Water Meter Design Criteria Manual

ENGINEERING DEPARTMENT

WATER METER DESIGN CRITERIA MANUAL &

SUPPLEMENTARY SPECIFICATONS JANUARY 2011

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Revised December 20, 2013

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City of Surrey TABLE of CONTENTS Engineering Department Page i Design Criteria Manual & Supplementary Specifications Version, January 2011

Table of Contents

INTRODUCTION ...................................................................................................................... 1

INTENT OF THE STANDARDS ............................................................................................. 1

1.0 Water Meter Design Criteria ............................................................................................ 2

1.1 Glossary Of Terms .............................................................................................................. 2

1.2 Metering Requirements ........................................................................................................ 2

A. Responsibilities ........................................................................................................... 2

B. Timing ...................................................................................................................... 3

1.3 Meter Sizing Methodology ................................................................................................... 3

1.4 Meter Selection .................................................................................................................. 4

1.5 Meter Location ................................................................................................................... 4

1.6 Meter Configuration ............................................................................................................ 5

A. Isolation Valves .......................................................................................................... 5

B. By-pass ..................................................................................................................... 5

C. Receptacles ................................................................................................................ 6

D. Chambers .................................................................................................................. 6

E. Fire Hydrants .............................................................................................................. 6

1.7 Submissions ....................................................................................................................... 6

Supplementary Specifications ................................................................................................... 1

1.0 PRODUCTS........................................................................................................................ 1

2.0 EXECUTION ..................................................................................................................... 4

3.0 SUPPLEMENTARY DETAIL DRAWINGS (APPENDIX B) ...................................... 5

Appendices

APPENDIX A Water Meter Sizing Calculation Sheet and Example

APPENDIX B Supplementary Detailed Drawings

City of Surrey Engineering Department WATER METERS Page 1 Design Criteria Manual Version, January 2011

INTRODUCTION This document outlines the City’s requirements for the installation of cold-water meters on municipal water services. It is divided into two separate parts the Design Criteria and the Supplementary Specifications

.

INTENT OF THE STANDARDS The Design Criteria

are intended to provide direction to the Applicant and Applicant’s Engineer on the elements required to be considered in the design of new water meter installations. It is intended to be used in conjunction with the City of Surrey Design Criteria Manual.

The Supplementary Specifications are intended to provide direction to the Applicant and Applicant’s Engineer on the specifications that must be incorporated into building servicing contracts for the installation of new water meters. The Supplementary Specifications

are to be used in conjunction with the City of Surrey Supplementary Specifications document and the City approved edition of the Master Municipal Construction Document (MMCD).


1.0 WATER METER DESIGN CRITERIA 1.1 Glossary Of Terms

“Applicant” Refers to a property Owner, Developer, or authorized agent who makes an application for connection to a water service.

“Applicant’s Engineer” Refers to a professional engineer hired by the Applicant to

design the installation of the meter. “ASTM” Refers to the American Society for Testing and Materials. “AWWA” Refers to the American Water Works Association. “City” Means the City of Surrey. “CSA” Means the Canadian Standards Association. “Developer” Means person(s) or organization(s) developing property as

per City guidelines. “General Manager, Means the General Manager or their appointed designate of Engineering” the Engineering Department of the City; “Owner” Means the property Owner as defined by the latest Surrey

Waterworks Regulation By-law. “Chamber” or “Pit” Means the below ground meter enclosure.

1.2 Metering Requirements

A.

Responsibilities

The Surrey Waterworks Regulation and Charges By-law, 2007, No. 16337 (as amended) identifies that all new service connections require water meters. For new connections, the installation of a meter is triggered by an ‘Application for Building’ or ‘Plumbing Permit’. This requirement for a meter applies to:

• connections to a new or existing service; • temporary service connections; and • connections that include an underground irrigation system.


For all new connections, the Applicant must supply and install all piping, fittings, meter chamber(s) / vault(s) and equipment.

