.4 also has no requirements.
(2) The following codes are used in this table:FAS: Fire alarm system.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
NEC: In accordance with NFPA 70.
NC: Noncombustible material.
NR: No requirement.
Footnotes:1For sludge-drying processes that use flammable or combustible liquids, ventilate in accordance with NFPA 30.2Or if acceptable to the authority having jurisdiction with classification in NFPA 499.3See NFPA 54, NFPA 85, NFPA 499, and NFPA 654. For sludge-drying processes that use flammable or combustible liquids, see NFPA 30.4The area beyond the envelope is unclassified.
Statement of Problem and Substantiation for Public Input
Table 6.2(a) Row 26Odor control systems may be located outdoors. Line a addresses systems that are enclosed, and it is not clear if line b and c apply only to enclosed systems. The recommendation is to add lines to specifically address outdoor systems. The recommendation is for Division 2 within 3 ft of leakage sources, consistent with existing line b and c.Odor control systems may be connected to processes that do not generate flammable concentrations of gases or vapors, such as aeration tanks or dewatering. Row 26 does not appear to apply to these systems as the descriptions in Row 26 imply that it only applies to systems where ignition of process gases is a hazard. The recommendation is to specifically list that electrical classification is not required for systems where flammable gases of vapors are not generated.
Submitter Information Verification
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Submitter Full Name: TOM BURGESSOrganization: ARCADISStreet Address: City:State: Zip: Submittal Date: Sun Mar 10 13:09:38 EDT 2013
Copyright Assignment
I, TOM BURGESS, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am TOM BURGESS, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 18-NFPA 820-2013 [ Section No. 6.2 ]
6.2 * Design and Construction.The design and construction of solids treatment processes shall conform to Table 6.2(a) and Table 6.2(b).
Table 6.2(a) was revised by a tentative interim amendment (TIA). See page1.Table 6.2(a) Solids Treatment Processes
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class I, Group D) 3
Cf
1
COARSE AND FINE SCREENINGS-
HANDLING BUILDINGS
Storage, conveying, or dewatering of screenings (no exposed flow of wastewater through building or area)
NA NR NA Unclassified NLF
2
GRIT-HANDLINGBUILDING
Storage, conveying, and dewatering of heavy small screenings and grit (no exposed flow of wastewater through building or area)
NA NR NA Unclassified NLF
3 a
SCUM-HANDLINGBUILDING OR AREA
Holding, dewatering, or storage
Possiblegrease or flammable liquids carryover
A Enclosedspace Division 2 N
LF
b B Unclassified
cNot enclosed, open to atmosphere
NA
4 a SCUM PITS
Buildup of vapors from flammable or combustible liquids
AEnclosed—entire space
Division 1 N
b B Division 2 NLF
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class I, Group D) 3
Cf
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 1
5 a
SCUM-PUMPINGAREAS
Pumping of scum, wet side of pumping station
Carryover of floating flammable liquids
AEnclosed—entire space
Division 1 N
b B Division 2 NLF
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 1
6 a
SCUM-PUMPINGAREAS
Pumping of scum, dry side of pumping station
Notsignificant D Enclosed
space Division 2 NLF
b C Unclassified
cNot enclosed, open to atmosphere
NA
7
SCUMINCINERATORS 2
Elimination of scum through burning
Fireboxexplosion from possible carryover of flammable scum
NR
Incineratorarea if separated from scum storage
Unclassified NLF
8 a
SLUDGETHICKENER (CLARIFIER)
Sludge concentration and removal, gravity, or dissolved air flotation
Possiblegeneration of methane from sludge;
carryover of floating flammable liquidsA Enclosed— entire space Division
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12 NC
H, FE, and CGD if enclosedb B
Division 2
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Unclassified NC, LC, or LFS
cNotenclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
Division 2
9 a
SLUDGEPUMPING STATION DRY WELLS
Dry side of a sludge pumping station
Buildup of methane gas or flammable vapors
D
Entire dry well when physically separated from a wet well or separatestructures
Division 2
b C
Entire dry well when physically separated from a wet well or separatestructures
Unclassifie
10 a
SLUDGESTORAGE WET WELLS, PITS, AND HOLDING TANKS
Retaining of sludge
Possiblegeneration of methane gas in explosive concentrations; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNotenclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
11 a
SLUDGE-BLENDINGTANKS AND HOLDING WELLS
Retaining of sludge with some agitation
Possiblegeneration of methane gas in explosive concentrations; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
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cNotenclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
12
DEWATERINGBUILDINGS CONTAINING CENTRIFUGES, GRAVITY BELT THICKENERS, BELT AND VACUUMFILTERS, AND FILTER PRESSES
Removal of water from sludge and the conveyance of sludge cake
Accumulationof methane gas
C Entire room Unclassifie
13 a
ENCLOSEDSLUDGE CAKE STORAGE
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulationof methane gas
C Entire room Unclassifie
b
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulationof methane gas
D Entire room Division 2
14
INCINERATORS 2
AND INCINERATOR BUILDINGS
Conveying and burning of sludge cake
Fireboxexplosion NR NA Unclassifie
15
HEATTREATMENT UNITS, LOW- OR HIGH-PRESSURE OXIDATION UNITS
Closed oxidation of sludge
None, other than in high-pressure systems
NR NA Unclassifie
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16 a
ANAEROBICDIGESTERS, BOTH FIXED ROOF AND FLOATING COVER Generation of sludge gas from digesting sludge
Leakage of gas from cover, piping, emergency relief valves, andappurtenances
Notenclosed, open to atmosphere
Tank interior; areas above and around digester cover; envelope 3 m (10 ft) above the highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall
Division 1
b
Envelope
4.6 m (15 ft) above Division 1 area over cover and
1.5 m (5 ft) beyond Division 1 area around tank walls
Division 2
c A
For digester tanks enclosed in a building: tank interior; entire area inside building
Division 1
d B
For digester tanks enclosed in a building: tank interior; areas above and around digester cover; envelope 3 m (10 ft) above highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall of digester tank
Division 1
eRemainingspace in enclosed area
Division 2
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17 a
ANAEROBICDIGESTER CONTROL BUILDING
Storage, handling, or burning of sludge gas
Leaking and ignition of sludge gas
A Entire building Division 1
b B
Enclosed areas that contain gas-handling equipment
Division 2
c CPhysicallyseparated from gas-handling equipment
Unclassifie
18 a
DIGESTER GAS-PROCESSING ROOMS
Gas compression, handling, and processing
Sludge gas ignition A Entire room Division 1
b B Division 2
c BWithin 1.5 m (5 ft) of equipment
Division 1
19
ANAEROBICDIGESTER GAS STORAGE
Storage of sludge gas
Gas storage piping and handling
NNV
Within a 3 m (10 ft) envelope of tanks, valves, and appurtenances
Division 1
20 a
WASTE
GAS
BURNERS
Combusting excess gas
Gas piping and appurtenances NA
Within 3 m (10 ft) envelope of all fixtures, appurtenances, and housing
Division 1
b
Envelope
4.6 m (19 ft) above Division 1 envelope and 1.5 m (5 ft) on all sides
Division 2
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21
CHLORINEOXIDATION UNITS
Chlorine reaction with sludge
Chlorine is a very strong oxidizing agent
NR NA Unclassifie
22 a
UNDERGROUND(PIPING) TUNNELS CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of gas, sludge, water, air, and steam via piping; also might contain power cable and conduit
Ignition of natural gas or sludge gases
DWithin 3 m (10 ft) of valves and appurtenances
Division 1
b Entire tunnel Division 2
c C
Areas within 3 m (10 ft) of valves, meters, gas check valves, condensate traps, and other piping appurtenances
d Areas beyond 3 m (10 ft) Unclassifie
23
UNDERGROUND(PIPING) TUNNELS NOT CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of sludge, water, air, and steam piping; also might contain power cable and conduit
NA NR NA Unclassifie
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24 a
COMPOSTINGPILES
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials canself-ignite)
D Enclosed area Division 2
b C Unclassifie
25 a
IN-VESSELCOMPOSTING
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials canself-ignite)
As required by process
If enclosed, interior of reactor vessel plus a 3 m (10 ft) envelope around reactor vessel
Division 2
b Areas beyond 3 m (10 ft) Unclassifie
26 a
ODOR-CONTROLSYSTEM AREAS Areas physically separated from processes that house systemshandling flammable gases
Leakage and ignition of process gases and vapors
D Entire area if enclosed Division 2
b C
Areas within 0.9 m (3 ft) of leakage sources such as fans, dampers, flexibleconnections, flanges, pressurized unwelded ductwork, and odor-controlvessels
Division 2
c Areas beyond 0.9 m (3 ft) Unclassifie
27
PUMPING OF DRAINAGE FROM DIGESTED SLUDGE-
DEWATERING PROCESSES
Pumping of centrate, filtrate, leachate, drying beds, and so forth
NA NR NA Unclassifie
Notes:
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(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to the specific figures in A.6.2 and for specific requirements for each location and function.
(3) The following codes are used in this table:A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FAS: Fire alarm system.
FDS: Fire detection system.FE: Portable fire extinguisher.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.
NC: Noncombustible material.
NEC: In accordance with NFPA 70.NNV: Not normally ventilated.
NR: No requirement.
Footnotes:1The area beyond the envelope is unclassified.2See NFPA 54, NFPA 82, and NFPA 85.3These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
Table 6.2(b) Solids Treatment Processes — Sludge Drying
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
1 aSLUDGE-DRYING PROCESSES 3
Potential for ignition of dust
NR
If exposed to combustible particulate solids, entire room 4
Division 1
NC(Cin witNFNFNFNF
b NR
Areas within equipment processing combustible particulate solids
Division 1
c NR
Areas within 3 m (10 ft) of equipment processing combustible particulatesolids
Division 2
d NR
Areasbeyond 3 m (10 ft) of equipment processing combustible particulatesolids
Unclassified
2 aDRIED SLUDGE STORAGE AREAS, IF ENCLOSED
Potential for ignition of dust
NR
If exposed to dried sludge, entire room 4
Division 1
NC(Cin witanNFNF
b NRAreas within tanks storing dried sludge
Division 1
c NR
Areas within 3 m (10 ft) of tanks storing dried sludge
Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
d NR
Areasbeyond 3 m (10 ft) of tanks storing dried sludge
Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space and, therefore, Table 9.1.1.4 also has no requirements.
(2) The following codes are used in this table:FAS: Fire alarm system.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
NEC: In accordance with NFPA 70.
NC: Noncombustible material.
NR: No requirement.
Footnotes:1For sludge-drying processes that use flammable or combustible liquids, ventilate in accordance with NFPA 30.2Or if acceptable to the authority having jurisdiction with classification in NFPA 499.3See NFPA 54, NFPA 85, NFPA 499, and NFPA 654. For sludge-drying processes that use flammable or combustible liquids, see NFPA 30.4The area beyond the envelope is unclassified.
Additional Proposed Changes
File Name Description ApprovedTCDF-1989-820_Table_6.2_Row_8.pdf 1989 NFPA 820 Revisions
Statement of Problem and Substantiation for Public Input
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The area clasification for a sludge thickener is identical to primary sedimentation tanks, sludge storge tanks and oher locations with a significantly higher potential for flammable gases and vapors. While the potential for methane generation exists a Division 2 classification should provide adequate protection. Ventilation at 12 air changes per hour should allow an area to be unclasified as this will control the rate of methane generation even in the event of extended retention times. The reference to carry-over of floating flammable liquids should be deleted. This may have contributed to the current classification, and was added without substantiation in 1989 (log #63). With sludge being removed from the bottom of the process there is no potential for the carry-over of floating flammable liquids. If needed, to distinguish processes where there is the potential for carryover of flammable liquids an approach similar to Table 5.2 Rows 7 and 8 should be adopted, which seperates aeration basins based on the potential for carry-over of flammable liquids.
Submitter Information Verification
Submitter Full Name: TOM BURGESSOrganization: ARCADISStreet Address: City:State: Zip: Submittal Date: Fri May 03 09:22:14 EDT 2013
Copyright Assignment
I, TOM BURGESS, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am TOM BURGESS, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 21-NFPA 820-2013 [ Section No. 6.2 ]
6.2 * Design and Construction.The design and construction of solids treatment processes shall conform to Table 6.2(a) and Table 6.2(b).
