CONSTRUCTION SPECIFICATION 15090 - Mathers …€¦ · Web viewWhere the word "ducting" is used in this Specification and on the drawings, ... (ASTM) Standards referenced within

PROCESS AND UTILITY SHEET METALSECTION 15090

Tabl e of Contents

1. GENERAL..................................................................21.1. WORK INCLUDED.....................................................................................21.2. RELATED SPECIFICATIONS..........................................................................21.3. SYSTEM DESCRIPTION AND NOMENCLATURE...................................................21.4. REFERENCES...........................................................................................31.5. QUALITY ASSURANCE................................................................................41.6. SUBMITTALS............................................................................................41.7. DELIVERY, STORAGE AND HANDLING............................................................41.8. PROJECT SITE CONDITIONS.........................................................................51.9. SEQUENCING/SCHEDULING.........................................................................51.10. ALTERNATES...........................................................................................51.11. WARRANTY.............................................................................................5

2. PRODUCTS................................................................62.1. GENERAL...............................................................................................62.2. DUCTING MATERIALS.................................................................................62.3. FLEXIBLE CONNECTIONS FOR PROCESS AIR FANS............................................6

3. EXECUTION...............................................................73.1. GENERAL REQUIREMENTS..........................................................................73.2. INSTALLATION/APPLICATION/ERECTION..........................................................73.3. INSPECTION, TEST, AND ACCEPTANCE.........................................................103.4. CLEANING.............................................................................................103.5. PAINTING..............................................................................................10

4. TYPICAL DUCTING STANDARDS................................114.1. CARBON STEEL DUCT – CD1...................................................................114.2. FILAMENT WOUND THERMOSETTING PIPE DUCT – PD1.................................124.3. STAINLESS STEEL DUCT – SD1................................................................134.4. STAINLESS STEEL DUCT – SD2................................................................144.5. TABLE 15090-1 DUCTING STANDARDS BY SERVICE.....................................154.6. TABLE 15090-2 ROUND FLANGE DIMENSIONS............................................164.7. TABLE 15090-3 RECTANGULAR FLANGE DIMENSIONS..................................184.8. TABLE 15090-4 RECTANGULAR FLANGE DIMENSIONS..................................194.9. TABLE 15090-5 ROUND DUCT GAGE SELECTION FOR GALVANIZED STEEL (SPIRAL

SEAM GAGE)........................................................................................204.10. TABLE 15090-6 ROUND DUCT GAGE SELECTION FOR GALVANIZED STEEL

(LONGITUDINAL SEAM GAGE)...................................................................21

Latest Revision 04/13/10 - 1 - Process and Utility Sheet MetalThe Hershey Company Specification 15090

General

1. GENERAL1.1. Work Included

A. This Specification outlines the minimum requirements for the procurement, fabrication, erection and testing of process and utility sheet metal. This includes all labor, supervision, tools, equipment and materials necessary for a complete, permanent and operational installation.

1.2. Related SpecificationsA. The following are related specifications:

Spec. No. TitleSpecification 15070 Process and Utility PipingSpecification 15145 Hangers and SupportsSpecification 15195 Piping and Valve IdentificationSpecification 15200 Penetration of Building ElementsSpecification 15270 Process and Utility InsulationSpecification 15940 Process and Utility Equipment

1.3. System Description and NomenclatureA. This Specification, along with the Contract Drawings, defines the minimum system requirements

for process and utility sheet metal, chutes, spouts, ducting and sheet metal specialties. Where the word "ducting" is used in this Specification and on the drawings, this shall be interpreted to mean all process and utility sheet metal work, chutes, spouts, and ducting.

B. Only a signed change order or addendum shall authorize modifications, alterations, exceptions, or additions to this Specification.

C. This Specification and the Contract Drawings are complementary in that any requirement defined by one shall be the same as if explicitly defined by all. If conflicting system requirements are defined by this Specification and the drawings submitted with this Specification, or if the Contractor has any question regarding the system requirements, the Contractor shall immediately notify Hershey for written clarification prior to proceeding with any related work.