The City supplies and installs meters of sizes 19 mm (¾inch) for single-family and duplex residential construction. In all other cases, the meter is supplied and installed by the Applicant.

Backflow prevention devices although not covered within this section are to be installed in accordance with City of Surrey Cross Connection Control Bylaw, 2007, No. 16355 (as amended).

B. Timing

For single family residential dwellings water meter chambers, setters and lids are to be installed to final grade by the Applicant in advance of the Drainage, Water and Ventilation Inspection (DWV). Water meters, installed by the City, are to be installed after the DWV approval but in advance of the Final Plumbing Inspection. The meter area must be kept free and accessible at all times in order to permit the installation of the meter. The Applicant is responsible for the protection of installation from damage and must repair any damage that occurs to the chamber, setter, meter, or lid. For meters servicing other uses the meters must be installed prior to turning on the water supply to the site. In the case where a drawing submission is required (see Section G) installation of the water service, chamber, or meter within private property should not begin prior to the approval of the drawings.

1.3 Meter Sizing Methodology

For all single family residential homes without fire sprinklers the water meter size shall be 19mm except in the case where the Applicant’s Engineer can demonstrate the need for a larger meter. All other meters should be sized in accordance with AWWA M22 Sizing Water Service Lines and Meters and form contained in Appendix A. It should be noted that this methodology is based on the fixture value method and not the fixture unit

method employed in the BC Building Code for piping within buildings.

The maximum operating range for a water meter shall be less than 80% of the maximum instantaneous flow capacity as outlined by the meter manufacturer, with a maximum pressure loss of 48 kPa (7 psi) at the design flow rate. The size selection should not compromise the operating range or the long term life of the meter and must ensure that pressures supplied to the property are appropriate for the intended use.


For developments that are proposed to be phased, the meter chamber and piping must be sized for the meter required for the ultimate buildout of the development. However, the initial meter installed must be sized to accurately capture the range of flows for the first phase.

It is expected that in most cases the water meter size will be at least 1-2 sizes smaller than the water service connection, providing they meet the size selection criteria. The Applicant’s Engineer must ensure the meter selection and installation requirements are appropriate for the designed application.

1.4 Meter Selection

Only one domestic meter is to be supplied per property unless otherwise approved by the General Manager, Engineering. The only exception is duplex units where two separate domestic meters are to be provided.

Only those meters outlined in the Supplementary Specifications will be considered by the City, unless otherwise approved by the General Manager, Engineering.

Unless otherwise approved a separate fire service line must be supplied to each property that employs fire sprinklers or onsite fire hydrants. The fire service line must be equipped with metering technology to detect unauthorized use of water in accordance with AWWA standards and applicable City and Provincial codes through the use of a double check detector valve assembly. All other uses that require service from the potable water system (including domestic, process, and irrigation) must be serviced from the domestic service line with tees and branches located after the water meter. The exception to this is for single family residential homes that employ fire sprinklers. In this case a combined service is acceptable but the meter must not be less than 38mm in size.

1.5 Meter Location

All meters 50mm and smaller must be located at the property line in a chamber in accordance with the Supplementary Detail Drawings, unless otherwise approved by the General Manager, Engineering. For property line installations the meter box or vault must be located on private property 300mm from the property line and 300mm from the shut off. Where the water main is within private property, in a right-of-way, the meter box or vault should be placed outside the right-of-way. An area at least 1.0 m horizontal and 2.0m vertical around the meter box or vault should be free of major landscaping or objects, including shrubs, etc., to facilitate the future maintenance work of the meter installation. Grading of the area around the chamber must ensure positive drainage away from the chamber.