Table 6.2(a) was revised by a tentative interim amendment (TIA). See page1.Table 6.2(a) Solids Treatment Processes
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
1
COARSE AND FINE SCREENINGS-
HANDLING BUILDINGS
Storage, conveying, or dewatering of screenings (no exposed flow of wastewater through building or area)
NA NR NA Unclassified
2
GRIT-HANDLINGBUILDING
Storage, conveying, and dewatering of heavy small screenings and grit (no exposed flow of wastewater through building or area)
NA NR NA Unclassified
3 a
SCUM-HANDLINGBUILDING OR AREA
Holding, dewatering, or storage
Possiblegrease or flammable liquids carryover
A Enclosedspace Division 2
b B Unclassified
cNot enclosed, open to atmosphere
NA
4 a SCUM PITS
Buildup of vapors from flammable or combustible liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 1
5 a
SCUM-PUMPINGAREAS
Pumping of scum, wet side of pumping station
Carryover of floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 1
6 a
SCUM-PUMPINGAREAS
Pumping of scum, dry side of pumping station
Not significant D Enclosedspace Division 2
b C Unclassified
cNot enclosed, open to atmosphere
NA
7
SCUMINCINERATORS 2
Elimination of scum through burning
Fireboxexplosion from possible carryover of flammable scum
NRIncineratorarea if separated from scum storage
Unclassified
8 a
SLUDGETHICKENER (CLARIFIER)
Sludge concentration and removal, gravity, or dissolved air flotation
Possiblegeneration of methane from sludge; carryover of floating flammableliquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
9 a
SLUDGEPUMPING STATION DRY WELLS
Dry side of a sludge pumping station
Buildup of methane gas or flammable vapors
D
Entire dry well when physically separated from a wet well or separatestructures
Division 2
b C
Entire dry well when physically separated from a wet well or separatestructures
Unclassified
10 a
SLUDGESTORAGE WET WELLS, PITS, AND HOLDING TANKS
Retaining of sludge
Possiblegeneration of methane gas in explosive concentrations; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
11 a
SLUDGE-BLENDINGTANKS AND HOLDING WELLS
Retaining of sludge with some agitation
Possiblegeneration of methane gas in explosive concentrations; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
12
DEWATERINGBUILDINGS CONTAINING CENTRIFUGES, GRAVITY BELT THICKENERS, BELT AND VACUUMFILTERS, AND FILTER PRESSES
Removal of water from sludge and the conveyance of sludge cake
Accumulationof methane gas
C Entire room Unclassified
13 a
ENCLOSEDSLUDGE CAKE STORAGE
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulationof methane gas
C Entire room Unclassified
b
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulationof methane gas
D Entire room Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
14
INCINERATORS 2
AND INCINERATOR BUILDINGS
Conveying and burning of sludge cake
Fireboxexplosion NR NA Unclassified
15
HEATTREATMENT UNITS, LOW- OR HIGH-PRESSURE OXIDATION UNITS
Closed oxidation of sludge
None, other than in high-pressure systems
NR NA Unclassified
16 a
ANAEROBICDIGESTERS, BOTH FIXED ROOF AND FLOATING COVER Generation of sludge gas from digesting sludge
Leakage of gas from cover, piping, emergency relief valves, andappurtenances
Not enclosed, open to atmosphere
Tank interior; areas above and around digester cover; envelope 3 m (10 ft) above the highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall
Division 1
b
Envelope
4.6 m (15 ft) above Division 1 area over cover and
1.5 m (5 ft) beyond Division 1 area around tank walls
Division 2
c A
For digester tanks enclosed in a building: tank interior; entire area inside building
Division 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
d B
For digester tanks enclosed in a building: tank interior; areas above and around digester cover; envelope 3 m (10 ft) above highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall of digester tank
Division 1
eRemainingspace in enclosed area
Division 2
17 a
ANAEROBICDIGESTER CONTROL BUILDING
Storage, handling, or burning of sludge gas
Leaking and ignition of sludge gas
A Entire building Division 1
b BEnclosed areas that contain gas-handling equipment
Division 2
c CPhysicallyseparated from gas-handling equipment
Unclassified
18 a
DIGESTER GAS-PROCESSING ROOMS
Gas compression, handling, and processing
Sludge gas ignition A Entire room Division 1
b B Division 2
c BWithin 1.5 m (5 ft) of equipment
Division 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
19
ANAEROBICDIGESTER GAS STORAGE
Storage of sludge gas
Gas storage piping and handling
NNV
Within a 3 m (10 ft) envelope of tanks, valves, and appurtenances
Division 1
20 a
WASTE
GAS
BURNERS
Combusting excess gas
Gas piping and appurtenances NA
Within 3 m (10 ft) envelope of all fixtures, appurtenances, and housing
Division 1
b
Envelope
4.6 m (19 ft) above Division 1 envelope and 1.5 m (5 ft) on all sides
Division 2
21
CHLORINEOXIDATION UNITS
Chlorine reaction with sludge
Chlorine is a very strong oxidizing agent
NR NA Unclassified
22 a
UNDERGROUND(PIPING) TUNNELS CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of gas, sludge, water, air, and steam via piping; also might contain power cable and conduit
Ignition of natural gas or sludge gases
DWithin 3 m (10 ft) of valves and appurtenances
Division 1
b Entire tunnel Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
c C
Areas within 3 m (10 ft) of valves, meters, gas check valves, condensate traps, and other piping appurtenances
d Areas beyond 3 m (10 ft) Unclassified
23
UNDERGROUND(PIPING) TUNNELS NOT CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of sludge, water, air, and steam piping; also might contain power cable and conduit
NA NR NA Unclassified
24 a
COMPOSTINGPILES
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials canself-ignite)
D Enclosed area Division 2
b C Unclassified
25 a
IN-VESSELCOMPOSTING
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials canself-ignite)
As required by process
If enclosed, interior of reactor vessel plus a 3 m (10 ft) envelope around reactor vessel
Division 2
b Areas beyond 3 m (10 ft) Unclassified
26 a
ODOR-CONTROLSYSTEM AREAS Areas physically separated from processes that house systems
handling flammable
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handling exhaust gases from those processes
Leakageand ignition of process gases and vapors
DEntirearea if enclosed
Division2
NC, LC, or LFS
CGD, FDS, and FE
b C
Areas within 0.9 m (3 ft) of leakage sources such as fans, dampers, flexibleconnections, flanges, pressurized unwelded ductwork, and odor-controlvessels
Division 2
cAreasbeyond 0.9 m (3 ft)
Unclassified
27
PUMPING OF DRAINAGE FROM DIGESTED SLUDGE-
DEWATERING PROCESSES
Pumping of centrate, filtrate, leachate, drying beds, and so forth
NA NR NA UnclassifiedNCLCor LFS
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to the specific figures in A.6.2 and for specific requirements for each location and function.
(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
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CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FAS: Fire alarm system.
FDS: Fire detection system.
FE: Portable fire extinguisher.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.
NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NNV: Not normally ventilated.
NR: No requirement.Footnotes:1The area beyond the envelope is unclassified.2See NFPA 54, NFPA 82, and NFPA 85.3These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
Table 6.2(b) Solids Treatment Processes — Sludge Drying
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
1 aSLUDGE-DRYING PROCESSES 3
Potential for ignition of dust
NR
If exposed to combustible particulate solids, entire room 4
Division 1
NC(Cin witNFNFNFNF
b NR
Areas within equipment processing combustible particulate solids
Division 1
c NR
Areas within 3 m (10 ft) of equipment processing combustible particulatesolids
Division 2
d NR
Areasbeyond 3 m (10 ft) of equipment processing combustible particulatesolids
Unclassified
2 aDRIED SLUDGE STORAGE AREAS, IF ENCLOSED
Potential for ignition of dust
NR
If exposed to dried sludge, entire room 4
Division 1
NC(Cin witanNFNF
b NRAreas within tanks storing dried sludge
Division 1
c NR
Areas within 3 m (10 ft) of tanks storing dried sludge
Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
d NR
Areasbeyond 3 m (10 ft) of tanks storing dried sludge
Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space and, therefore, Table 9.1.1.4 also has no requirements.
(2) The following codes are used in this table:FAS: Fire alarm system.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
NEC: In accordance with NFPA 70.
NC: Noncombustible material.
NR: No requirement.
Footnotes:1For sludge-drying processes that use flammable or combustible liquids, ventilate in accordance with NFPA 30.2Or if acceptable to the authority having jurisdiction with classification in NFPA 499.3See NFPA 54, NFPA 85, NFPA 499, and NFPA 654. For sludge-drying processes that use flammable or combustible liquids, see NFPA 30.4The area beyond the envelope is unclassified.
Statement of Problem and Substantiation for Public Input
This terminology accurately describes the intended function for the "Location and Function" column.
Submitter Information Verification
Submitter Full Name: RALPH THOMASOrganization: METRO COUNCIL ENVIROMENTAL SVCStreet Address: City: State:Zip: Submittal Date: Tue May 14 17:25:41 EDT 2013
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Copyright Assignment
I, RALPH THOMAS, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am RALPH THOMAS, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 22-NFPA 820-2013 [ Section No. 6.2 ]
Note: This Proposal originates from Tentative Interim Amendment 820-12-1 (TIA 1025) issued by the Standards Council on August 11, 2011.
1. Revise Table 6.2 (a) Row 12 and add a new Row 13 (renumber subsequent Rows) as follows: (see the uploaded balloted file which as the tables in place)
6.2 * Design and Construction.The design and construction of solids treatment processes shall conform to Table 6.2(a) and Table 6.2(b).
Table 6.2(a) was revised by a tentative interim amendment (TIA). See page1.Table 6.2(a) Solids Treatment Processes
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
1
COARSE AND FINE SCREENINGS-
HANDLING BUILDINGS
Storage, conveying, or dewatering of screenings (no exposed flow of wastewater through building or area)
NA NR NA Unclassified
2
GRIT-HANDLINGBUILDING
Storage, conveying, and dewatering of heavy small screenings and grit (no exposed flow of wastewater through building or area)
NA NR NA Unclassified
3 a
SCUM-HANDLINGBUILDING OR AREA
Holding, dewatering, or storage
Possiblegrease or flammable liquids carryover
A Enclosedspace Division 2
b B Unclassified
cNot enclosed, open to atmosphere
NA
4 a SCUM PITS
Buildup of vapors from flammable or combustible liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 1
5 a
SCUM-PUMPINGAREAS
Pumping of scum, wet side of pumping station
Carryover of floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel 1
6 a
SCUM-PUMPINGAREAS
Pumping of scum, dry side of pumping station
Not significant D Enclosedspace Division 2
b C Unclassified
cNot enclosed, open to atmosphere
NA
7
SCUMINCINERATORS 2
Elimination of scum through burning
Fireboxexplosion from possible carryover of flammable scum
NRIncineratorarea if separated from scum storage
Unclassified
8 a
SLUDGETHICKENER (CLARIFIER)
Sludge concentration and removal, gravity, or dissolved air flotation
Possiblegeneration of methane from sludge; carryover of floating flammableliquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
9 a
SLUDGEPUMPING STATION DRY WELLS
Dry side of a sludge pumping station
Buildup of methane gas or flammable vapors
D
Entire dry well when physically separated from a wet well or separatestructures
Division 2
b C
Entire dry well when physically separated from a wet well or separatestructures
Unclassified
10 a
SLUDGESTORAGE WET WELLS, PITS, AND HOLDING TANKS
Retaining of sludge
Possiblegeneration of methane gas in explosive concentrations; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
11 a
SLUDGE-BLENDINGTANKS AND HOLDING WELLS
Retaining of sludge with some agitation
Possiblegeneration of methane gas in explosive concentrations; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls 1
12
DEWATERINGBUILDINGS CONTAINING CENTRIFUGES, GRAVITY BELT THICKENERS, BELT AND VACUUMFILTERS, AND FILTER PRESSES
Removal of water from sludge and the conveyance of sludge cake
Accumulationof methane gas
C Entire room Unclassified
13 a
ENCLOSEDSLUDGE CAKE STORAGE
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulationof methane gas
C Entire room Unclassified
b
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulationof methane gas
D Entire room Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
14
INCINERATORS 2
AND INCINERATOR BUILDINGS
Conveying and burning of sludge cake
Fireboxexplosion NR NA Unclassified
15
HEATTREATMENT UNITS, LOW- OR HIGH-PRESSURE OXIDATION UNITS
Closed oxidation of sludge
None, other than in high-pressure systems
NR NA Unclassified
16 a
ANAEROBICDIGESTERS, BOTH FIXED ROOF AND FLOATING COVER Generation of sludge gas from digesting sludge
Leakage of gas from cover, piping, emergency relief valves, andappurtenances
Not enclosed, open to atmosphere
Tank interior; areas above and around digester cover; envelope 3 m (10 ft) above the highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall
Division 1
b
Envelope
4.6 m (15 ft) above Division 1 area over cover and
1.5 m (5 ft) beyond Division 1 area around tank walls
Division 2
c A
For digester tanks enclosed in a building: tank interior; entire area inside building
Division 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
d B
For digester tanks enclosed in a building: tank interior; areas above and around digester cover; envelope 3 m (10 ft) above highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall of digester tank
Division 1
eRemainingspace in enclosed area
Division 2
17 a
ANAEROBICDIGESTER CONTROL BUILDING
Storage, handling, or burning of sludge gas
Leaking and ignition of sludge gas
A Entire building Division 1
b BEnclosed areas that contain gas-handling equipment
Division 2
c CPhysicallyseparated from gas-handling equipment
Unclassified
18 a
DIGESTER GAS-PROCESSING ROOMS
Gas compression, handling, and processing
Sludge gas ignition A Entire room Division 1
b B Division 2
c BWithin 1.5 m (5 ft) of equipment
Division 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
19
ANAEROBICDIGESTER GAS STORAGE
Storage of sludge gas
Gas storage piping and handling
NNV
Within a 3 m (10 ft) envelope of tanks, valves, and appurtenances
Division 1
20 a
WASTE
GAS
BURNERS
Combusting excess gas
Gas piping and appurtenances NA
Within 3 m (10 ft) envelope of all fixtures, appurtenances, and housing
Division 1
b
Envelope
4.6 m (19 ft) above Division 1 envelope and 1.5 m (5 ft) on all sides
Division 2
21
CHLORINEOXIDATION UNITS
Chlorine reaction with sludge
Chlorine is a very strong oxidizing agent
NR NA Unclassified
22 a
UNDERGROUND(PIPING) TUNNELS CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of gas, sludge, water, air, and steam via piping; also might contain power cable and conduit
Ignition of natural gas or sludge gases
DWithin 3 m (10 ft) of valves and appurtenances
Division 1
b Entire tunnel Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
c C
Areas within 3 m (10 ft) of valves, meters, gas check valves, condensate traps, and other piping appurtenances
d Areas beyond 3 m (10 ft) Unclassified
23
UNDERGROUND(PIPING) TUNNELS NOT CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of sludge, water, air, and steam piping; also might contain power cable and conduit
NA NR NA Unclassified
24 a
COMPOSTINGPILES
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials canself-ignite)
D Enclosed area Division 2
b C Unclassified
25 a
IN-VESSELCOMPOSTING
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials canself-ignite)
As required by process
If enclosed, interior of reactor vessel plus a 3 m (10 ft) envelope around reactor vessel
Division 2
b Areas beyond 3 m (10 ft) Unclassified
26 a
ODOR-CONTROLSYSTEM AREAS Areas physically separated from processes that house systemshandling flammable gases
Leakage and ignition of process gases and vapors
D Entire area if enclosed Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1,
3
Extent of Classified
Area
NEC -ArElectrica
Classificat(All ClassGroup D) 3
b C
Areas within 0.9 m (3 ft) of leakage sources such as fans, dampers, flexibleconnections, flanges, pressurized unwelded ductwork, and odor-controlvessels
Division 2
c Areas beyond 0.9 m (3 ft) Unclassified
27
PUMPING OF DRAINAGE FROM DIGESTED SLUDGE-
DEWATERING PROCESSES
Pumping of centrate, filtrate, leachate, drying beds, and so forth
NA NR NA Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to the specific figures in A.6.2 and for specific requirements for each location and function.
(3) The following codes are used in this table:A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9.
C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FAS: Fire alarm system.
FDS: Fire detection system.FE: Portable fire extinguisher.
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FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NNV: Not normally ventilated.
NR: No requirement.
Footnotes:1The area beyond the envelope is unclassified.2See NFPA 54, NFPA 82, and NFPA 85.3These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
Table 6.2(b) Solids Treatment Processes — Sludge Drying
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
1 aSLUDGE-DRYING PROCESSES 3
Potential for ignition of dust
NR
If exposed to combustible particulate solids, entire room 4
Division 1
NC(Cin witNFNFNFNF
b NR
Areas within equipment processing combustible particulate solids
Division 1
c NR
Areas within 3 m (10 ft) of equipment processing combustible particulatesolids
Division 2
d NR
Areasbeyond 3 m (10 ft) of equipment processing combustible particulatesolids
Unclassified
2 aDRIED SLUDGE STORAGE AREAS, IF ENCLOSED
Potential for ignition of dust
NR
If exposed to dried sludge, entire room 4
Division 1
NC(Cin witanNFNF
b NRAreas within tanks storing dried sludge
Division 1
c NR
Areas within 3 m (10 ft) of tanks storing dried sludge
Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
d NR
Areasbeyond 3 m (10 ft) of tanks storing dried sludge
Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space and, therefore, Table 9.1.1.4 also has no requirements.