1. The piping and instrumentation diagrams (P&ID) identify each piece of ductwork with a duct designation comprised of four parts. An example is:

ADR-28003-12-SD1

ADR Service designation. (Air Process, Dryer).

28003 Line number where, 280 03

Number for the ducts on that particular P&ID drawing.

280 P&ID sheet number of the drawing on which the duct originates.

12 Nominal size of round ducting in inches.

SD1 Ducting material specification (See Table 1). On the detailed mechanical equipment arrangement drawings, the material identifier may be omitted.


General

The designation for rectangular ducting:

ADR-28003-12X16-SD1

Is comprised of the same parts used for circular ducting except that 12 x 16 are the outside dimensions of fabricated rectangular or square ducting.

TABLE 1 - Material Codes

Code Material

AD Aluminum and aluminum alloys

FD Carbon steel -low and intermediate alloys

PD Plastic and fiberglass

SD Stainless steels

XD Special

1.4. ReferencesA. Specific editions of Engineering Standards incorporated in this Specification by reference are shown

in the following lists. Any materials furnished by or work performed by the Contractor shall meet these standards. It is the contractor’s responsibility to make sure the latest version of the particular spec is being used.

B. The following is a list of American National Standards Institute (ANSI) Standards referenced within this section:

ANSI Std. No. Title

B1.1 Unified Inch Screw Threads (UN and UNR Thread Form)

B16.1 Cast Iron Pipe Flanges and Flanged Fittings

B18.2.1 Square and Hex Bolts and Screws (Inch Series)

B18.2.2 Square and Hex Nuts (Inch Series)

C. The following is a list of American Society for Testing and Materials (ASTM) Standards referenced within this Specification:

ASTM Std. No. Title

A240/240M Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet and Strip for Pressure Vessels and for General Applications

A283/283M Standard Specification for Low and Intermediate Tensile Strength Carbon Steel Plates

A563 Standard Specification for Carbon and Alloy Steel Nuts

D2000 Standard Classification System for Rubber Products in Automotive Applications


General

D. The following is a list of Manufacturer's Standardization Society of the Valves and Fitting Industry (MSS) Standards referenced within this Specification:

MSS Std. No. Title

SP-58 Pipe Hangers and Supports - Materials, Design, Manufacture, Selection, Application, and Installation

SP-69 Pipe Hangers and Supports - Selection and Application (ANSI-approved American National Standard)

SP-89 Pipe Hangers and Supports -Fabrication and Installation Practices

E. Sheet Metal and Air Conditioning Contractor's National Association, Inc. (SMACNA) Standards

F. American Society of Heating, Refrigeration and Air Conditioning Engineers, Inc. (ASHRAE) Standards.

1.5. Quality Assurance A. Skilled craftsmen regularly engaged in the appropriate trade shall do all work.

B. All materials and equipment furnished by the Contractor shall conform to the gages and standards specified and shall be new and free from defects. No materials or equipment, whether furnished by the Contractor or others, shall be installed or used in a fabrication assembly if the items are physically damaged or functionally defective.

C. All work performed by the Contractor shall be of good quality and done in a safe manner. The Contractor shall not perform any work during periods in which environmental or site conditions may adversely affect the serviceability of the installation. The Contractor shall not damage an existing installation or work being performed by others. If conflicts arise, the Contractor shall immediately report them to Hershey for resolution. Any work performed by, or materials installed by the Contractor found to be unsatisfactory shall be corrected by the Contractor at the Contractor's expense.

1.6. SubmittalsA. All submittals shall be in accordance with the requirements outlined by Hershey.

B. If the materials and methods of installation to be used are in compliance with the standards, submission of samples or data to confirm compliance is not required. If the Contractor proposes material or methods not exactly as specified, but intended to be of equal or better quality and performance, then catalog data sheets, samples and other supporting information shall be submitted for Hershey's review in accordance with the requirements outlined by Hershey.