1.6 Meter Configuration

The general configuration for meter installations has been illustrated in the Supplementary Detail Drawings. For all non-positive displacement meters 50mm and larger, configuration details shall be determined by the Applicant’s Engineer and outlined in the design drawings. When the meter is installed within a building the installation should be within reasonable distance of a floor drain. The floor drain must be suitable sized to accept the high flows associated with meter testing (25 l/s). Under no circumstances is a meter to be installed in a bathroom or a bedroom. A space of at least 1.0 m in front of the meter shall be free of obstruction to allow for convenient servicing and testing of the meter at all times. No electronic, mechanical and water sensitive equipment or machinery should be placed or installed under the meter installation or in an area where splash or flow from the meter settings or pipes could occur during the servicing of the meter. For all non-positive displacement meters 50mm and greater adequate straight length pipe should be provided upstream and downstream of the meter in order to comply with manufacturer’s recommendations for maximum accuracy. Bypass tees and isolation gate valves may be located within the straight length distance in accordance with manufacturer’s recommendations. A restrained coupling must be provided on the downstream side of the meter for flexibility in case of meter removal.

A.

Isolation valves, must be in the same chamber as the meter and are required to be installed upstream and downstream of the meter assembly. All valves, for meters 75mm and larger, with the exception of the lockable bypass must be capable of being operated above ground without entering the chamber through a cored hole in the lid.

Isolation Valves

B.

A locking bypass is required to be installed on all 50mm and larger non-positive displacement meters. The bypass shall be 50mm with the following exceptions:

By-pass

• Combined fire service line meters, where approved, bypasses must be full sized;

and • Facilities with critical flow requirements with bypass sized to ensure impacts

are minimized during meter maintenance.

After testing the installation, the by-pass valve must be closed and sealed by the installer.


By-passes must not be located above the meter in a chamber setting, however, rotating them 45 degrees is permitted if space governs.

C.

For meters installed at the property line, remote register receptacles must be mounted in the chamber lid. The remote register must be of the same manufacturer as the meter.

Receptacles

For inside installations, where approved, wall mounted remote receptacles should be located approximately 1.2 meters above grade (ground) and easily accessible for reading. They shall not be located within locked fenced areas. Where possible these should be located adjacent to gas or electric meters.

All receptacles shall be touch pad technology (digital readouts are not acceptable).

D.

Meter chambers, or where specifically approved above ground enclosures, must meet the requirements of the Supplementary Specifications, and be selected to provide adequate space for removal and testing of all equipment within the meter. Access lids, latches, and ladders must comply with the current requirements of the Workers Compensation Board and provide adequate space for testing and removal of meters and where applicable backflow prevention devices.

Chambers

Thrust beams must be designed for all chambers housing equipment 75mm or larger to ensure that the force caused by a closed valve is transferred to the full width of the chamber. The Applicant’s Engineer shall ensure that the chamber manufacturer is in agreement with the thrust bearing area on the chamber.

All chambers for non-positive displacement meters must be equipped with a sump and drained by either a gravity connection to the storm sewer or where this is not possible by an electric sump pump. The Owner is responsible for providing power to the sump pump in accordance with the BC Electrical Code.

E.

All on-site hydrants must be located after the site premise back flow prevention device.

Fire Hydrants

1.7 Submissions

Plans must be submitted by the Applicant as part of the plumbing permit application for all meter installations. This application must be accompanied by a site plan that includes:


i. Scale (1:500 Site Plan, 1:250 Chamber Layout) ii. Location of meter chamber relative to overall site development plan (dimensioned

from property corner) iii. Future phasing of the project iv. Meter size, type, and Manufacturer v. Demand flow calculations/requirements in accordance with Appendix A (for

meters larger than 50mm) vi. Chamber drain type

vii. Site specifics (ie. building use type and specifics) viii. Onsite fire system (hydrants, fire sprinklers)

ix. Irrigation systems

For all non-positive displacement meter installations 50mm and larger, the Applicant’s Engineer must provide detailed sealed drawings and shop drawings of the installation and relevant calculations, to demonstrate the appropriateness of the sizing of the meter, for approval prior to installing the meter.