(2) The following codes are used in this table:FAS: Fire alarm system.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
NEC: In accordance with NFPA 70.
NC: Noncombustible material.
NR: No requirement.
Footnotes:1For sludge-drying processes that use flammable or combustible liquids, ventilate in accordance with NFPA 30.2Or if acceptable to the authority having jurisdiction with classification in NFPA 499.3See NFPA 54, NFPA 85, NFPA 499, and NFPA 654. For sludge-drying processes that use flammable or combustible liquids, see NFPA 30.4The area beyond the envelope is unclassified.
Additional Proposed Changes
File Name Description ApprovedProposed_TIA_1025_820_.docx Balloted TIA
Statement of Problem and Substantiation for Public Input
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Table 6.2(a) Row 12 has been causing confusion to industry. This TIA seeks to eliminate confusion of this requirement and reduce compliance burdens. Justification for reducing from Class 1 Division 1: Wastewater treatment dewatering operations are one of the final stages of treatment and
have a reduced risk of fire or explosion hazards. Row 12 of Table 6.2(a) recognizes this reduced hazard and the operational area is “unclassified” in Line b. Additionally, stored dewatered sludge cake (a semi-solid product of sludge dewatering) has a reduced (but not entirely absent) risk of fire or explosion from an accumulation of methane gas. Classifying storage areas with dewatered sludge cake as a Class I Division 1 location
creates an unnecessary burden on plant operators in an area with a minimal risk for fire or explosion from the accumulation of methane gas. In addition, line “b” refers to the “conveyance of thickened sludge.” While this occurs in the actual dewatering area it does not typically occur in storage areas. Sludge thickening and storage operations are covered in Rows 8, 9, 10 and 11 and are appropriately classified in these Rows. Row 12 line b already considers the risk for the actual dewatering operation to be minimal as evidenced by the “unclassified” status of this operation when 6 air changes per hour (ACH) are provided for the location.Considering the reduced risk of methane gas during sludge cake storage this operation is
more appropriately classified as a Class I Division 2 location. It is recognized that the primary hazard in a sludge cake storage area is the accumulation and ignition of combustible dust. This hazard is addressed in Table 6.2(b) of NFPA 820. However, where different types of material — such as a flammable gas and a combustible dust — may exist in a process or location, the area must be classified as both a Class I and a Class II location, and protection must be provided for both hazards. Classification is necessary and appropriate for a sludge cake storage location; however, the classification must reflect the real and potential risk of flammable gas ignition and ensure a level of protection that mitigates the minimized risk in this location. While a reduced level of protection a designation of Class I Division 2 for sludge cake storage areas would accomplish this risk mitigation.As background, Class I, Division 2 locations, boxes, fittings, and joints are not required to
be explosionproof when they contain no arcing devices; or for lighting outlets or enclosures containing non-arcing devices (such as solid-state relays, solenoids, and control transformers), if the maximum operating temperature of any exposed surface does not exceed 80 percent of the ignition temperature. However, when a general-purpose enclosure is installed using rigid or intermediate metal
conduit, a bonding jumper with proper fittings or bonding-type locknuts is required to be used between the enclosure and the raceway to ensure adequate bonding from the hazardous area to the point of grounding at the service equipment or separately derived system. See 501.30 for grounding and bonding requirements.
Where necessary, limited flexibility is provided through use of flexible metal conduit, liquidtight flexible conduit, and extra-hard-usage flexible cord, and the fittings of this type are not required to be specifically approved for Class I locations. Also, where flexible conduit or liquidtight flexible conduit is used, internal or external bonding jumpers with proper fittings must be provided in accordance with 501.30(B), unless liquidtight flexible conduit is installed under the conditions described in 501.30(B), Exception. Section 501.10(B)(1) permits a variety of cable types, cable tray systems, enclosed
gasketed wireways, and enclosed gasketed busways, each with associated fittings. These are not required to be specifically listed or labeled for Class I, Division 2 locations. For example, if Type ITC or MC cable is used, neither the cable nor the fittings need to be listed for use in hazardous locations.Providing this electrical equipment installation flexibility is important to the design and
operation of wastewater treatment facilities, specifically sludge cake storage locations.Further editing was performed to clarify enclosed sludge cake storage areas and to
distinguish these areas from dewatering buildings. As a consequence, another line was added, now Row 13 Line a, which classifies enclosed sludge cake storage areas with type C ventilation as UNCLASSIFIED. Emergency Nature: Treating sludge storage as a Class 1 Division 1 electrical hazard is
considered to be an expensive and unnecessary requirement for wastewater treatment facility designers and operators. Revising Row 12 of Table 6.2(a) helps remove confusion, while reducing to a hazard classification of Class 1 Division 2 which will adequately
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mitigate the risk of fire or explosion. A Div 2 classification is determined to provide adequate protection and more flexibility for designers and operators.
Submitter Information Verification
Submitter Full Name: TC on WAA-AAAOrganization: TC on Wastewater Treatment PlantsStreet Address:City: State: Zip:Submittal Date: Mon Jun 17 13:20:12 EDT 2013
Copyright Assignment
I, TC on WAA-AAA, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am TC on WAA-AAA, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 5-NFPA 820-2013 [ Section No. 6.2 ]
6.2* Design and Construction. The design and construction of solids treatment processes shall conform to Table 6.2(a) and Table 6.2(b).
Table 6.2(a) was revised by a tentative interim amendment (TIA). See page 1.Table 6.2(a) Solids Treatment Processes
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
1
COARSE AND FINE SCREENINGS-
HANDLING BUILDINGS
Storage, conveying, or dewatering of screenings (no exposed flow ofwastewater through building or area)
NA NR NA Unclassified
2
GRIT-HANDLING BUILDING
Storage, conveying, and dewatering of heavy small screenings andgrit (no exposed flow of wastewater through building or area)
NA NR NA Unclassified
3 a
SCUM-HANDLING BUILDING OR AREA
Holding, dewatering, or storage
Possible grease orflammable liquids carryover
A Enclosed space Division 2
b B Unclassified
cNot enclosed, open to atmosphere
NA
4 a SCUM PITS
Buildup of vapors from flammable or combustible liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel1
5 a
SCUM-PUMPING AREAS
Pumping of scum, wet side of pumping station
Carryover of floatingflammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Within a 3 m (10 ft) envelope around equipment and open channel1
6 a
SCUM-PUMPING AREAS
Pumping of scum, dry side of pumping station
Not significant D Enclosed space Division 2
b C Unclassified
cNot enclosed, open to atmosphere
NA
7
SCUM INCINERATORS2
Elimination of scum throughburning
Firebox explosion from possible carryover of flammablescum
NRIncinerator area if separated from scum storage
Unclassified
8 a
SLUDGE THICKENER (CLARIFIER)
Sludge concentration and removal, gravity, or dissolved airflotation
Possible generation of methane from sludge; carryover offloating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls1
9 a
SLUDGE PUMPING STATION DRY WELLS
Dry side of a sludge pumping station
Buildup of methane gasor flammable vapors
D
Entire dry well when physically separated from a wet well orseparate structures
Division 2
b C
Entire dry well when physically separated from a wet well orseparate structures
Unclassified
10 a
SLUDGE STORAGE WET WELLS, PITS, AND HOLDING TANKS
Retaining of sludge
Possible generation of methane gas in explosive concentrations;carryover of floating flammable liquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls1
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
11 a
SLUDGE-BLENDING TANKS AND HOLDING WELLS
Retaining of sludge with some agitation
Possible generation ofmethane gas in explosive concentrations; carryover of floating flammableliquids
A Enclosed—entire space Division 1
b B Division 2
cNot enclosed, open to atmosphere
Envelope 0.46 m (18 in.) above water surface and
3 m (10 ft) horizontally from wetted walls1
12
DEWATERING BUILDINGS CONTAINING CENTRIFUGES, GRAVITY BELTTHICKENERS, BELT AND VACUUM FILTERS, AND FILTER PRESSES
Removal of water from sludge and the conveyance of sludge cake
Accumulation of methane gas
C Entire room Unclassified
13 a
ENCLOSED SLUDGE CAKE STORAGE
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulation of methane gas
C Entire room Unclassified
b
Storage of dewatered sludge cake and conveyance of sludge cake
Accumulation of methane gas
D Entire room Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
14
INCINERATORS2
AND INCINERATOR BUILDINGS
Conveying and burning of sludge cake
Firebox explosion NR NA Unclassified
15
HEAT TREATMENT UNITS, LOW- OR HIGH-PRESSURE OXIDATION UNITS
Closed oxidation of sludge
None, other than in high-pressure systems
NR NA Unclassified
16 a
ANAEROBIC DIGESTERS, BOTH FIXED ROOF AND FLOATING COVERGeneration of sludge gas from digesting sludge
Leakage of gas fromcover, piping, emergency relief valves, and appurtenances
Not enclosed, open toatmosphere
Tank interior; areas above and around digester cover; envelope 3 m (10 ft) above the highest point of cover, when cover is at its maximumelevation, and 1.5 m (5 ft) from any wall
Division 1
b
Envelope
4.6 m (15 ft) above Division 1 area over cover and
1.5 m (5 ft) beyond Division 1 area around tank walls
Division 2
c A
For digester tanks enclosed in a building: tank interior;entire area inside building
Division 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
d B
For digester tanks enclosed in a building: tank interior; areas above and around digester cover; envelope 3 m (10 ft) above highest point of cover, when cover is at its maximum elevation, and 1.5 m (5 ft) from any wall of digester tank
Division 1
eRemaining space in enclosed area
Division 2
17 a
ANAEROBIC DIGESTER CONTROL BUILDING
Storage, handling, or burning of sludge gas
Leaking and ignition ofsludge gas
A Entire building Division 1
b BEnclosed areas that contain gas-handling equipment
Division 2
c CPhysically separated from gas-handling equipment
Unclassified
18 a
DIGESTER GAS-PROCESSING ROOMS
Gas compression, handling, and processing
Sludge gasignition A Entire room Division 1
b B Division 2
c BWithin 1.5 m (5 ft) of equipment
Division 1
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
19
ANAEROBIC DIGESTER GAS STORAGE
Storage of sludge gas
Gas storage piping and handling
NNV
Within a 3 m (10 ft) envelope of tanks, valves, andappurtenances
Division 1
20 a
WASTE
GAS
BURNERS
Combusting excess gas
Gas piping and appurtenances NA
Within 3 m (10 ft) envelope of all fixtures, appurtenances, and housing
Division 1
b
Envelope
4.6 m (19 ft) above Division 1 envelope and 1.5 m (5 ft) on all sides
Division 2
21
CHLORINE OXIDATION UNITS
Chlorine reaction with sludge
Chlorine is a very strong oxidizing agent
NR NA Unclassified
22 a
UNDERGROUND (PIPING) TUNNELS CONTAINING NATURAL GAS PIPING ORSLUDGE GAS PIPING
Transmission of gas, sludge, water, air, and steam via piping; also might contain power cable and conduit
Ignition of natural gas or sludge gases
DWithin 3 m (10 ft) of valves and appurtenances
Division 1
b Entire tunnel Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
c C
Areas within 3 m (10 ft) of valves, meters, gas check valves,condensate traps, and other piping appurtenances
d Areas beyond 3 m (10 ft) Unclassified
23
UNDERGROUND (PIPING) TUNNELS NOT CONTAINING NATURAL GAS PIPING OR SLUDGE GAS PIPING
Transmission of sludge, water, air, and steam piping; also mightcontain power cable and conduit
NA NR NA Unclassified
24 a
COMPOSTING PILES
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials can self-ignite)
D Enclosed area Division 2
b C Unclassified
25 a
IN-VESSEL COMPOSTING
Aerobic sludge reduction
Liberation of ammonia and toxic gas (composting materials can self-ignite)
As required by process
If enclosed, interior of reactor vessel plus a 3 m (10 ft) envelope around reactor vessel
Division 2
b Areas beyond 3 m (10 ft) Unclassified
26 a
ODOR-CONTROL SYSTEM AREAS Areas physically separated fromprocesses that house systems handling flammable gases
Leakage and ignition ofprocess gases and vapors
D Entire area if enclosed Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation1,
3
Extent of Classified
Area
NEC -Area Electrical
Classification(All Class I, Group D)3
b C
Areas within 0.9 m (3 ft) of leakage sources such as fans,dampers, flexible connections, flanges, pressurized unwelded ductwork, andodor-control vessels
Division 2
c Areas beyond 0.9 m (3 ft) Unclassified
27
PUMPING OF DRAINAGE FROM DIGESTED SLUDGE-
DEWATERING PROCESSES
Pumping of centrate, filtrate, leachate, drying beds, and soforth
NA NR NA Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no requirements.
(2) Row and Line columns are used to refer to the specific figures in A.6.2 and for specific requirements for each location and function.(3) The following codes are used in this table:
A: No ventilation or ventilated at less than 12 air changes per hour.
B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9.1.2.
C: Continuously ventilated at six 6 air changes per hour or in accordance with Chapter 9.1.2.
CGD: Combustible gas detection system.
D: No ventilation or ventilated at less than six air changes per hour.
FAS: Fire alarm system.FDS: Fire detection system.
FE: Portable fire extinguisher.
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FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
LC: Limited-combustible material.
LFS: Low flame spread material.
NA: Not applicable.NC: Noncombustible material.
NEC: In accordance with NFPA 70.
NNV: Not normally ventilated.
NR: No requirement.
Footnotes:1The area beyond the envelope is unclassified.2See NFPA 54, NFPA 82, and NFPA 85.3These unit processes use corrosive chemicals that can have a deteriorating effect on conductors and equipment. Electrical equipment shall be identified for use in the operating environment.
Table 6.2(b) Solids Treatment Processes — Sludge Drying
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
1 aSLUDGE-DRYING PROCESSES 3
Potential for ignition of dust
NR
If exposed to combustible particulate solids, entire room 4
Division 1
NC(Cin witNFNFNFNF
b NR
Areas within equipment processing combustible particulate solids
Division 1
c NR
Areas within 3 m (10 ft) of equipment processing combustible particulatesolids
Division 2
d NR
Areasbeyond 3 m (10 ft) of equipment processing combustible particulatesolids
Unclassified
2 aDRIED SLUDGE STORAGE AREAS, IF ENCLOSED
Potential for ignition of dust
NR
If exposed to dried sludge, entire room 4
Division 1
NC(Cin witanNFNF
b NRAreas within tanks storing dried sludge
Division 1
c NR
Areas within 3 m (10 ft) of tanks storing dried sludge
Division 2
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Row Line Location and Function
Fire and Explosion
HazardVentilation 1
Extent of Classified
Area
NEC -AreaElectrical
Classification (All Class II, Group G) 2
Cfo
S
d NR
Areasbeyond 3 m (10 ft) of tanks storing dried sludge
Unclassified
Notes:
(1) The NR designation in the ventilation column indicates that no ventilation requirements are established for the space and, therefore, Table 9.1.1.4 also has no requirements.