C. The Contractor shall submit for review shop drawings of design details and supports of housing assemblies.


General

1.7. Delivery, Storage and HandlingA. Material shall be delivered to the job site in the original manufacturer's package. The materials shall

be factory-stamped or tagged with the manufacturer's identification number along with any Hershey's tag number if applicable.

B. Before accepting any materials on the job site, the Contractor shall inspect the materials. Any materials found to be damaged, defective or unsuitable for the intended service shall not be accepted.

C. Materials shall be stored at the job site in a manner that will not damage, deface, or otherwise reduce the serviceability of the materials. Materials that are susceptible to weather damage shall be stored in a weatherproof environment. All materials shall be stored with the manufacturer's identification attached.

D. All handling of materials shall be done in accordance with the manufacturer's recommendation and in a manner that will not damage or reduce the serviceability of the material.

1.8. Project Site ConditionsA. The Contractor shall ensure that temperature and other environmental conditions are favorable for all

material installations.

1.9. Sequencing/SchedulingA. All sequencing and scheduling of work to be performed under this Specification shall be in

accordance with the agreement negotiated by Hershey for Contractor Services, including all exhibits and attachments to the agreement.

1.10. Alternates A. The Contractor may suggest alternates covering each of the following subjects:

1. Alternative materials or equipment to improve quality, schedule or pricing.

2. Exceptions to the standards covering materials, manner of application, or other details.

B. If the Contractor has suggested changes or modifications to the system requirements, the Contractor shall submit, in writing, a description of the proposed changes or modifications for review by Hershey.

C. The information shall include catalog data sheets as a minimum, and shop drawings, samples, and other supportive information as necessary for Hershey to evaluate the proposed materials.

D. Hershey shall review alternative recommendations and shall be the sole judge in determining whether the proposed material, accessory, or item meets the stated criteria for service and conditions imposed.

E. The Contractor shall not proceed with any proposed changes or modifications until authorized to do so by Hershey in writing. The cost of any work performed on proposed changes or modifications without Hershey's written approval will be at the Contractor's expense, as well as any cost for correcting such unauthorized work.


General

1.11. WarrantyA. Warranty of work to be performed under this Specification shall be in accordance with the

agreement negotiated by Hershey for Contractor Services, including all exhibits and attachments to the agreement.


Products

2. PRODUCTS2.1. General

A. Materials shall conform to the standards specified, shall be new, free from defects and imperfections, and shall be of recent manufacture. Materials not covered by detailed standards shall be ‘standard’ products of reputable manufacturers and suitable for intended use. Materials shall be ‘standard’ cataloged products, commercially available.

B. Hershey reserves the right to reject any material if it has not been demonstrated to its satisfaction that the requirements of this Specification have been met.

C. No asbestos is permitted in any item.

D. No spiral wound ducting shall be used.

2.2. Ducting MaterialsA. A complete list of Ducting Services, Duct Numbers, and Duct Standards is shown in Table 15090-1

(page 17).

1. Three typical Duct Standards are listed in the Tables section at the end of Section 4 Typical Ducting Standards. Duct Standards will vary widely from application to application based upon the pressures exerted on the duct, temperatures, velocity of the media, and the media being handled. Each application must be individually designed based upon these variables and the latest ASTM Standards and should minimally include the type of information listed in these Typical Standards.

B. Materials are specified by ASTM designations. Specific editions of standards incorporated in this Specification by reference are shown in Section C, References. Any materials furnished shall meet these standards. Applicable SMACNA Sheet Metal Standards shall apply where these ducting standards give the minimum thickness in U.S. Standard Gage. Specific reference is not made to other standards.

2.3. Flexible Connections for Process Air FansA. Fabricate in accordance with SMACNA Duct Construction Standards, and as indicated, using

"Ventglas" fabric. The fabric must be fire resistant, waterproof and mildew resistant with a weight of approximately 30 ounces per square yard. Provide a minimum of 1/2 inch slack in the connections, and a minimum of 2-1/2 inches distance between the edges of the ducts. Also provide a minimum of one-inch slack for each inch of static pressure on the fan system. Securely fasten fabric to apparatus and to adjacent ductwork by means of stainless steel flats or draw bands.