City of Surrey Engineering Department WATER METERS Page SS-1 Supplementary Specifications Version, January 2011

SUPPLEMENTARY SPECIFICATIONS

1.0 PRODUCTS

1.1 Water Meters .1 .2

Unless a variation is justified, the City will only accept approved makes and models of meters for all metering applications including double check detector meters. In all cases of variation, approval must be obtained from the General Manager, Engineering to use a different type of meter. All meters must be new. Used or reconditioned meters are not acceptable. All meters must meet the following requirements:

• Must meet appropriate AWWA standards • Must be capable of 95% accuracy at low flows less than or

equal to 0.95 l/min (0.25 usgpm) • Must utilize a single register on all meter types

Displacement meter base plates shall be cast iron. Meters 38 mm (1½ inches) and larger in diameter must have bolt flanged ends.

Table 1 – Acceptable Meters Manufacturer Model

Sensus SRII1 SR1 (50mm only) iPERL OMNI C22

Neptune T-101 Elster C-7001

1. Approved for use on detector check valves. 2. Approved for residential combined fire service.

NOTE: Alternate meters may be accepted but must be

approved by the General Manager, Engineering.

1.2 Registers .1

Meters must have encoder-type remote-registration conforming to the latest version of AWWA C707. Registers using generator pulses or low voltage conversions are not permitted. Power requirement for data transmission must be supplied by an interrogation device. Registers must be compatible with interrogation equipment supplied by Sensus, Neptune and Logicon.


.2 .3 .4 .5 .6

The register must provide at least six-digit visual registration at the meter. The units must be registered in cubic meters (m3). The units, the month and year of manufacture, and other identification information must clearly be printed on the face of the register. The register must also have a full test sweep hand or dial. The register must, in a digital format, simultaneously encode at least six significant digits of the meter reading for transmission through the remotely located receptacle. A meter identification number must also be provided with each reading. For the purposes of billing, electronic registration must return registration (meter read) to the nearest cubic meter. All registers must be programmed with a multiplier of 1.0. All registers must be provided with factory podded moisture protection for internal components suitable for operation in flooded or humid pit/chamber conditions. All registers for meters 75mm and larger must have integral data logging capabilities. Battery life must be guaranteed for a minimum of 10 years.

1.3 Remote Receptacles

.1 .2 .3 .4 .5 .6

Remote receptacles must either be wall or pit mount style. Remote receptacles must not include a remote display. There must be no data storage or power source in the remote receptacle. The materials employed must be corrosion resistant, resistant to ultraviolet degradation, unaffected by rain or condensation, and compatible with rugged service and expected life. Wall mounted receptacles must be designed for terminal screw connection after being fastened to the wall. Excess wire must be looped and mounted on the wall adjacent to the meter. Design of the unit must be such that it provides for mechanical and electrical connection between the receptacle and interrogation equipment. Interrogation must be achieved by inductive coupling without physical connection of the reading device. The location where the receptacle is mounted should freely be accessible by the meter reader/City Staff.


1.4 Radios 1.5 Pipe and Fittings

.1 .2 .1 .2

Where radio read technology is approved by the City for installation the radios must be capable of communicating with registers supplied by Sensus, Neptune and Elster. Radios must be capable of being read by a drive by unit or fixed based system. Connections 75mm (3inches) in diameter and greater must be restrained to the City water main. All pipe material within chambers shall be ductile iron, Schedule 80 PVC, C900 PVC, polyethylene or Type K copper. All products must be approved for potable water application. All joints within the chamber must be restrained (ie. Flanged, glued, welded, threaded).

1.6 Valves .1 .2

Valves, except for lockable bypass valves, up to 50mm (2 inches) in diameter must meet AWWA C800, and must have bronze case with National Pipe Threaded (NPT), soldered, compression type or flange connections. Valves may be ball or cylinder type using rubber o-ring seals. Actuation is to be by a curb-stop-style operating nut. All bypass valves must have a lock wing on the operating nut and the case. Valves over 50mm in diameter on domestic service must be ductile iron, resilient seat, with non-rising stem (NRS), gate valves with flanged ends, and must meet AWWA C509. Stem seal to be o-ring type. Actuation of valves must be accessible by a valve key from the surface by a standard 50mm square-operating nut. In all possible and appropriate instances a Nelson style valve box must be installed over buried valves. The only exception is where the buried valves are located within the driveway in which case a Brookes 37 box or approved equal is to be employed. All valves on fire service lines must comply with NFPA and Fire Code requirements. All 50mm by-pass valves must be brass (inside) or stainless steel (chamber) with locking lever (MA Stewart or approved equal).