(2) The following codes are used in this table:FAS: Fire alarm system.
FSS: Fire suppression system (e.g., automatic sprinkler, water spray, foam, gaseous, or dry chemical).
H: Hydrant protection in accordance with 7.2.4.
NEC: In accordance with NFPA 70.
NC: Noncombustible material.
NR: No requirement.
Footnotes:1For sludge-drying processes that use flammable or combustible liquids, ventilate in accordance with NFPA 30.2Or if acceptable to the authority having jurisdiction with classification in NFPA 499.3See NFPA 54, NFPA 85, NFPA 499, and NFPA 654. For sludge-drying processes that use flammable or combustible liquids, see NFPA 30.4The area beyond the envelope is unclassified.
Additional Proposed Changes
File Name Description Approved820_Rainville_4_820-2008.pdf Cover Sheet
Statement of Problem and Substantiation for Public Input
Per 9.1.1.4, ventilation requirements not addressed by Chapters 4, 5, and 6 shall meet the requirements of 9.1.1.4. If I correctly understand that the requirements of Section 9.3, Ventilation Criteria apply only to Table 9.1.1.4 then the only alternative requirements in Chapter 9 as implied by the current text "or in accordance with Chapter 9" in the Notes of Tables 4.2, 5.2, and 6.2(a) would appear to be Section 9.1.2. Proposed change will avoid confusion and misapplication of Section 9.3 to the requirements of Table 4.2, 5.2, and 6.2(a).
Submitter Information Verification
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Submitter Full Name: Charles RainvilleOrganization: Hallam-ICSStreet Address: City:State: Zip: Submittal Date: Tue Feb 19 11:41:27 EST 2013
Copyright Assignment
I, Charles Rainville, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Charles Rainville, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 25-NFPA 820-2013 [ Section No. 7.1.3 ]
7.1.3NFPA 70E and NFPA 101 ® and NFPA 56 shall be referenced foradditional requirements to protect against safety and health hazards.
Statement of Problem and Substantiation for Public Input
NFPA 56 is relevant here.
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address:City: State: Zip:Submittal Date: Thu Jul 04 18:29:12 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 26-NFPA 820-2013 [ Section No. 7.2.1.2 ]
7.2.1.2Enclosed spaces classified as explosion hazard areas under thisdocument shall be physically separated from all unclassified enclosures with minimum 3 hour rated walls or doors .
Statement of Problem and Substantiation for Public Input
Physically separated needs to be defined. I would think the physical separation is to be something of substantial meaningful construction.
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City:State: Zip: Submittal Date: Thu Jul 04 18:33:22 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 53-NFPA 820-2013 [ New Section after 7.4.3 ]
7.4.3.1Detectors shall be provided with an auxilliary power supply to ensure continuous operation during any failure of any normal power supply.
Statement of Problem and Substantiation for Public Input
Provides clarification of existing 7.5.4. All fire alarm systems are required to have auxiliary power supplies. If CGD systems are used for fire protection then they should have the same functional requirements as fire alarm systems.
Submitter Information Verification
Submitter Full Name: CHARLES OLAHOrganization: EMA CANADAStreet Address: City:State: Zip: Submittal Date: Mon Jul 08 16:28:36 EDT 2013
Copyright Assignment
I, CHARLES OLAH, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am CHARLES OLAH, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 52-NFPA 820-2013 [ Section No. 7.4.3 ]
7.4.3 *Combustible gas detectors shall be listed.
Statement of Problem and Substantiation for Public Input
Annex should be used to explain that CGD should also be performance approved because the failure of CGD performance could give a false indication that the monitored area is safe.
Submitter Information Verification
Submitter Full Name: CHARLES OLAHOrganization: EMA CANADAStreet Address: City:State: Zip: Submittal Date: Mon Jul 08 16:24:06 EDT 2013
Copyright Assignment
I, CHARLES OLAH, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am CHARLES OLAH, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 27-NFPA 820-2013 [ Section No. 7.4.4 ]
7.4.4The installation, calibration, and maintenance of combustible gas detectors shall be in accordance with their listing requirements and the manufacturers' instructions.
Statement of Problem and Substantiation for Public Input
It might be implied but it seems more explicit to actually mention calibration and maintenance.
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City:State: Zip: Submittal Date: Thu Jul 04 18:37:15 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 31-NFPA 820-2013 [ Section No. 7.4.4 ]
7.4.4The installation of combustible gas detectors shall be in accordance with their listing requirements and the manufacturers' instructions.
Statement of Problem and Substantiation for Public Input
mmm
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address:City: State: Zip:Submittal Date: Thu Jul 04 18:47:33 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 55-NFPA 820-2013 [ Section No. 7.4.5.1 ]
7.4.5.1Detectors located in hazardous (classified) locations shall Detectors required as Fire Protection Measures in Chapters 4, 5 and 6 of this Standard shall be set to alarm at 10 percent of the lower explosive limit (LEL) in accordance with the manufacturers' calibration instructions and shall be connected to alarm signaling systems that shall comply with the (proposed) requirements of 7 . 7.
Statement of Problem and Substantiation for Public Input
Chapters 4, 5 and 6 of the Standard requires CGD in locations that may actually be unclassified due to high ventilation rates (Table 4.2, 11, b). If CGDs are required in Chapters 4, 5 or 6 as fire protection measures, than these CGD should be connected to alarm signaling systems. The functional requirements for the alarm signaling systems referenced here are not defined, so this rule should reference the requirements for these signaling systems.
Submitter Information Verification
Submitter Full Name: CHARLES OLAHOrganization: EMA CANADAStreet Address: City:State: Zip: Submittal Date: Mon Jul 08 16:33:47 EDT 2013
Copyright Assignment
I, CHARLES OLAH, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am CHARLES OLAH, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 59-NFPA 820-2013 [ Section No. 7.5 ]
7.5 Ventilation Monitoring and Signaling Systems .7.5.1
All continuous ventilation systems that are used to downgrade the classification of a space shall be fitted with flow detection devices connected to alarm signaling systems to indicate ventilation system failure to provide the required air changes.
7.5.2Local and remote alarms for both ventilation system failure and combustible gas detection shall be provided for all hazardous areas classified in accordance with the following:
(1) Article 500 of NFPA 70
(2) The requirements of Chapters 4 , 5 , and 6 for pressurization of spaces
(3) Chapter 7 and NFPA 496
7.5.3 *
The alarms required in 7.5.2 shall be displayed in accordance with Table7.5.3 .Table 7.5.3 Ventilation System Alarm Devices for Areas Indicated in 7.5.2Location/Supervision Alarm Devices and Supervision Entrance(s) to such spaces* Visual and audible alarms Within such spaces Visual and audible alarms Local (within treatment plant or building) Visual and audible alarms Remote (for distant supervision) Visual and audible alarms
*Where locations are not constantly attended, the use of a nonaudible signal is permitted if a dual-light system is used. A dual-light system is to include a“go”/“no go” or green light/red light type of warning system instead of theaudible alarm.7.5.3.1
In situations where remote supervision is impractical, a telephone dialer shall be allowed to meet the intent of the remote (for distant supervision) listing in Table 7.5.3 .
7.5.4Signaling systems shall be in accordance with the requirements for supervised signaling systems as set forth in NFPA 72 . The alarm signaling systems shall comply with the (proposed) requirements of 7.7.
Statement of Problem and Substantiation for Public Input
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The existing title suggests that the signaling systems described herein only apply where ventilation monitoring is involved and doesn't apply stand-alone to CGD alarms or pressurization failure alarms. To add clarification, each hazard (CGD, ventilation failure and pressurization failure) should be given it's own section with common signaling system requirements.
Submitter Information Verification
Submitter Full Name: CHARLES OLAHOrganization: EMA CANADAStreet Address: City:State: Zip: Submittal Date: Mon Jul 08 16:41:40 EDT 2013
Copyright Assignment
I, CHARLES OLAH, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am CHARLES OLAH, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 28-NFPA 820-2013 [ Section No. 7.5.1 ]
7.5.1All continuous ventilation systems that are used to downgrade the classification of a space shall be fitted with flow detection devices connected to alarm signaling systems to indicate ventilation system failure to provide the required air changes. If installed the flow from these systems shall be measured annually by an AABC or equivalent certified air balance technician to certify that required flows still exist.
Statement of Problem and Substantiation for Public Input
These are critical life safety ventilation systems since if they go down there could be a rapid build up and explosion. Even though it is this critical, there is no requirement for verifying the quantity of proper flow, just that there is some kind of flow. We all know that lots of things can and do happen to fans, (dirt, belts, damper positions, clogged air intakes, filters, duct issue, and the list goes on and on).
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City:State: Zip: Submittal Date: Thu Jul 04 18:39:19 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 32-NFPA 820-2013 [ New Section after 7.5.2 ]
7.5.3 Alarm and signaling device testingTesting of alarms and signaling devices related to atmospheric monitoring and critical flow monitoring for air changes shall be performed annually by qualified personel. Testing results shall be maintained at the site along with required critical flow measurements for a period of 3 years.
Statement of Problem and Substantiation for Public Input
It's important that if critical life safety devices exist that they be regularly tested and the results documented and maintained.
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City:State: Zip: Submittal Date: Thu Jul 04 18:48:34 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 63-NFPA 820-2013 [ New Section after 7.6 ]
7.6 Pressurization Monitoring7.6.1 All pressurization systems used to downgrade the electrical classification of a space shall be in accordance with NFPA 496. Failure of the pressurization system shall activate alarm signaling systems that comply with the (proposed) requirements of 7.7.
Statement of Problem and Substantiation for Public Input
Existing rule 7.5.2 lumps the alarming requirements of several hazards together. The individual hazards deserve their own section, which allows for more clarity to be provided for each one.
Submitter Information Verification
Submitter Full Name: CHARLES OLAHOrganization: EMA CANADAStreet Address: City:State: Zip: Submittal Date: Mon Jul 08 16:49:29 EDT 2013
Copyright Assignment
I, CHARLES OLAH, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am CHARLES OLAH, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 66-NFPA 820-2013 [ New Section after 7.7 ]
7.7 Alarm Signaling Systems7.7.1 Distinct local and remote alarms shall be displayed in accordance with Table 7.7.1.Table 7.7.1 Location and Type of Alarm Signaling Notification Appliances required in 7.7.1
Location Alarm Notification Appliances
Entrances(s) to spaces* Visual and audible alarms
Within spaces Visual and audible alarms
Supervising Station (Local or Remote) Visual and audible alarms
*Where locations are not constantly attended, the use of a non-audible signal is permitted if a dual-light system is used. A dual-light system is to include a “go”/’no go” or green light / red light type of warning system instead of the audible alarm.7.7.2* Local and remote alarms required in Table 7.7.1 shall be located so as to be readily heard and seen by responsible personnel.7.7.3 Alarm signaling system equipment shall be provided with an auxiliary power supply to ensure continuous operation during the failure of the normal power supply. The alarm shall be of sufficient duration to alert responsible personnel.7.7.4 In situations where remote supervision is impractical, a telephone dialer shall be allowed to meet the intent of the Supervising Station location listing in Table 7.7.1.7.7.5 Visual and audible alarms required in Table 7.7.1 shall be tested monthly to verify their functionality.Exception: The monthly testing requirement shall be permitted to be reduced to semiannually where the conductors of the visual and audible notification appliances are monitored for integrity as set forth in NFPA 72.
Statement of Problem and Substantiation for Public Input
Provides clarification that signaling systems are required for all of CGD, ventilation failure and pressurization failure, independently. Also provides clarification on intent of existing 7.5.4. Alarm signals are to be received at locations that are constantly attended, where people are able to investigate and respond to the alarms. Local alarms are also required to warn people in the area that a potential hazard exists. Fire Alarm signaling systems require an auxiliary power supply with the capacity to activate visual and audible alarms for a set duration after the failure of the primary power supply. As CGD / ventilation failure / pressurization failure also presents a fire risk, the same auxiliary power requirements should also apply to these visual and audible alarms.
Submitter Information Verification
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Submitter Full Name: CHARLES OLAHOrganization: EMA CANADAStreet Address: City:State: Zip: Submittal Date: Mon Jul 08 16:59:29 EDT 2013
Copyright Assignment
I, CHARLES OLAH, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am CHARLES OLAH, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 42-NFPA 820-2013 [ Section No. 8.2.2 ]
8.2.2 *Selection criteria shall include the following:
(1) Structural requirements
(2) Location and operating environment
(3) Fire resistance rating(4) Flame spread index value
(5) Smoke density generation factors developed index or other smoke generation values
(6) Products of combustion
(7) Corrosion resistance
A.8.2.2 The smoke developed index is assessed by means of testing via ASTM E84 or UL 723.
Statement of Problem and Substantiation for Public Input
Use of the correct terminology
Related Public Inputs for This Document
Related Input RelationshipPublic Input No. 40-NFPA 820-2013 [Section No. 3.3.50]Public Input No. 41-NFPA 820-2013 [Section No. A.3.3.50.2]
Submitter Information Verification
Submitter Full Name: Marcelo HirschlerOrganization: GBH InternationalStreet Address: City:State: Zip: Submittal Date: Sat Jul 06 19:51:42 EDT 2013
Copyright Assignment
I, Marcelo Hirschler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
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By checking this box I affirm that I am Marcelo Hirschler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 43-NFPA 820-2013 [ Section No. 8.2.3 ]
8.2.3For the purpose of this document, materials of construction shall be divided into the following four basic categories:
(1) Combustible
(2) Noncombustible
(3) Limited-combustible(4) Low flame spread index (LFS)
Statement of Problem and Substantiation for Public Input
ASTM E84 measures flame spread index and not flame spread
Related Public Inputs for This Document
Related Input RelationshipPublic Input No. 42-NFPA 820-2013 [Section No. 8.2.2]Public Input No. 40-NFPA 820-2013 [Section No. 3.3.50]Public Input No. 41-NFPA 820-2013 [Section No. A.3.3.50.2]
Submitter Information Verification
Submitter Full Name: Marcelo HirschlerOrganization: GBH InternationalStreet Address: City:State: Zip: Submittal Date: Sat Jul 06 19:55:02 EDT 2013
Copyright Assignment
I, Marcelo Hirschler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Marcelo Hirschler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 44-NFPA 820-2013 [ Section No. 8.3.3.2.4 ]
8.3.3.2.4Nonstructural assemblies such as ventilation ducts and piping shall be constructed of noncombustible, limited-combustible, or low flame spread index materials.