Execution

3. EXECUTION3.1. General Requirements

A. General

1. Check connections to equipment, ducting components, and instruments and provide matching ducting connections as required. Determine the connection dimensions from manufacturer's "certified prints" or from actual field measurements.

2. Ducting connections to tanks, equipment, etc. shall be made in such a manner so they do not cause damage to the equipment during connection and after the equipment is in operation.

3. Wherever the drawings call for a tie-in to existing systems, the Contractor shall be re-sponsible for adjusting or modifying any existing system which may be affected by the tie-in. This shall be done at no additional cost. The Contractor shall coordinate with Hershey for scheduled shutdown of existing services for tie-in.

4. Certain ducting specialties may be furnished with Hershey purchased Equipment Packages. These furnished items are so indicated on the Contract Drawings. The Contractor shall accept and install any of these items which appear in ducting furnished under this Specification.

5. The Contractor shall identify all ducting provided under this Specification in accordance with the requirements of Specification 15195, Piping and Valve Identification.

B. Field Measurements

1. The Contractor shall field check all dimensions shown on the drawings and the "certified" equipment drawings and resolve any discrepancies before starting the work.

2. The Contractor shall verify all dimensions in the field as necessary and be responsible for the proper dimensions and alignment of the finished ducting. Interferences noted shall be brought in writing to the attention of Hershey.

3.2. Installation/Application/ErectionA. Accurately fabricate and install ducting or transitions in true alignment and within tolerances of the

best practice for this type of work. Impose no strain on equipment due to the misalignment of the ducting. All ductwork systems shall be fabricated in accordance with SMACNA High Pressure Duct Construction Standards and the Drawings, unless otherwise noted.

B. Fabricate ducting and transitions with butt-welded joints using the latest methods, techniques, and recommendations of the American Welding Society.

C. Where flanged connections are used to join individual sections, adjoining sections shall be butted squarely and bolted together with flanges continuously welded to the mating pieces inside, continuously welded outside, and spaced to allow adequate gasketing. Flange dimensions are given in Table 15090-2 (page 18), 15090-3 (page 20), and 15090-4 (page 21).


Execution

D. Provide standard-type flexible connections, where shown on the drawings. Use materials suitable for the service conditions and operating temperatures of connected equipment.

E. Unless otherwise shown on the drawings, elbows shall be fabricated with a minimum centerline radius of 1-1/2 times the process sheet metal width in the turning plane for rectangular sheet metal, and with a minimum centerline radius of 1-1/2 diameters for round sheet metal. Furnish smooth elbows of five-piece, 90 degree elbows and three-piece, 45 degree elbows. Fittings shall be of fully welded construction.

F. Provide transitions as shown on the drawings. Make minimum length of transition equal to 1-1/2 times the larger rectangular dimension or diameter of the sheet metal.

G. Branches shall be 45 deg. lateral type connections, or conical type in more restricted spaces. All fittings shall be of fully welded construction.

H. Hangers and Supports

1. Furnish and install all hangers, supports, anchors, guides, and auxiliary supporting steel to eliminate excessive vibration and control movement due to thermal expansion, and to properly and adequately support all ducting and ducting equipment. Materials shall conform to MSS SP-58 and SP-69.

2. The material in contact with the ductwork shall be compatible with the ductwork material so that neither shall have a deteriorating action on the other. Connect support components to auxiliary supporting steel by bolting. Drill bolt holes and saw cut ends; do not use cutting torch. Bolt support components to concrete with expansion shields in predrilled holes. Do not use lead anchors. Shot-in anchors are not permitted.

a. Attach support components where they will not damage other construction. Support ducting from building structure, and independent of ceiling sheathing. Use wall brackets only where wall is suitable for support. No ducting shall be supported from equipment or from piping nor shall one duct support any other duct, or item of equipment. All ductwork in non-sanitary areas should be supported in accordance with SMACNA High Pressure Duct Construction Standards. Refer to Specification 15145 covering Hangers and Supports for additional details.