1.7 Flange Adaptors .1 Flange adapters for 38mm (1 ½ inches) to 200mm (8 inches) sizes must conform to AWWA C219.


1.8 Bolts and Nuts .1 Bolts and nuts must be stainless steel - to ASTM F-599 or F-731 for bolts, and ASTM F-574 or F-836 for heavy hex nuts. Threads, fit, and dimension must conform to AWWA C111.

1.9 Meter Chambers .1 .2 .3

Meter pits and vaults must be pre-cast chambers or where specifically approved by the General Manager, Engineering heated stainless steel or fibreglass enclosures on concrete pads. Lids/covers must be capable of withstanding H-20 static loading (except where lids are located in travelling surfaces where H-20 dynamic loading applies) and be equipped with 45mm (1 ¾ inches) holes for mounting the remote receptacles. These holes must be sealed until the installation of the receptacles. Lids for positive displacement or residential magnetic meters must be cast iron with hole for touch pad. Lids for non-positive displacement meter installations must be aluminum spring assisted and divided into multiple sections where the dimensions exceed 900mm in any direction. Manhole access is not acceptable unless approved by the General Manager, Engineering. Exterior of all chambers must be damp proofed by applying an asphalt emulsion coating to all exterior surfaces. Construction joints must be made water tight with an appropriate sealant. All pipe entrances on the vault must be sealed and waterproof.

2.0 EXECUTION

2.1 Meter Installation

.1 .2 .3 .4

Meters must be installed horizontally with the register casing plumb, facing upward. For single family residential dwellings the meter should be centered as much as possible in the chamber. Meters, valves, and bypasses should be supported with appropriate steel pipe stands. Meter installations must be checked for leakage at completion of the installation. Assembly should be flushed and air must be eliminated from the system. By running water through the meter and performing a visual check of the low-flow indicator, the proper operation of the meter should be established. For all temporary connections, meters are required and must be installed at the upstream end of the connection. Insulation blankets must be installed for all single family installations.


2.2 Receptacle Installation

.1 .2

Wall mounted remote receptacles must be located where possible near the gas or electric meter approximately 1.2 meters above grade (ground) and easily accessible for reading. The communication cable (wire) from the meter to the receptacle must be installed in accordance with the manufacturer’s instructions and must not exceed recommended length. Cable must be run neatly in horizontal or vertical directions only, in an approved casing or duct. Buried casing/duct should be at least 600mm deep. A drilled 10mm (3/8 inch) diameter hole, sealed with sealing compound, at external face of the receptacle must be provided. For meters installed at the property line, remote register receptacles must be mounted in the meter box or chamber lid according to the manufacturer’s instructions. Pit (chamber) mounted receptacles must be mounted to the meter box lid in a single 45mm (1 ¾ inches) hole. The pit mounted receptacle(s) must be provided with a minimum length of 1800mm (6 feet) of 22-gauge three-colour (red, green, black) wire, connected and sealed at the receptacle without terminal exposure. Remote wiring connections must either be factory or field sealed to ensure waterproof connections.