Statement of Problem and Substantiation for Public Input
consistent terminology
Submitter Information Verification
Submitter Full Name: Marcelo HirschlerOrganization: GBH InternationalStreet Address: City:State: Zip: Submittal Date: Sat Jul 06 19:57:16 EDT 2013
Copyright Assignment
I, Marcelo Hirschler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Marcelo Hirschler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 8-NFPA 820-2013 [ Section No. 8.3.3.6.2 ]
8.3.3.6.2 Systems supplying or exhausting air at a rate greater than 56.6 m3/min (2000 ft3/min) shall include listed smoke dampers, listed fire dampers, and listed smoke detection and shall cause the ventilation system to shut down upon detection of smoke detectors shall be used for ventilation systems in accordance with NFPA 90A and NFPA 91 .
Additional Proposed Changes
File Name Description Approved820_Rainville_4_820-2008.pdf Cover Sheet
Statement of Problem and Substantiation for Public Input
As this paragraph is located in Chapter 8, Materials of Construction, it appears that the intent was to require the installation of listed products. As presently worded, installation of all the product types described is required in all supply and all exhaust air systems for greater than 2000 cfm capacity which is inconsistent with the requirements of NFPA 90A and NFPA 91. Requirements for the installation of these product types is currently fully defined in NFPA 90A and NFPA 91 and the requirements for ventilation system shut down upon detection of smoke is currently fully defined in NFPA 90A. The proposed change will avoid confusion and the installation of these product types where they are unwarranted.
Submitter Information Verification
Submitter Full Name: Charles RainvilleOrganization: Hallam-ICSStreet Address: City:State: Zip: Submittal Date: Tue Feb 19 11:51:17 EST 2013
Copyright Assignment
I, Charles Rainville, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Charles Rainville, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 6-NFPA 820-2013 [ Section No. 9.2.5 ]
9.2.5 Ventilation systems serving unclassified areas adjacent to and not physically separated from classified areas shall maintain a differential pressure relative to ambient air pressure of 25 Pa (0.1 in. water column) under all operatingconditions.
Additional Proposed Changes
File Name Description Approved820_Rainville_4_820-2008.pdf Cover Sheet
Statement of Problem and Substantiation for Public Input
Proposed change would align these requirements more closely with those of NFPA 30, 2008 edition, 7.3.4 which describes that "A classified area shall not extend beyond a floor, wall, roof or other solid partition that has no openings within the classified area." NFPA 30 relies on room construction with no openings for containment of hazards in classified areas without mention of pressurization requirements. In wastewater treatment facilities, reliance on "physically separated" construction as defined in NFPA 820 in lieu of continuous ventilation system operation with positive or negative pressurization would result in significant energy savings in colder climate facilities. Also the current requirement for pressurization precludes the implementation of a system operated with "No ventilation" per Note A of Tables 4.2, 5.2, and 6.2(a) for spaces with the adjacencies described.
Submitter Information Verification
Submitter Full Name: Charles RainvilleOrganization: Hallam-ICSStreet Address: City:State: Zip: Submittal Date: Tue Feb 19 11:44:11 EST 2013
Copyright Assignment
I, Charles Rainville, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Charles Rainville, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 7-NFPA 820-2013 [ Section No. 9.2.6 ]
9.2.6 Ventilation systems serving classified areas adjacent to and not physicallyseparated from unclassified areas shall maintain a differential pressure relative to ambient air pressure of -25 Pa (-0.1 in. water column) under all operating conditions.
Additional Proposed Changes
File Name Description Approved820_Rainville_4_820-2008.pdf Cover Sheet
Statement of Problem and Substantiation for Public Input
Proposed change would align these requirements more closely with those of NFPA 30, 2008 edition, 7.3.4 which describes that "A classified area shall not extend beyond a floor, wall, roof or other solid partition that has no openings within the classified area." NFPA 30 relies on room construction with no openings for containment of hazards in classified areas without mention of pressurization requirements. In wastewater treatment facilities, reliance on "physically separated" construction as defined in NFPA 820 in lieu of continuous ventilation system operation with positive or negative pressurization would result in significant energy savings in colder climate facilities. Also the current requirement for pressurization precludes the implementation of a system operated with "No ventilation" per Note A of Tables 4.2, 5.2, and 6.2(a) for spaces with the adjacencies described.
Submitter Information Verification
Submitter Full Name: Charles RainvilleOrganization: Hallam-ICSStreet Address: City:State: Zip: Submittal Date: Tue Feb 19 11:48:58 EST 2013
Copyright Assignment
I, Charles Rainville, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Charles Rainville, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 50-NFPA 820-2013 [ New Section after 10.11 ]
Responding to alarmsIt is required that fixed monitors provide both visual and audio alarms. It is required that the managment team prepare responses for alarms that address what responses or actions are to be taken when these alarms go off. All personnel who would be present at the site, including temporary staff or visitors, are to be trained in responses to these alarms.
Statement of Problem and Substantiation for Public Input
It's important that everyone know what is supposed to happen if an alarm goes off. Are personal supposed to go investigate? If so Who? With what protection? Should they take portable meters in? What meters? are they trained? Could you be sending someone into a terrible and dangerous situation? Should everyone evacuate? Do vistors know that for example 3 beeps on a horn means evacuate?
This section needs additional annex material to explain what is really being asked for here.
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City: State:Zip: Submittal Date: Mon Jul 08 11:41:13 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 49-NFPA 820-2013 [ New Section after 10.11.3 ]
Hot Work Permit RequirementsAll atmospheres in and around vessels shall be continuously monitored throughout the perod when work is being performed.
Statement of Problem and Substantiation for Public Input
There have been a number of explosions associated with wastewater treatment plants. The US Chemical Safety Board, www.csb.gov, has a video that describes many of thes incidents. In several of them, especially the wastewater related ones, they say that one of the root causes of the explosions was that ambient environments were not continuously monitored and conditions changed where gas was generated and released because of things warming up.
I encourage all of you to take 15 minutes and watch this video if you have not already seen it.
Submitter Information Verification
Submitter Full Name: John PuskarOrganization: Puskarco Inc.Street Address: City:State: Zip: Submittal Date: Mon Jul 08 11:36:21 EDT 2013
Copyright Assignment
I, John Puskar, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I herebywarrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am John Puskar, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 10-NFPA 820-2013 [ Chapter A ]
Annex A Explanatory MaterialAnnex A is not a part of the requirements of this NFPA document but is included for informational purposes only. This annex contains explanatory material, numbered to correspond with the applicable text paragraphs.A.1.1.1Other NFPA standards should be consulted for additional requirements relating to wastewater treatment and collection facilities.
A.1.3.1In existing facilities, it is not always practical to apply the
provisions of this standard strictly. Physical limitations could necessitate disproportionate effort or expense with little increase in fire protection. In such cases, the authority having jurisdiction should be satisfied that reasonable fire protection is ensured. In existing facilities, it is the intent that any condition that represents a serious threat to fire protection should be mitigated by application of appropriate safeguards. It is not the intent to require modification for conditions that do not represent a significant threat to fire protection, eventhough such conditions are not literally in conformance with the fire protection requirements.
A.1.8For additional information, see NFPA 497 and NFPA
499. Although some of the recommendations of these documents are not applicable to wastewater treatmentfacilities, both documents do provide useful information.
A.3.2.1 Approved.The National Fire Protection Association does
not approve, inspect, or certify any installations, procedures, equipment, or materials; nor does it approve or evaluate testing laboratories. In determining the acceptability of installations, procedures, equipment, or materials, the authority having jurisdiction may base acceptance on compliance with NFPA or other appropriate standards. In the absence of such standards, said authority may require evidenceof proper installation, procedure, or use. The authority having jurisdiction may also refer to the listings or labeling practices of an organization that is concerned with product evaluations and is thus in a position to determine compliance with appropriate standards for the current production of listeditems.
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A.3.2.2 Authority Having Jurisdiction (AHJ).
The phrase “authority having jurisdiction,” or its acronym AHJ, is used in NFPA documents in a broad manner, since jurisdictions and approval agencies vary, as do their responsibilities. Where public safety is primary, the authority having jurisdiction may be a federal, state, local, or other regional department or individual such as a fire chief; fire marshal; chief of a fire prevention bureau, labor department, or health department; building official; electrical inspector; or others having statutory authority. For insurance purposes, an insurance inspection department, rating bureau, or other insurance company representative may be the authority having jurisdiction. In many circumstances, the property owner or his or her designated agent assumes the role of the authority having jurisdiction; at government installations, the commanding officer or departmental official may be the authority havingjurisdiction.
A.3.2.4 Listed.The means for identifying listed
equipment may vary for each organization concerned with product evaluation; some organizations do not recognize equipment as listed unless it is also labeled. The authority having jurisdiction should utilize thesystem employed by the listing organization to identify a listedproduct.
A.3.3.3 Anaerobic Digestion.
Process by-products include a gas containing methane, carbon dioxide, and small quantities of hydrogen sulfide. The digestion tank can have a fixed or floating roof system. A.3.3. 9 Combustible GasDetector
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Combustible gas detection may be portable or fixed systems. In collections wet wells and other infrequently accessed locations, portable gas detection may be used. In screen facilities, tunnels with gas piping, and other routinely accessed areas a fixed detection system should be installed.
A.3.3. 15.1 Gas-Handling Equipment.
Gas-handlingequipment does not include equipment or devices for the utilization of the gas, such as boilers, engines, and waste gas burners.
A.3.3.20 FireBarrier.
Suchbarriers might have protected openings. For the purpose of this document, a firebarrier does not meet the requirementsof physical separation as definedelsewhere in this document.
A.3.3.29 FluidizedBed Reactor.
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Applicationsincludeion exchange, granular activated carbonadsorbers, and sometypesoffurnaces, kilns,and biological contactors.
A.3.3.31 Galleries.
Galleriesfrequently contain gas or other hazardous material transport systems, water,wastewater, sludge piping, electrical wiring, and mechanical or electricalequipment.
A.3.3.32.2 FuGas.
SeeNFPA 54.
A.3.3.32Gas.
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Thgas mighconttracequanof methand hydrsulficoulbe lowin oxygand coulbe botha fire and life safehaza
AGas
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Statement of Problem and Substantiation for Public Input
A.3.3.9 Combustible Gas DetectorMy recommendation is to clarify that portable or fixed systems may be used for gas detection. The requirements of the tables in NFPA 820 are for “design and construction” and listing combustible gas detection as a requirement may imply that a fixed gas detection system must be included in the design and construction. For wet wells and other locations that are rarely entered, are unlikely to have any electrical equipment, and are in normally unoccupied locations, a fixed gas detection system provides no operational or safety benefit. In primary screening areas, tunnels with gas piping, and similar locations that are routinely entered a fixed gas detection is beneficial.As an alternative this information could be included in Section 7.4 Combustible Gas Detection.
Submitter Information Verification
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Submitter Full Name: TOM BURGESSOrganization: ARCADISStreet Address: City:State: Zip: Submittal Date: Sun Mar 10 11:43:30 EDT 2013
Copyright Assignment
I, TOM BURGESS, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am TOM BURGESS, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 41-NFPA 820-2013 [ Section No. A.3.3.50.2 ]
A.3.3.50.2 Low Flame Spread Rating.See ASTM E 84 or UL 723.
Statement of Problem and Substantiation for Public Input
ASTM E84 and UL 723 have nothing on low flame ratings.
Related Public Inputs for This Document
Related Input RelationshipPublic Input No. 40-NFPA 820-2013 [Section No. 3.3.50]
Submitter Information Verification
Submitter Full Name: Marcelo HirschlerOrganization: GBH InternationalStreet Address: City:State: Zip: Submittal Date: Sat Jul 06 19:44:38 EDT 2013
Copyright Assignment
I, Marcelo Hirschler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Marcelo Hirschler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 67-NFPA 820-2013 [ New Section after A.7.4.2 ]
A.7.4.3Combustible gas detection instruments are approved in accordance with ISA-S12.13 / CSA C22.2 No. 152, which covers the perfromance of these instruments in addition to their safety in hazardous locations.
Statement of Problem and Substantiation for Public Input
Failure (in performance) of the gas detection instruments may give a false indication that an area is safe. ISA-S12.13 requires additional testing for environmental conditions (temperature, humidity, air velocity, vibration) as well as the step response of the instrument to a known concentration of combustible gas. If these devices are to be used for Fire Protection they must be certified to the highest performance standards.
Submitter Information Verification
Submitter Full Name: CHARLES OLAHOrganization: EMA CANADAStreet Address: City:State: Zip: Submittal Date: Mon Jul 08 17:12:58 EDT 2013
Copyright Assignment
I, CHARLES OLAH, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am CHARLES OLAH, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 69-NFPA 820-2013 [ New Section after A.7.5.3 ]
A.7.7.2Spacing and location of alarms depends on many factors and will vary from site to site. In the absence of any specific requirements, NFPA 72 may be used as a guide.
Statement of Problem and Substantiation for Public Input
Existing Table 7.5.3 requires both visual and audible alarms in many locations (Entrances, Within spaces, Local/Remote). This Table does not provide any specifics on locating these visual and audible alarms. Chapter 18 of NFPA 72 provides detailed requirements for locating and the performance requirements of both visual and audible alarms used for Fire Alarms.
Submitter Information Verification
Submitter Full Name: CHARLES OLAHOrganization: EMA CANADAStreet Address: City:State: Zip: Submittal Date: Mon Jul 08 17:24:42 EDT 2013
Copyright Assignment
I, CHARLES OLAH, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am CHARLES OLAH, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 68-NFPA 820-2013 [ Section No. A.7.5.3 ]
A.7. 5 7 . 3 1In all cases, standard “Danger” signs identifying the purpose of the lights and audible alarms and warning against entry when there is an alarm condition should be posted as near as practicable to the warning devices.
Statement of Problem and Substantiation for Public Input
Due to proposed changes this update would be required.
Submitter Information Verification
Submitter Full Name: CHARLES OLAHOrganization: EMA CANADAStreet Address: City:State: Zip: Submittal Date: Mon Jul 08 17:22:50 EDT 2013
Copyright Assignment
I, CHARLES OLAH, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement ofProblem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. I hereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am CHARLES OLAH, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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Public Input No. 39-NFPA 820-2013 [ Section No. F.1.2.2 ]
F.1.2.2 ASTM Publications.ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.
ASTM E 84, Standard Test Method for Surface Burning Characteristics of Building Materials, 2009 2013a .
ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, 2004 2012 .
ASTM E 814, Standard Test Method for Fire Tests of Through-Penetration Fire Stops, 1997 (Rev. B-94). 2011a.