3. Bolts of duct flanges, equipment, etc. shall not be used for the anchoring of duct supports.

4. Install spring hangers, anchors, restraints, and guides as shown on the drawings and at other locations resulting from thermal expansion and/or contraction considerations.

5. Determine intended movement of ductwork by noting location of spring hangers, anchors, restraints, guides, and/or equipment connections on drawings.

6. All bolts, U bolts, and studs used for duct supports and hangers shall be double-nutted.

7. Provide lateral supports as required to prevent movement of ducting.

8. Hangers and supports shall be installed using the guidelines as stated in the Manufacturer's Standardization Societies Standard and Practices SP-89.

9. Connection to Building Steel


Execution

a. Weld or bolt support attachments parallel to the web of the building structural steel.

b. Use welders qualified in accordance with Specification 15070, Process and Utility Piping. Weld 1/2" stiffener plate to structural steel flanges that are less than 1/2" thick. Weld 1/2" stiffener plate to structural steel flanges where hanger rods are greater than 1-1/2" in diameter.

c. When connections are bolted to building structural steel, use bolts conforming to ASTM A307, Grade B and nuts conforming to ASTM A563, Grade A. Drill the bolt holes required for support attachments. Do not flame cut bolt holes. Do not use clamps for connections to structural steel.

d. Provide intermediate structural steel as required where building structural steel is not adequate.

10. Connections to Building Concrete

a. Where concrete inserts are not used, bolt support attachments to structural concrete using expansion anchors. Expansion anchors shall be nonlead-type, Molly Parabolt. Use care to prevent damage to structures during and after installation.

b. Provide inserts where required and as shown on the Contract Drawings for placement in the concrete form work covered under Specification for Concrete Work.

c. Provide intermediate structural members as required to limit suspension member length to a maximum of eight feet. Hershey shall review structural member design. No suspension member in excess of eight feet in length shall be permitted without prior approval from Hershey.

11. Suspension Members

a. Install suspension members so they are plumb and location is maintained as shown on the drawings when ducting is at operating conditions. Limit vertical misalignment to four degrees when ducting is at ambient conditions.

b. Thread length on threaded hanger rods shall not exceed five rod diameters. Do not use "all thread" rods.

12. Equipment Protection

a. Install hangers relative to mechanical equipment in such a manner that equipment will not carry any duct load.

I. Provide openings for ducting through walls, floors, and roofs under this Specification in accordance with the requirements of Specification 15200, Penetration of Building Elements, and as shown on the drawings. Where ducts pass through roofs or exterior walls, provide suitable flashing to prevent rain or air currents from entering the building.

J. Provide clearance for valve discs in full open position on each side of valves.

K. Provide one inch NPT capped drain coupling at low points of all wet service ducting.


Execution

L. During construction, provide temporary closures of metal or taped polyethylene on open ductwork to prevent construction dust from entering the ductwork system.

M. Duct housings shall be fabricated in accordance with SMACNA duct construction standards unless otherwise indicated on drawings. Housings transitions inline coils. Filters etc. shall be fabricated in assemblies that can be brought into the facility for installation. Contractor shall design and fabricate housing supports in accordance with SMACNA. Submit shop drawings and/or fabrication drawings of housing assemblies and supports to Hershey for approval prior to fabrication.

N. Access Doors

1. Fabricate in accordance with SMACNA Duct Construction Standards unless otherwise indicated on drawings. Review locations with Hershey prior to fabrication. Fabricate rigid and close fitting doors with sealing gaskets and quick fastening locking devices. For insulated ductwork, install minimum one inch thick elastomeric insulation, double walled access doors. Access doors with sheet metal screw fasteners are not acceptable.

2. Doors shall be of the same material as ductwork.

3. Install doors for access before and after filters, coils, and dampers a minimum of every 20 feet of straight duct and elsewhere as indicated on the Contract Drawings. Door size will be shown on Contract or Drawings.