3.0 SUPPLEMENTARY DETAIL DRAWINGS (APPENDIX B) .1

.2

SSD-WM1 Meter Chamber Schematic for Meters 25mm Diameter and Smaller SSD-WM2 Meter Chamber Schematic for 38mm and 50mm Positive Displacement

D38

Line

D38

Line

City of Surrey WATER METERS Appendix A Engineering Department Page 1 Design Criteria Manual & Supplementary Specifications Version, January 2011

Appendix A – Water Meter Sizing Calculation Sheet and Example

Revised: 10-01-2013

Page 1/3

Water Meter Sizing Calculation SheetFor Non-Fire Service Meters

Methodology: AWWA M22

Customer Name:Address:PID Number: Project Number:BP Number:

Type of Occupancy: Multifamily Institutional Industrial

Commercial Other

No. of Strata Units

Is this a Phased Development: Yes No

Calculations Presented Below are for: Phase __ Buildout

Seperate calculations must be provided for both current phase and buildout

Step 1. Calculate Customer Total Fixture ValuesFixture Value (gpm) No. of Fixture

Fixture @ 414 kPa (60 psi) Fixtures Value (gpm)

Bathtub 8 X =Bedpan Washers 10 X =Bidet 2 X =Dental Unit 2 X =Dishwasher 2 X =Drinking Fountain - Public 2 X =Hose Bibs (c/w 50 ft Wash Down) - 1/2 inch 5 X = - 5/8 inch 9 X = - 3/4 inch 12 X =Kitchen Sink 2.2 X =Lavatory 1.5 X =Showerhead (Shower only) 2.5 X =Service Sink 4 X =Toilet - Flush Valve 35 X = - Tank Type 4 X =Urinal - Pedestal Flush Valve 35 X = -Wall Flush Valve 16 X =Wash Sink (Each Set of Faucets) 4 X =Washing Machine 6 X =Other:

X =X =X =X =

Combined Fixture Value Total gpm (A)

Revised: 10-01-2013

Page 2/3

PID Number:

Step 2. Calculate Customer Unadjusted Peak Demand

Customer Peak Demand From Fig. 4-2 or 4-3 = gpm (B)

Step 3. Apply Pressure Adjustment Factor for Domestic Demand

The pressure on the discharge side of the pressure reducing valve (PRV) or booster pump (if applicable seerequired additional information) shall be applied if a PRV or booster pump exists inside the property.

____ kPa (____ psi) Pressure Factor From Table 4.1 (C)

Customer Adjusted Peak Demand (B X C) = gpm (D)

Step 4. Confirm Underground Irrigation Demand Total Irrigation Flow = gpm (E)

Larger irrigation areas should be divided into zones with a maximum irrigation flow of 50 gpm.If the irrigation flow is greater than 50 gpm, the Applicant's Engineer shall provide a detailed irrigation planwith appropriately designed zones.

Step 5. Confirm Design Flow Design Flow (Greater of D & E) = gpm (F)

Step 6. Size and Select Water Meter

Meter size based on ( F < 80% of Meter Rated Peak Instantaneous Flow) mm (G) Meter size based on maximum 48 kPa (7 psi) presssure drop at Design Flow mm (H)

Water Meter Size (Greater of G & H) mm

Water Meter Make & Model:

Inside or Outside Installation

(2" (50mm) and smaller meters must be located outside at property line)

Water Service Connection Size (for information) mm

Water Meter Sizing Professional Certification

Name: Created Date:Company: Revised Date:

Comments:

Revised: 10-01-2013

Page 3/3

PID Number:

Required Additional Information (if applicable):

A) Booster pump demandThe Applicant's Engineer shall provide the duty point of the pump including the typical operating flow and pressure on the discharge side of the pump.

Typical Operating Booster Pump Flow = gpm Booster Pump Discharge Pressure = psi

Typical operating flows and discharge pressures shall be provided for each and every pump for property's containing multiple buildings.

Note: The City may request pump specifications and design information for confirmation purposes if the flow indicated above is significantly greater than the domestic demand.

B) Storage TanksIs there a storage tank on the property: Yes No

City of Surrey WATER METERS Appendix B Engineering Department Page 1 Design Criteria Manual & Supplementary Specifications Version, January 2011

Appendix B – Supplementary Detailed Drawings

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Documents

Water Meter Design Criteria Manual