Statement of Problem and Substantiation for Public Input
date updates
Submitter Information Verification
Submitter Full Name: Marcelo HirschlerOrganization: GBH InternationalStreet Address:City: State: Zip:Submittal Date: Sat Jul 06 19:28:07 EDT 2013
Copyright Assignment
I, Marcelo Hirschler, hereby irrevocably grant and assign to the National Fire Protection Association (NFPA) all and full rights in copyright in this Public Input (including both the Proposed Change and the Statement of Problem and Substantiation). I understand and intend that I acquire no rights, including rights as a joint author, in any publication of the NFPA in which this Public Input in this or another similar or derivative form is used. Ihereby warrant that I am the author of this Public Input and that I have full power and authority to enter into this copyright assignment.
By checking this box I affirm that I am Marcelo Hirschler, and I agree to be legally bound by the above Copyright Assignment and the terms and conditions contained therein. I understand and intend that, by checking this box, I am creating an electronic signature that will, upon my submission of this form, have the same legal force and effect as a handwritten signature
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NFPA 820 – 72 Compatibility Document
C. Groppetti September 3, 2013
Task Group Description Task Group chair
Committee Task Group Members
Non Committee Volunteers
NFPA 72 Signaling/Alarms
Coordination of fire alarm requirements with NFPA 72 to ensure NFPA 820 is not in conflict and that its definitions of FAS and FDS are consistent with NFPA 72. Review Tables 4.2, 5.2, 6.2(a), and 6.2(b) for FAS and FDS and see if the material is in accordance with the most recent edition of NFPA 72.
Claudio Claudio Groppetti, Clark Henry , John Brosnan
Dan Olah [email protected]
General Comments:
1. Dan Olah has submitted proposed changes to Signaling/Alarms requirements using public comment. No additional changes have been made/proposed by Dan as of August 19, 2013.
2. C. Groppetti missed public comment deadline and is submitting two proposed changes: item 1, to achieve objective initial objectives of this subtask group and item 2, add an appendix to NFPA 820 defining/describing available detector types using definitions from NFPA 72. The details of both are included below.
Item 1:
Reason for change: The following proposed changes are intended to bring terminology used in NFPA 820 in line with NFPA 72-2013
1. Add definition for Fire Alarm System (FAS) to chapter 3: Definitions a. Fire Alarm System: A system or portion of a combination system that consists of
components and circuits arranged to monitor and annunciate the status of fire alarm or supervisory signal-initiating devices and to initiate the appropriate response to those signals. (From NFPA 72-2013 paragraph 3.3.105)
b. Technical Justification: Fire Alarm Systems and Fire Detection Systems are used in NPFA 820 but without any definition.
2. Change section heading of paragraph 7.3 from Fire Detection and Alarm Systems to Fire Alarm Systems
NFPA 820 – 72 Compatibility Document
C. Groppetti September 3, 2013
a. Technical Justification: Fire Detection Systems and Fire Alarm Systems are used interchangeably throughout the document. NFPA 72 does not define a Fire Detection System, while they do define a Fire Alarm System.
3. Replace all references to Fire Detection and Alarm Systems to Fire Alarm Systems. Change the following to read
a. Section 7.3: Fire Alarm System i. Section 7.3.1: Fire alarm systems for each treatment and …
ii. Section 7.3.2 Fire alarm systems shall be installed and maintained… 4. Add “FAS: Fire Alarm System” to the notes of Table 4.2 5. Remove “FDS: Fire Detection System” from the notes of Table 4.2 6. Change the following rows in Table 4.2 in column “Fire Protection Measures” to remove
reference to FDS and replace it with FAS: a. Row 20
7. Add “FAS: Fire Alarm System” to the notes of Table 5.2 8. Change the following rows in Table 5.2 in column “Fire Protection Measures” to remove
reference to FDS and replace it with FAS: a. Row 26
9. Remove “FDS: Fire Detection System” from the notes of Table 4.2 10. Change the following rows in Table 6.2(a) in column “Fire Protection Measures” to remove
reference to FDS and replace it with FAS: a. Row 22 b. Row 23 c. Row 24 d. Row 25 e. Row 26
11. Remove “FDS: Fire Detection System from notes of Table 6.2(a) 12. Technical Justification for Items 3 to 10 inclusive: Standardize on “FAS: Fire Alarm System” to
bring 820 into alignment with NFPA 72.
Item 2:
Create an Appendix to provide information regarding different fire detection equipment. a. Reason for change: Enhance understanding of available detector types that can be
used. b. Technical Justification: All definition taken from NFPA 72-2013.
Appendix XX (Actual appendix number TBD) The flowing appendix is an excerpt from section 3.3.66 of NFPA 72-2013, National Fire Alarm and Signaling Code Handbook, . The intent of this appendix is to provide a list of available detector types that can be used for the protection of wastewater facilities.
NFPA 820 – 72 Compatibility Document
C. Groppetti September 3, 2013
3.3.66 Detector. A device suitable for connection to a circuit that has a sensor that responds to a physical stimulus such as gas, heat, or smoke. 3.3.66.1 Air Sampling–Type Detector. A detector that consists of a piping or tubing distribution network that runs from the detector to the area(s) to be protected. An aspiration fan in the detector housing draws air from the protected area back to the detector through air-sampling ports, piping, or tubing. At the detector, the air is analyzed for fire products. 3.3.66.2 Automatic Fire Detector. A device designed to detect the presence of a fire signature and to initiate action. For the purpose of this Code, automatic fire detectors are classified as follows: Automatic Fire Extinguishing or Suppression System Operation Detector, Fire–Gas Detector, Heat Detector, Other Fire Detectors, Radiant Energy–Sensing Fire Detector, and Smoke Detector. 3.3.66.3 Automatic Fire Extinguishing or Suppression System Operation Detector. A device that automatically detects the operation of a fire extinguishing or suppression system by means appropriate to the system employed. 3.3.66.4 Combination Detector. A device that either responds to more than one of the fire phenomena or employs more than one operating principle to sense one of these phenomena. Typical examples are a combination of a heat detector with a smoke detector or a combination rate-of-rise and fixed-temperature heat detector. This device has listings for each sensing method employed. 3.3.66.5 Electrical Conductivity Heat Detector. A line-type or spot-type sensing element in which resistance varies as a function of temperature. 3.3.66.6 Fire–Gas Detector. A device that detects gases produced by a fire. 3.3.66.7 Fixed-Temperature Detector. A device that responds when its operating element becomes heated to a predetermined level. 3.3.66.8 Flame Detector. A radiant energy–sensing fire detector that detects the radiant energy emitted by a flame. 3.3.66.9 Gas Detector. A device that detects the presence of a specified gas concentration. Gas detectors can be either spot-type or line-type detectors. 3.3.66.10 Heat Detector. A fire detector that detects either abnormally high temperature or rate-of-temperature rise, or both. 3.3.66.11 Line-Type Detector. A device in which detection is continuous along a path. Typical examples are rate-of-rise pneumatic tubing detectors, projected beam smoke detectors, and heat-sensitive cable. 3.3.66.12 Multi-Criteria Detector. A device that contains multiple sensors that separately respond to physical stimulus such as heat, smoke, or fire gases, or employs more than one sensor to sense the same
NFPA 820 – 72 Compatibility Document
C. Groppetti September 3, 2013
stimulus. This sensor is capable of generating only one alarm signal from the sensors employed in the design either independently or in combination. The sensor output signal is mathematically evaluated to determine when an alarm signal is warranted. The evaluation can be performed either at the detector or at the control unit. This detector has a single listing that establishes the primary function of the detector. 3.3.66.13 Multi-Sensor Detector. A device that contains multiple sensors that separately respond to physical stimulus such as heat, smoke, or fire gases, or employs more than one sensor to sense the same stimulus. A device capable of generating multiple alarm signals from any one of the sensors employed in the design, independently or in combination. The sensor output signals are mathematically evaluated to determine when an alarm signal is warranted. The evaluation can be performed either at the detector or at the control unit. This device has listings for each sensing method employed. 3.3.66.14 Other Fire Detectors. Devices that detect a phenomenon other than heat, smoke, flame, or gases produced by a fire. 3.3.66.15 Pneumatic Rate-of-Rise Tubing Heat Detector. A line-type detector comprising small-diameter tubing, usually copper, that is installed on the ceiling or high on the walls throughout the protected area. The tubing is terminated in a detector unit containing diaphragms and associated contacts set to actuate at a predetermined pressure. The system is sealed except for calibrated vents that compensate for normal changes in temperature. 3.3.66.16 Projected Beam–Type Detector. A type of photoelectric light obscuration smoke detector wherein the beam spans the protected area. 3.3.66.17 Radiant Energy–Sensing Fire Detector. A device that detects radiant energy, such as ultraviolet, visible, or infrared, that is emitted as a product of combustion reaction and obeys the laws of optics. 3.3.66.18 Rate Compensation Detector. A device that responds when the temperature of the air surrounding the device reaches a predetermined level, regardless of the rate-of-temperature rise. 3.3.66.19 Rate-of-Rise Detector. A device that responds when the temperature rises at a rate exceeding a predetermined value. 3.3.66.20 Smoke Detector. A device that detects visible or invisible particles of combustion. 3.3.66.21 Spark/Ember Detector. A radiant energy–sensing fire detector that is designed to detect sparks or embers, or both. These devices are normally intended to operate in dark environments and in the infrared part of the spectrum. 3.3.66.22 Spot-Type Detector. A device in which the detecting element is concentrated at a particular location. Typical examples are bimetallic detectors, fusible alloy detectors, certain pneumatic rate-of-rise detectors, certain smoke detectors, and thermoelectric detectors.
Background on the Industrial and Other Exclusion in Section 1.1.3 The NFPA-820 Committee was initially formed to address reports of potential fire and explosions hazards in wastewater treatment plants and collection systems. The Committee had reports of several incidents, including a major explosion in a collection sewer in Louisville, KY. The initial committee membership had a heavy municipal wastewater background. The Committee decided to conduct a survey of municipal facilities to see if there was sufficient evidence of a problem to warrant developing a Recommended Practice. The NFPA conducted a search and members of the Committee conducted a survey and actually did site visits to several municipal treatment facilities. I visited six plants in the DC area, Maryland, and Virginia. I and the other committee members found many problems and violations of the Fuel Gas Code, National Electric Code, and other codes and standards. Based on the results of the investigation, the Committee agreed that there was a potential problem and existing guidance such as NFPA-328 (Manholes, Sewers, and Similar Underground Structures) was not adequate and new guidance should be developed. The Committee also heard feedback from several Committee members that the Ten States Standards (used by many states as the principal design guidance) did not provide adequate ventilation rates to protect pumping stations and other underground structures for explosions and fire. However, after much discussion, the Committee agreed that several areas should be excluded from the document, including collection, treatment, or disposal of industrial waste or manufactured by-products that are treated on site, on-site treatment systems (as defended in 3.3.61), industrial sewers systems and appurtenances (as defined in 3.3.54.5), etc (refer to section 1.1.3 for all exclusions). This decision may have been based on several factors:
1. Industrial treatment facilities were better covered under existing guidance and standards than municipal facilities.
2. Industries understand their specific materials and by-products and how to handle them safely.
3. Industrial treatment facility operators are better trained than municipal plant operators.
4. Industrial sewer are generally designed and constructed differently than municipal sewers. Information from the American Concrete Association (a former member of the Committee) indicated that many industrial sewer and manholes were actually designed to withstand an explosion.
5. Industrial facilities are more frequently and rigorously inspected. 6. Industrial sewers that convey wastewater to a municipal collection system or to a
municipal wastewater treatment plant are regulated under the Federal Pretreatment Regulations, and to a greater extend by local sewer use ordinances. The Federal Pretreatment Regulation at 40 CFR, Part 403. This prohibits the discharge to publicly owned sewer or treatment facility of any substance or material that is reactive, corrosive, explosive, radioactive, or in any way interferes with the normal operation of the treatment facility or the disposal of the residuals. Local sewer use ordnances may go further in restriction what industries can discharge to the municipal system.
7. Small on-site residential systems serving one or small group of homes presented a minimal threat of explosion. In addition, many of the pump manufacturers could provide explosion proof submersible pumps if specified by the design engineer or required by the municipality or developers.
8. In order to get a document out quickly, the Committee needed to limit the initial scope.
9. There may also have been a feeling that the Committee membership had limited expertise to deal with industrial waste treatment.
Specific questions raised by the Committee during the call on March 16, 2012: Q: Is there any additional background information on the exclusions? A: See discussion above. Q: Are modifications or clarifications to the exclusions is necessary? A: Needs further discussion by the Committee. Q: Does size of the facility (MGD), wastewater composition, or point of discharge have a
bearing on the exclusion? A: Size probable has little impact, composition could have some impact, and point of
discharge could have significant impact. Here we need to separate on-site industrial sewers and treatment from industrial sewers transporting wastewater for off-site treatment.
Industrial sewers that are owned and operated by the industry and carry industrial waste
to an on-site treatment facility that is owned and operated by the industry or contracted by the industry are excluded from NFPA-820 for the reasons stated above in the background discussion (paragraphs 1-5). Industrial sewers that discharge to a municipal collections system or treatment plant are also excluded, because flows and composition are regulated under the Federal pretreatment program or local sewer use ordinances as discussed above (paragraph 6).
Q: Does "industrial sewer" really mean pre-treatment sewer? A: The definition of industrial sewer is consistent with definitions used by the Water
Environment Federation, American Society of Civil Engineers, and other design standards. While industrial sewers that discharge to a municipal collection system are regulated under the Federal Pretreatment Program and local sewer use ordinances, the purpose of the sewer is still to convey principally industrial wastewater (3.3.54.5).
Q: Is there a logical explanation for the exclusion paragraph? A: As discussed above, there may have been several reasons for including the exclusions.
For industrial wastes was excluded primarily because of the time constraints and magnitude of developing a document that would cover every type of industry and because the Committee felt the industrial waste was adequate covered by other Codes, Standards, and Regulations,
Q: Should a residential component be added to the definition of Residential Sewer in 3.3.54.11?
A: The definitions of residential and sanitary sewers are consistent with definitions used by the Water Environment Federation, American Society of Civil Engineers, and other design standards (3.3.54.11 and 3.3.54.12).
Q: What is the basis for the "not more than five" in Table 4.2, Rows 8 & 9? A: Guidance developed by EPA for on-site collection and treatment systems defines small
sewers serving 5 or less homes as individual residential sewers. For sewers serving more than 5 homes, the EPA defines them as residential sewers or sanitary sewers.
Based on information developed by several of the Committee members (representing the wastewater pump manufacturers) it was demonstrated that the buildup of gases from the decomposition of organic waste produced from 5 or less home would not generate an explosive condition in the pumping station and therefore, individual residential sewers and pumping stations (Table 4.2, Rows 8 & 9) were unclassified. While residential sewers and pumping stations serving more than 5 homes were classified (Table 4.2 Rows 10 & 11).