4. Contractor shall submit drawings indicating locations and numbers of access doors prior to beginning fabrication.

3.3. Inspection, Test, and AcceptanceA. All materials, accessories and methods of installation and fabrication are subject to inspection by

Hershey during any phase of the work.

B. The Contractor shall request that Hershey make a visual examination of complete ducting installation. Any defects observed shall be corrected and the Contractor shall make a request for a new examination. This procedure shall be repeated until Hershey accepts the installation.

C. A leakage test shall be performed on all ductwork systems in accordance with SMACNA Air Duct Leakage Test Manual.

D. Upon installation acceptance, a final operational acceptance shall be performed at a time that is satisfactory to Hershey. The operational demonstration, witnessed by Hershey, shall prove that all conditions of the Contract Documents have been fulfilled. If proven, Hershey shall give a written acceptance notice. If rejected, the necessary corrections shall be made and the operational demonstration shall be repeated until acceptance is obtained.

3.4. CleaningA. All ducting and equipment shall be installed clean and free of grease, oil, mud, dirt, and construction

debris. Take special precautions to prevent the entrance of foreign matter during the construction phases. Should foreign matter enter the ducting or equipment, disassemble, clean, and reassemble.


Execution

3.5. PaintingA. The Contractor shall prime-paint all carbon steel ducting, hangers, supports, and auxiliary carbon

steel required by this Specification with a universal primer, 2 mils dry film thickness. Paints shall not contain lead or chromates.


Typical Ducting Standards

4. TYPICAL DUCTING STANDARDS4.1. Carbon Steel Duct – CD1

COMPONENTS THICKNESS DESCRIPTION

Straight Section 20 USG Cold-rolled carbon steel sheets, commercial quality, Class I (exposed) matte finish, not oiled

Elbows and Fittings

20 USG Cold-rolled, carbon steel sheets, commercial quality, Class I (exposed) matte finish, not oiled

Flanges See Table 15090-2 Carbon steel plates and angles for dimensions

Gaskets 1/4" Black Neoprene Sheet

Bolts and Nuts Carbon steel, hex head bolts, heavy, semi-finished hex nuts. Zinc plated.

SPECIFICATIONS MATERIAL ASTM DIMENSIONAL ANSI

Straight Sections A366 --

Elbows and Fittings A366 --

Flanges A283, Grade C or D --

Gaskets D2000, Grade 1BC420 --

Bolts and Nuts A307, Grade B B18.2.1; B18.2.2

Bolt Threads -- B1.1



4.2. Filament Wound Thermosetting Pipe Duct – PD1MATERIAL SIZE DESCRIPTION

Ducting 18" - 48" Filament-wound reinforced thermosetting total vinyl ester w/40 mil liner resin pipe

Fittings 18" - 48" Filament-wound, material to match pipe butt-and-wrap ends

Flanges 18" - 48" Filament-wound, material to match pipe, flat face, Class 125 flange drilling

Gaskets 1/8" Thick Buna-N, full-faced

Bolts and Nuts Cadmium-plated carbon steel, hex-head bolts. Heavy semi-finished cold punched hex nuts

STANDARDS

Pipe, fittings, flanges and joining materials as manufactured by A. O. Smith-Inland Inc., Big Thread, Type LVV; Operating Temperature 220 deg. F; Design Pressure 150 psig.Bolts and nuts shall be in accordance with ASTM A307, Gr. B, with dimensions per ANSI B18.2.1, B18.2.2, B16.1, and B1.1.Use washers on all bolts.