Q: is additional information needed in Annex A that provides clarification of 1.1.3 and Table 4.2, Rows 8 & 9?
A: If the Committee deemed it necessary, additional clarification could be added to the Annex.
Conclusions The question would be: what has changed since developing the document to warrant expanding the scope to include industrial waste collection sewers and treatment facilities. How would be deal with the vast number of different industries, materials, chemicals, and byproducts? I do not know of any compelling need to expand the current scope. However, others on the Committee may feel differently. Another area that has been discussed for time to time by the Committee is the need to include some information on anti-terrorism. There are number of preventive strategies, some response measurers, and some tools. This could be discussed in a short appendix.
1.1.3 (5) No change 3.3.54.5 Industrial sewer systems: Sewer intended to carry only industrial wastewater (e.g., municipal sewers caring industrial wastewater pretreated under federal. State, or local pretreatment requirements and discharge to a publicly owned collection system or treatment plant; or private sewer caring industry specific industrial wastewater and discharging to a privately owned and operated wastewater treatment facility designs to handle the industry specific wastewater.. 3.3.54.11 Residential Sewer: A sewer intended to receive only residential domestic wastewater from one or more individual homes and with a total daily flow of not more than 500 gallons per day (gpd). Table 4.2 Row 8: Individual Residential Sewer: Sewer serving one or more individual home with a combined flow of not more than 500 (gpd). Table 4.2 Row 9: Individual Residential Pumping Units: Pumping units serving one or more individual home with a combined flow of not more than 500 gpd (e.g., grinder pumps, septic tank effluent pumps, ejector pumps, etc.)
Location and Function Row Line
Fire and Explosion Hazard Ventilation1
Extent of Classified Area
NEC -Area Electrical Classification (All Class I, Group D)2
a NR If exposed to combustible particulate solides, entire room4
Division 1
b NR Areas within equipment processing combustible particulate solids
Division 1
c NR Areas within 3 m (10 ft) of equipment processing combustible particulate solids
Division 2
d NR Areas beyond 3 m (10 ft) of equipment processing combustible particulate solids
Unclassified
a NR If exposed to dried sludge, entire room4
Division 1
b NR Areas within tanks storing dried sludge
Division 1
1
2
SLUDGE-DRYING PROCESSES3
DRIED SLUDGE STORAGE AREAS, IF ENCLOSED
Potential for ignition of dust
Potential for ignition of dust
c NR Areas within 3 m (10 ft) of tanks storing dried sludge
Division 2
d NR Areas beyond 3 m (10 ft) of tanks storing dried sludge
Unclassified
4The area beyond the envelope is unclassified.
NC: Noncombustible material. NEC : In accordance with NFPA 70 .
FAS: Fire alarm system. FSS: Fire suppression system (e.g., Automatic sprinkler, water spray, foam, gaseous, or H: Hydrant protection in accordance with 7.2.4.
NR: No requirement.Footnotes:1For sludge-drying processes that use flammable or combustible liquids, ventilate in accordance with NFPA 30.2Or if acceptable to the authority having jurisdiction with classification in NFPA 499.3See NFPA 54, NFPA 85, NFPA 499, and NFPA 654. For sludge-drying processes that use
(2) The following codes are used in this table:
Notes:(1) The NR designation in the ventilation column indicates that no ventiliation requirements are established for the space, and, therefore, Table 9.1.1.4 also has no
Material of Construction for
Buildings or Structres
Fire Protection Measures
NC (construction in accordance with NFPA 30, NFPA 68, NFPA 69, and NFPA 654)
H, FAS, and FSS (See NFPA 30, NFPA 61, NFPA 69, NFPA 85, NFPA 499, and NFPA 654)
NC (construction in accordance with NFPA 68, NFPA 69, NFPA 499, and NFPA 654)
H and FSS (See NFPA 61, NFPA 69, NFPA 497, and NFPA 654)
NC (construction in accordance with NFPA 68, NFPA 69, NFPA 499, and NFPA 654)
H and FSS (See NFPA 61, NFPA 69, NFPA 497, and NFPA 654)
Location and Function Fire and Explosion Hazard Row Line VentilationMATERIALS USED IN REHABILITATION, RECONSTRUCTION, OR SLIP-LINING OF SEWERS
NA 1 NA
INDUSTRIAL SEWER Sewer transporting industrial wastewater only (no sanitary wastewater)
Not included within the scope of this standard
2
STORM SEWER Sewer transporting storm water only (no sanitary wastewater)
Possible ignition of flammable gases and floating flammable liquids
3 NNV
STORM WATER PUMPING STATION WET WELLS Liquid side of pumping station serving only a storm sewer system
Possible ignition of flammable gases and floating flammable liquids
4 NNV
a D
b C
PRESSURE SEWER (Force main) Sewer under pressure (flooded discharge pipe from pump or tank)
Not included within the scope of this standard
6
BUILDING SEWER (Lateral sewer or drain) Sewer serving a house or single building (plumbing)
Not included within the scope of this standard
7
STORM WATER PUMPING STATION DRY WELLS Dry side of a pumping station serving only a storm sewer system and physically separated from wet well
Buildup of vapors from flammable or combustible liquids
5
INDIVIDUAL RESIDENTIAL SEWER Sewer serving one but not more than five dwellings
NA 8 NNV
INDIVIDUAL RESIDENTIAL PUMPING UNITS Pumping units serving one but not more than five dwellings (e.g. grinder pumps, septic tank effluent pumps, ejector pumps)
NA 9 NNV
a NNV
b B
a A
b B
a D
b C
OUTFALL SEWER Final discharge pipe from a treatment plant, transporting treated wastewater
NA 13 NNV
RESIDENTIAL SEWER Sewer transporting primarily residential wastewater
Possible ignition of flammable gases and floating flammable liquids
10
RESIDENTIAL WASTEWATER PUMPING STATION WET WELL Pumping station transporting primarily residential wastewater
RESIDENTIAL WASTEWATER PUMPING STATION DRY WELL Dry side of a pumping station transporting primarily residential wastewater
11
12
Possible ignition of flammable gases and floating flammable liquids
Buildup of vapors from flammable or combustible liquids
a NNV
b B
a NNV
b B
a A
b B
a C
b D
15
16
17BELOWGRADE OR PARTIALLY BELOWGRADE WASTEWATER PUMPING STATION DRY WELL Pump room physically separatedfrom wet well; pumping of wastewater from a sanitary or combined sewer system through closed pumps and pipes
SANITARY SEWER Sewer transporting domestic, comercial, and industrial wastewater
COMBINED SEWER Sewer transporting domestic, commercial, and industrial wastewater and storm water
WASTEWATER PUMPING STATION WET WELLS Liquid side of a pumping station serving a sanitary sewer or combined system
14Possible ignition of flammable gases and floating flammable liquids
Possible ignition of flammable gases and floating flammable liquids
Possible ignition of flammable gases and floating flammable liquids
Buildup of vapors from flammable or combustible liquids
ABOVEGRADE WASTEWATER PUMPING STATION Pump room physically separated with no personnel access to wet well; pumping of wastewater from a sanitary or combined sewer system through closed pumps and pipes
NA 18 NR
a A
b B
a D
b C, or outdoors
c C, or outdoors
a NNV
19
20
21
ABOVEGRADE WASTEWATER PUMPING STATION pump room not physically separated from wet well; pumping of wastewater from a sanitary or combined sewer system through closed pumps and pipes
MAINTENANCE HOLES Access to sewer for personnel entry
ODOR-CONTROL SYSTEM AREAS Areas physically separated from wet well and housing systems handling wet well gases
Possible ignition of flammable gases and floating flammable liquids
Leakage and ignition of flammable gases
Possible ignition of flammable gases and floating flammable liquids
b B
a NNV
b B
INVERTED SIPHONS Depressed section of gravity sewer
Possible ignition of flammable gases and floating flammable liquids
23 NNV
CATCH BASINS (Curb inlet) Inlet where street water enters a storm or combined sewer
Buildup of vapors from flammable or combustible liquids
24 NNV
a NNV
b B
a NNV
b B
a A
b B
22
25
26
27
JUNCTION CHAMBERS Structure where sewers intersect
RESIDENTIAL DIVERSION STRUCTURES Enclosed structures where residential wastewater can be diverted
RESIDENTIAL BELOWGRADE VALVE VAULT With an exposed residential wastewater surface
RESIDENTIAL CONTROL STRUCTURES Enclosed structures where residential wastewater flow is regulated
Buildup of vapors from flammable or combustible liquids
Buildup of vapors from flammable or combustible liquids
Possible ignition of flammable gases and floating flammable liquids
Buildup of vapors from flammable or combustible liquids
a NNV
b B
a NNV
b B
ABOVEGRADE VALVE VAULT Physically separated from the wet well; valves in vault in closed piping system
NA 30 NR
a NNV
b C
a NNV
b B
a A
b B
a A
32
33
34
31
28
29
CONTROL STRUCTURES Enclosed structures where wastewater or storm water flow is regulated
RESIDENTIAL BELOWGRADE METERING VAULT With an exposed residential wastewater surface
DIVERSION STRUCTURES Enclosed structures where wastewater can be diverted
BELOWGRADE VALVE VAULT Physically separated from the wet well and with closed piping system
BELOWGRADE VALVE VAULT With an exposed wastewater surface
WASTEWATER HOLDING BASINS Enclosed structures temporarily holding untreated or
Possible ignition of flammable gases and floating flammable liquids
Buildup of vapors from flammable or combustible liquids
Possible ignition of flammable gases and floating flammable liquids
Possible ignition of flammable gases and floating flammable liquids
Buildup of vapors from flammable or combustible liquids
Possible ignition of flammable gases and floating flammable liquids
b B
WASTEWATER HOLDING BASINS LINED OR UNLINED Open structures holding storm water, combined wastewater, untreated or partially treated wastewater
NR 35 NR
a NNV
b C
a NNV
b B
COARSE AND FINE SCREEN FACILITIES (See Coarse and Fine Screen Facilities in Table 5.2.)
38
Notes:(1) The NR designation in the ventilation column indicates that no ventiliation requirements 9.1.1.4 also has no requirements.(2) Row and Line columns are used to refer to specific figures in A.4.2 and specific requirem
36
holding untreated or partially treated wastewater
BELOWGRADE METERING VAULT Physically separated from the wet well and with closed piping system
BELOWGRADE METERING VAULT With an exposed wastewater surface
37
(3) The following codes are used in this table:
Possible ignition of flammable gases and floating flammable liquids
A: No ventilation or ventilated at less than 12 air changes per hour. B: Continuously ventilated at 12 air changes per hour or in accordance with Chapter 9. C: Continuously ventilated at six air changes per hour or in accordance with Chapter 9. CGD: Combustible gas detection system. D: No ventilation or ventilated at less than 6 air changes per hour.
NC: Noncombustible material.
FDS: Fire detection system. FE: Portable fire extinguisher. LC: Limited-combustible material. LFS: Low flame spread material. NA: Not applicable.
Buildup of vapors from flammable or combustible liquids
NNV: Not normally ventilated. NR: No requirement.
NEC : In accordance with NFPA 70 .
Extent of Classified Area
NEC -Area Electrical Classification (All Class I,
Group D)
Material of Construction for
Buildings or Structres
Fire Protection Measures
NA NA In accordance with 8.3.1
NA
Inside of sewer Division 2 In accordance with 8.3.1
NR
Entire room or space Division 2 NC, LC, or LFS CGD if enclosed
Entire dry well Division 2, or unclassified, if space provided with pressurization in accordance with NFPA 496
NC, LC, or LFS FE
Entire dry well Unclassified NC, LC, or LFS FE
Not included within the scope of this standard
Not included within the scope of this standard
Not included within the scope of this standard
Within enclosed space Unclassified NR NR
Within enclosed space Unclassified NR NR
Within enclosed space Division 2 In accordance with 8.3.1
NR
Within enclosed space Unclassified In accordance with 8.3.1
NR
Entire room or space Division 2 NC, LC, or LFS CGD
Entire room or space Unclassified NC, LC, or LFS CGD
Entire room or space Division 2 NC, LC, or LFS FE
Entire room or space Unclassified NC, LC, or LFS FE
NA Unclassified NR NR
Inside of sewer Division 1 In accordance with 8.3.1
NR
Inside of sewer Division 2 In accordance with 8.3.1
NR
Inside of sewer Division 1 In accordance with 8.3.1
NR
Inside of sewer Division 2 In accordance with 8.3.1
NR
Entire room or space Division 1 NC, LC, or LFS CGD
Entire room or space Division 2 NC, LC, or LFS CGD
Entire room or space Unclassified NC, LC, or LFS FE
Entire room or space Division 2, or unclassified, if space provided with pressurization in accordance with NFPA 496
NC, LC, or LFS FE
NA Unclassified NC, LC, or LFS FE
Entire room or space Division 1 NC FE
Entire room or space Division 2 NC, LC, or LFS FE
Entire area if enclosed Division 2 NC, LC, or LFS CGD and FDS
Areas within 0.9 m (3 ft) of leakage sources such as fans, dampers, flexible connections, flanges, pressurized unwelded ductwork, and odor-control vessels
Division 2 NC, LC, or LFS CGD and FDS
Areas beyond 0.9 m (3 ft)
Unclassified NC, LC, or LFS CGD and FDS
Inside Division 1 In accordance with 8.3.1
NR
Inside Division 2 In accordance with 8.3.1
NR
Inside Division 1 In accordance with 8.3.1
NR
Open and above grade or inside and ventilated
Division 2 In accordance with 8.3.1
NR
Interior of inlet and outlet structures
Division 1 NC NR
Enclosed space Division 1 In accordance with 8.3.1
NR
Enclosed space Division 2 In accordance with Chapter 8
NR
Enclosed space Unclassified In accordance with Chapter 8
NR
Enclosed space Division 2 In accordance with 8.3.1
NR
Enclosed space Unclassified In accordance with 8.3.1
NR
Enclosed space Division 2 In accordance with Chapter 8
NR
Enclosed space Unclassified In accordance with Chapter 8
NR
Enclosed space Division 2 In accordance with 8.3.1
NR
Enclosed space Unclassified In accordance with 8.3.1
NR
Enclosed space Division 1 In accordance with Chapter 8
NR
Enclosed space Division 2 In accordance with Chapter 8
NR
NA Unclassified NC, LC, or LFS NR
Enclosed space Division 2 NC, LC, or LFS NR
Enclosed space Unclassified NC, LC, or LFS NR
Enclosed space Division 1 NC NR
Enclosed space Division 2 NC, LC, or LFS NR
Enclosed space Division 1 In accordance with Chapter 8
NR
Enclosed space Division 2 In accordance with Chapter 8
NR
Enclosed space Division 1 NC NR
Enclosed space Division 2 NC, LC, or LFS NR
NR NR NR NR
Enclosed space Division 2 NC, LC, or LFS NR
Enclosed space Unclassified NC, LC, or LFS NR
Enclosed space Division 1 NC NR
Enclosed space Division 2 NC, LC, or LFS NR
s are established for the space, and, therefore, Table
ents for each location and function.
Committee work to be looked at
Change LEL to LFL. All LFL except for two locations 7.4.5.1 and Table 5.2 Row 13. LFL is preferred NFPA term.
Chapter 2
• Need to revise 2.2 Reference to 251 NFPA, UL, and ASTM have been working together to eliminate duplicate fire test documents. The following NFPA Fire Test documents have been withdrawn and replaced with the equivalent test methods listed in the table below.
Reference to NFPA 86 needed?
Reference to NFPA 350 needed?
Chapter 3
• Define fire detection system vs fire alarm system. If detect do you have to alarm? Likely not because may not be anyone in the area. Also need to clarify Fire Protection system, may or may not include alarm, extinguishing etc. Detection may reference back to 7.5 to turn on ventilation for example…Alarms only in section 6-where people are perhaps? 4,5 only detection but does it connect to other requirements
• Definition of “on site” needed. See 4.1.2
• Activated Carbon-used only in annex • Building drain-only used in definition for building sewer • Grit Chamber-only used in annex • Combustible dust-only in definition hazardous location and annex • Explosive dust-not used in document • Screening chamber-not used in document • Utilization equipment-only in annex • Explosionproof apparatus-not used in document • Belt Filter not used in document • Vacuum filter used only in annex • Fire barrier –used only in definition of fire-rated penetration seal (which is not used in the
document)
• Fire-loading-term not used in document • Fire-rated penetration seal-term not used in document • Upper flammable limit-term not used in document • Flash dryer-term not used in document • Flocculator-term not used in document (flocculation is used) • Fluidized bed reactor-term not used in document • Sewer gas-only in annex • Hydrogen sulfide-definitions and annex only • Incineration-only in annex • Intrinsically safe-not in document • Volatile liquid-term not used in document (volatile hydrocarbons used) • Nonenclosed-term not used in the document • Ozonation-annex only • Pyrolysis-annex only • Fire resistance rating-only used in definition of fire barrier(which should be removed since
only used in fire rated penetration seal which is not used in the document) • Low flame spread RATING not used in document. Low flame spread MATERIAL used • Rotating biological contactor-only in annex • Branch sewer-only used in definition of trunk sewer • Interceptor sewer-term not used in document • Private sewer- term not used in document • Relief sewer- term not used in document • Sludge dewatering-annex only • Sludge gas vent- term not used in document • Sludge thickening-annex only • Sludge Drying system- term not used in document • Imhoff tank-annex only • Through Penetration Firestop-in title of informational reference in annex only. • Anaerobic waste treatment-not used but anaerobic wastewater treatment used…change. • Advanced (tertiary) treatment –term not used… Use TERTIARY only…change • Primary WASTEWATER treatment-term not used… Use PRIMARY treatment only…change • Secondary WASTEWATER treatment-term not used…Use SECONDARY treatment only..change • Hazardous waste- term not used in document • Domestic wastewater-term used only in definition of storm sewer
Chapter Four
• Do we want to use NNV or NR or NA-all three (If only NNV Table 4.2 rows18, 30. 35 should be NNV in ventilation column not NR. All the rest in Chapter 4 are listed as NR)
• Figure A.4.2 (f) references row 19 but should also reference row 20 for the 3 foot requirement?
• Figure A.4.2 (C)-are the top two diagrams really rows 14 and 15 and do not require CGD?
Advisory service question-What about classification of pump stations that process storm water only and are pre-treated by passing through an oil/water separator to remove flammables, oils. With or without ventilation. May need to add to table 4 for next revision cycle.
Nowhere in chapter four does it lead you to the annex figures… ie A.4.2(c) refers to lines 16 and 34 but nowhere in the chapter does it lead you to the annex material… it also does not provide you with any indication that the classified areas should be 3 and 5 feet around the vent. Could put extent of classified area to include 3 feet around vent etc right within Table 4.
Chapter 5
• Clarify Table 5.2 to allow for unclassified area if primary sedimentation already occurred and then screening takes place.
• Lines 14-16. Need to explain the extent of classified area-just tank or building or what? The extent of the classified area in the tables changes based upon the locations. In very general terms the classification is going to be dependent upon the likelihood of floating flammable materials in the wastewater stream or an accumulation of a flammable gas (e.g., methane or H2S) in an enclosed space. When you look at 5.2 Row 14 this particular area is generally unclassified if the secondary or tertiary tanks are preceded by primary sedimentation. That is the typical scenario for the
majority of plants. The only time this location is going to be classified is if the plant is designed in a way that they somehow skip the primary sedimentation process. Secondary and Tertiary tanks are almost always used near the end of the treatment process when the likelihood of a fire or explosion is minimal. We have had confusion over lines 14, 15 and 16 for years. We may need to “flip” the information in the classification column so that the more common condition is listed first or make sure during editing that a space is placed after the parenthetic note.
Chapter 6
• Table 6.2 (a) Notes under B and C “or in accordance with chapter 9” should read IN accordance with chapter 9?
• Table 6.2 (a) Row 6. Says Not Significant. Term not used or defined anywhere.
• Ventilation Requirements for Dewatering Building Question for NFPA: Unlike the previous table ventilation requirements in version 2008, NFPA is now requiring 6 air changes per hour for this type of facility. Logically if ventilation is required to protect the space from accumulation of methane a ventilation monitoring system is required to ensure the ventilation system is active. Since there are no other options (For example no ventilation if the area is classified and 6 ACH to downgrade the space to unclassified), technically this space is not being downgraded since there are no other options to downgrade from. Therefore ventilation monitoring in accordance with chapter 7 would not apply according to 7.5.1 and 7.5.2.
Glenns response- This wasn’t really “added” to the 2012 edition. We just clarified the requirement. In prior editions it was unclassified and ventilation was “N/A”. We had a discussion about whether or not there should be multiple lines for this row and ultimately decided to just go with one line and require a minimal number of air changes to ensure the area was unclassified. In may of these buildings even in colder locations, this ventilation would be pretty typical. We also decided that the storage of sludge cake typically occurred in a room or building that was different from the actual press or dewatering area. So that became a separate line. Yes, you are correct, the ventilation should be monitored. We can revisit this in the next edition and provide additional clarification either in table 6.2(a) or in Chapter 7. What about equipment such as gas booster/compressors located OUTSIDE. What type of electrical classification needed?
Glenn-I tell people to use the classifications specified around vents as a guide.
In this case since we “know” gas (under slight pressure) can possible escape from the compressor I would lean toward the distances for compressor building vents and illustrated in Figures A.6.2(d) and (e).
• Table 6.2 rows 4 and 5 deal with storm water wet and dry wells that must be physically separated and provides ventilation and electrical classifications. Row 19 deals with if NOT physically separated but it is for both storm and sanitary. Need to have recommendation when not physically separated but only stormwater.
• NFPA 86 should be the source document for determining the suitability of the drying oven and associated equipment. It should be noted that NFPA 86 section 4.1.1 requires the submission of detailed plans and specifications of the system (including safety devices) to the AHJ for final approval. In addition, NFPA 86 section 5.2.1. requires the furnace design to minimize fire and explosion hazards and section 5.3.1 requires unobstructed explosion relief for furnaces that contain combustible dusts. ( need to change Table 6.2 (b) row 1 b… so clear that ovens and dryers must meet NFPA 86.
Chapter 7
• Are Fire ext appropriate for wastewater plants or too dangerous to ask ees to fight fires?
• Clarify that Combustible Gas Detection systems are FIXED mounted-several questions on why need CGD even if class I Div I location… why need fixed mount if need to use portable gas detector to enter space etc. Need to clarify that the CGD for wet well pumping stations is for the BUILDING and not for the actual wet well itself. Do not need to install CGD inside wet well. Just building
• Look at where we require CGD… Use two terms in charts, enclosed and enclosed in structure… do we ever want a CGD INSIDE a tank? Need better definitions for the terms enclosed space and equipment enclosure as well. Should have annex explaining why we want CGD –personnel protection…. Personal monitoring will be done when entering confined space ie-tank. That is not what CGD is for… we also want to look at where we want these… maybe not in a Class 1 Div 1 location because ASSUME normally present versus Div 2 location
Chapter 9
So let’s say I have a below grade dry well with closed piping-falling under Row 2b of Table 9.1.1.4. I can unclassify the area by having 6 air changes per hour (fresh outside air)-for example 1000 cfm. I need to maintain that 6 air changes per hour so long as the space is occupied. However, now if I want to save heating cost, I can take 750 cfm of that air change and recirculate it leaving 250 cfm outside air.
Combustible gas monitoring must be done and if levels go above 10% LEL then it must revert to 100% outside air. I think I understand that and answered the question accordingly.
Here is where I get confused… Now if I look at Table 9.1.1.4 Row 2b and I have LESS than the 6 air changes per hour… lets say 900 cfm, then I would have to consider this space a Class 1 Division 2 location. In this case ,I go to 9.3.2 and I can use dual ventilation rates as long as it is not less than 50% or in this case 450 cfm outside air… This means that we are allowing LESS fresh air ventilation in a Class 1 Div 1 location than in an unclassified area
OR is this section 9.3.2 really only referring to a dual ventilation rate when referring to the Class I Div I location (therefore only referring to Rows 2a and 3a) being then DOWNGRADED to a Class I Div 2 location so that in this case we are going from 12 air changes per hour down to 6 air changes per hour. ? If this is the case do you think we need to clarify this in the next revision cycle? For example, say that dual ventilation rates can be used to change the classification of a Division 1 location to a Division 2 location if the following criteria are met. As written now it seems like we are allowing Class 2 locations to be further downgraded.
ANSWER-Can also downgrade ventilation rates per 9.3.2 for UNCLASSIFIED areas… need to change in code. Can you reduce ventilation to 50% for UNCLASSIFIED areas when temps drop (referring to row 12 of table 6.2) . This guy is reading this literally and saying that you can only have dual ventilation rates for Div 1 and Div 2 locations and NOT for unclassified areas per 9.3.2. I assume that if you can reduce the ventilation for classified areas, that you can also reduce the ventilation for UNCLASSIFIED areas when the four conditions are met.
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Annex 10.3 should say rotating biological CONTACTOR not contractor.
Dear Mr. McGinley, The purpose of this letter is to request a review of NFPA 56, Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping Systems, by your committee and consideration of incorporation of NFPA 56 by reference in your subject document. The Technical Committee on Gas Process Safety (GPS) performed a cursory review of your document. It appears that there could be inter-related issues between your subject document and NFPA 56. It has come to our attention from some committees that, although NFPA 56 addresses many important applicable issues, it may not be specific enough for the many ways that flammable liquids and gases are applied in different industries. Because of this, we suggest you review NFPA 56 and either reference it if your document does not at all address the topic of cleaning and purging piping systems, or extract relevant sections, after appropriate modifications identified by your committee. NFPA 56 applies to fire and explosion prevention during cleaning and purging activities for new and existing flammable gas piping found in electric-generating plants and in industrial, institutional, and commercial applications. NFPA 56 was developed in direct response to the explosion and subsequent fatalities at the Kleen Energy natural gas-fired power plant in Middletown, CT. (See the Chemical Safety Board report here: http://www.csb.gov/investigations/detail.aspx?SID=91&Type=2&pg=1&F_State=CT.) Following the incident, the Chemical Safety Board issued urgent recommendations to NFPA and other stakeholders requesting that a safety standard be developed to address the fire and explosion hazards related to procedures that require, by their nature, the release of flammable gases. NFPA established the GPS committee, which developed and approved for publication NFPA 56(PS). In accordance with the regulations regarding the development of provisional standards (PS), NFPA 56 was immediately entered into a full revision cycle and the second edition will be issued in mid-2013. On behalf of the GPS TC, I ask that you acknowledge receipt of this request and please let us know what action, if any, your group chooses to take. The GPS committee is willing to assist in any way, including participation in task groups, providing further explanation, and discussing further the intent of NFPA 56. We want to make sure that we make this a mutually beneficial interaction. If there are things included in NFPA 56 that are inappropriate for your application, please provide that feedback to us so that we can also continue to make NFPA 56 a stronger and more usable document for flammable gas and liquid industries. Thank you in advance for your cooperation. Sincerely, Franklin Switzer Chair, Technical Committee on Gas Process Safety
Follow up to yesterday’s conference call. Garr was right wastewater treatment has changed somewhat since we published NFPA-820 aas a standards. There are a number of newer biological treatment processes such as Sequencing Batch Reactors (SBR), Integrated Fixed-Flim Activated Sludge (IFAS), Membrane Bioreactors (MBR) or Membrane Biofilm Reactors (MBfR), and probably 2-3 dozen more. However, all of these innovative processes still fall into two categories, fixed film or suspended growth. I have looked at the descriptions in Annex B.1 to B.6 in NFPA-820 and the basic descriptions are still good. Based on yesterday’s discussion of fine screens, we might want to modify paragraph B.4.2 Suggest we modify as follows: B.4.2 Physical-Chemical Treatment. Physical-chemical treatment includes one or more physical, chemical, or a combination of unit processes to treat primary or secondary effluent. Such processes might include chemical addition, flocculation, coagulation, precipitation, fine screens, and filtration to remove suspended matter and carbon adsorption to remove soluble organics. Physical-chemical unit processes can be installed before primary treatment, after primary treatment or after secondary treatment processes. Garr was also right in that the intent of the Committee was not to reinvent the wheel, but to make use of other industry standard documents. In keeping with that premiums, we might want to consider a few modifications and additions to Annex F Information References. Suggest we consider referencing the following: NFPA – Fire Protection Handbook, 2008 edition (or current). Especially Chapter 9.11 – Protection of Wastewater Treatment Plants and maybe Chapter 9.14 – Electric Generating Plants. NFPA –Industrial Fire Hazards Handbook (I have the Third Edition –not sure NFPA is still publishing since I could not find it on the web page). Especially the chapter 20 on Wastewater Treatment Plants EPA - Primer for Municipal Wastewater Treatment Systems, EPA 832-R-04-001, United States Environmental Protection Agency, Office of Water Office Wastewater Management, Washington DC 20460, September 2004. We also talked about the need for a definition of an “On-Site System” A treatment system that serves one home, or several homes clustered together, or a small business. Treatment units usually include septic systems or small packaged plants and may include a subsurface disposal system. Other WEF documents we might include: Gravity Sanitary sewer Design and Construction MOP FD-5, third edition Pumping Station Design, third edition