4.3. Stainless Steel Duct – SD1COMPONENTS THICKNESS DESCRIPTION

Ducting 10 USG Hot-rolled stainless steel sheet

Elbows and Fittings 10 USG Hot-rolled stainless steel sheet


Gaskets 1/4" White Neoprene Sheet, FDA approved


STANDARDS MATERIAL ASTM DIMENSIONAL ANSI

Ducting A240, Type 304 No. 1 Finish

Elbows & Fittings A240, Type 304 No. 1 Finish

Flanges A283, Grade C or D

Gaskets D2000, Grade 1BC420

Bolts A307, Grade B B18.2.1

Bolt Threads ------ B1.1

Nuts A563, Grade A B18.2.2



4.4. Stainless Steel Duct – SD2COMPONENTS THICKNESS DESCRIPTION

Ducting 14 USG Hot-rolled stainless steel sheet

Elbows and Fittings 14 USG Hot-rolled stainless steel sheet


Gaskets 1/4" White Neoprene Sheet, FDA approved


STANDARDS MATERIAL ASTM DIMENSIONAL ANSI

Ducting A240, Type 304 No. 1 Finish

Elbows & Fittings A240, Type 304 No. 1 Finish

Flanges A283, Grade C or D

Gaskets D2000, Grade 1BC420

Bolts A307, Grade B B18.2.1

Bolt Threads ------ B1.1

Nuts A563, Grade A B18.2.2

Notes:1. Shutoff or balancing damper. Low leakage butterfly damper with neoprene seal, shaft seal, and

external manual operating handle. Stainless steel construction, flanged connections. Ruskin Model CDR 92.



4.5. Table 15090-1 Ducting Standards by ServiceTABLE 15090-1

DUCTING STANDARDS BY SERVICE

DUCT NO. SERVICE WET/DRY DUCT SPECIFICATION



4.6. Table 15090-2 Round Flange DimensionsTABLE 15090-2

ROUND FLANGE DIMENSIONS

DUCTSIZE

FLANGEO.D.

FLANGETHICKNESS

BOLTCIRCLE

NO. OFBOLTS

BOLT HOLESIZE

BOLTSIZE

3” 7” 3/8” 5” 4 7/16" 3/8"

4” 8” 3/8” 6” 8 7/16" 3/8"

5” 9” 3/8” 7” 8 7/16" 3/8"

6” 10” 3/8” 8” 8 7/16" 3/8"

7” 11” 3/8” 9” 8 7/16" 3/8"

8” 12” 3/8” 10” 8 7/16" 3/8"

9” 13” 3/8” 11” 12 7/16" 3/8"

10” 14” 3/8” 12” 12 7/16" 3/8"

11” 15” 3/8” 13” 12 7/16" 3/8"

12” 16” 3/8” 14” 12 7/16" 3/8"

13” 17” 3/8” 15” 12 7/16" 3/8"

14” 18” 3/8” 16” 12 7/16" 3/8"

15” 19” 3/8” 17” 16 7/16" 3/8"

16” 20” 3/8” 18” 16 7/16" 3/8"

17” 21” 3/8” 19” 16 7/16" 3/8"

18” 22” 3/8” 20” 16 7/16" 3/8"

19” 23” 3/8” 21” 20 7/16" 3/8"

20” 24” 3/8” 22” 20 7/16" 3/8"

22” 26” 3/8” 24” 20 7/16" 3/8"

24” 28” 3/8” 26” 20 7/16" 3/8"

26” 30” 3/8” 28” 24 7/16" 3/8"

28” 32” 3/8” 30” 24 7/16" 3/8"

30” 34” 3/8” 32” 28 7/16" 3/8"

32” 36” 3/8” 34” 28 7/16" 3/8"

34” 38” 3/8” 36” 32 7/16" 3/8"

36” 40 3/8” 38” 32 7/16" 3/8"

38” 42” 3/16” 40-1/4” 20 7/16" 3/8"

40” 44” 3/16” 42-1/4” 20 7/16" 3/8"

42” 46” 3/16” 44-1/4” 22 7/16" 3/8"

44” 48” 3/16” 46-1/4” 22 7/16" 3/8"

46” 50” 3/16” 48-1/4” 24 7/16" 3/8"



TABLE 15090-2ROUND FLANGE DIMENSIONS

DUCTSIZE

FLANGEO.D.

FLANGETHICKNESS

BOLTCIRCLE

NO. OFBOLTS

BOLT HOLESIZE

BOLTSIZE

48” 52” 3/16” 50-1/4 24 7/16" 3/8"

50” 55” 3/16” 52-3/4 26 7/16" 3/8"

52” 57” 3/16 54-3/4 26 7/16" 3/8"

54” 59” 3/16” 56-3/4 28 7/16" 3/8"

56” 61” 3/16” 58-3/4 28 7/16" 3/8"

58” 53” 3/16” 60-3/4 30 7/16" 3/8"

60” 65” 3/16” 62-3/4 30 7/16" 3/8"



4.7. Table 15090-3 Rectangular Flange DimensionsTABLE 15090-3

RECTANGULAR FLANGE DIMENSIONS

DUCTSIZE

FLANGEO.D.

FLANGETHICKNESS

BOLTCIRCLE

NO. OFBOLTS

BOLT HOLESIZE

BOLTSIZE

38” 42” 3/16" 40-1/4" 20 7/16" 3/8"

40” 44” 3/16" 42-1/4" 20 7/16" 3/8"

42” 46” 3/16" 44-1/4" 22 7/16" 3/8"

44” 48” 3/16" 46-1/4" 22 7/16" 3/8"

46” 50” 3/16" 48-1/4" 24 7/16" 3/8"

48” 52” 3/16" 50-1/4" 24 7/16" 3/8"

50” 55” 3/16" 52-3/4" 26 7/16" 3/8"

52” 57” 3/16" 54-3/4" 26 7/16" 3/8"

54” 59” 3/16" 56-3/4" 28 7/16" 3/8"

56” 61” 3/16" 58-3/4" 28 7/16" 3/8"



4.8. Table 15090-4 Rectangular Flange DimensionsTABLE 15090-4

RECTANGULAR FLANGE DIMENSIONS

DUCT SIZELONGERSIDE

ANGLE THICKNESS BOLT HOLE SIZE

BOLT SIZE

Up to 5" 1” x 1” 10 USG 5/16” 1/4”

6 thru 11” 1-1/4” x 1-1/4” 1/8” 5/16” 1/4”

12 thru 15” 1-1/2” x 1-1/2” 3/16” 7/16” 3/8”

16 thru 24” 2”x 2” 3/16” 7/16” 3/8”

26 thru 30” 2” x 2-1/2” 3/16” 7/16” 3/8”

32 thru 36” 2” x 2-1/2” 3/16” 7/16” 3/8”

38 thru 60” 2” x 3” 1/4” 7/16” 3/8”



4.9. Table 15090-5 Round Duct Gage Selection for Galvanized Steel (Spiral Seam Gage)

TABLE 15090-5ROUND DUCT GAGE SELECTION FOR

GALVANIZED STEEL(SPIRAL SEAM GAGE)

Duct Size inInches

Maximum WGStatic Positive

Spiral Seam Gage

Maximum 10” WGStatic Positive

Spiral Seam Gage

Maximum 2” WGStatic Negative

Spiral Seam Gage3" thru 8" 28 Gage 26 Gage 28 Gage

9" thru 14" 28 Gage 26 Gage 26 Gage







4.10. Table 15090-6 Round Duct Gage Selection for Galvanized Steel (Longitudinal Seam Gage)

TABLE 15090-5ROUND DUCT GAGE SELECTION FOR

GALVANIZED STEEL(LONGITUDINAL SEAM GAGE)

Duct Size inInches

Maximum WGStatic Positive

Longitudinal Seam

Maximum 10” WGStatic Positive

Longitudinal Seam

Maximum 2” WGStatic Negative

Longitudinal Seam3" thru 8" 28 Gage 24 Gage 24 Gage






STANDARDS

SMACNA HVAC Duct Construction Standards-latest edition

Metal thicknesses will vary widely from application to application based upon the pressures exerted on the duct temperatures, velocity of the media, and the media being handled. Each application must be individually designed based upon these variables and the latest ASTM Standards.
