02553 NATURAL GAS DISTRIBUTION - DeCA - Design ：02553天然气分布算法
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SECTION 33 51 00
NATURAL-GAS DISTRIBUTION
(Edited from DeCA June 2013 Design Criteria)
PART 1 - GENERAL
1.1 SUMMARY
A. Section Includes:
1. Piping.
2. Valves.
3. Service regulators.
4. Service meters.
5. Concrete bases.
1.2 DEFINITIONS
A. Gas Main:
1. Utility's natural gas piping.
B. Gas Distribution:
1. Piping from gas main to individual service-meter assemblies. C. Service-Meter Assembly:
1. Piping, valves, service regulator, service meter and specialties.
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D. Point of Delivery:
1. Piping outlet from service-meter assembly.
E. Natural Gas Piping:
1. Piping that conveys natural gas from point of delivery to natural gas utilization devices
inside the building.
F. HDPE:
1. High Density Polyethylene plastic.
1.3 PERFORMANCE REQUIREMENTS
A. Minimum Working-Pressure Ratings:
1. Piping and Valves: 100 psigminimum, unless otherwise indicated.
2. Service Meters: 10 psigminimum, unless otherwise indicated.
3. Service Regulators: 65 psig minimum, unless otherwise indicated. 1.4 SUBMITTALS
A. Product Data:
1. Pipe and fittings.
2. Valves.
3. Service regulators. Indicate pressure ratings and capacities.
4. Service meters.
B. Shop Drawings:
1. For natural gas service piping and service meter assembly. Include plans, elevations,
sections, details, and attachments to other work. C. Operation and Maintenance Data:
1. For the following natural gas distribution equipment and accessories to include in
emergency, operation, and maintenance manuals.
a. Service Meters.
b. Service Regulators.
D. Submittal List:
Reference Submittal Item Quantity Action
1.4A Product Data X R
1.4B Shop Drawings X R
1.4C Operation and Maintenance Data X I
X Submit quantity specified in Division 01 Section ADMINISTRATIVE REQUIREMENTS.
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R Review each submittal, mark to indicate action taken, and return.
I Submittal is for information or record purposes only. No action will be taken.
1.5 QUALITY ASSURANCE
A. Comply with requirements of utility supplying natural gas and with authorities having jurisdiction
for natural gas systems. Comply with NFPA 54 for materials, installation, testing, inspection,
and purging.
1.6 DELIVERY, STORAGE, AND HANDLING
A. Handling Flammable Liquids: Remove and legally dispose of liquids from drips in existing gas
piping. Handle liquids to avoid spillage and ignition. Notify gas supplier. Do not leave
flammable liquids on premises overnight. Store HDPE pipes and valves protected from direct
sunlight.
1.7 PROJECT CONDITIONS
A. General:
1. Perform site survey, research public utility records, and verify existing utility locations.
Contact utility-locating service for area where Project is located.
2. Interruption of Existing Natural Gas Service: Do not interrupt natural gas service to
facilities occupied by Owner or others unless permitted under the following conditions
and then only after arranging to provide purging and startup of gas supply according to
requirements indicated:
3. Notify Contracting Officer no fewer than five days in advance of proposed interruption of
natural gas service.
4. Do not proceed with interruption of natural gas service without Contracting Officer’s
written permission.
1.8 COORDINATION
A. Coordinate connection to gas main with utility. Coordinate natural gas distribution with other
utility Work.
PART 2 - PRODUCTS
2.1 PIPES AND FITTINGS
A. Refer to Part 3 "Piping Applications" Article for applications of pipe, fitting, and joining materials. B. Steel Pipe: ASTM A 53/A 53M, black steel, Schedule 40, Type E or S, Grade B.
1. Malleable Iron Fittings: ASME B16.3, Class 150, standard pattern.
2. Unions: ASME B16.39, Class 150, malleable iron with brass-to-iron seat, ground joint,
and threaded ends.
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C. HDPE Pipe:
1. ASTM D 2513, SDR 11.
a. HDPE Fittings: ASTM D 2683, socket type or ASTM D 3261, butt type with
dimensions matching ASTM D 2513, SDR 11, HDPE pipe.
D. Transition Fittings:
1. Manufactured pipe fitting with one HDPE pipe end for heat-fusion connection to HDPE
pipe and with one ASTM A 53/A 53M, Schedule 40, steel pipe end for threaded
connection to steel pipe.
E. Service-Line Risers:
1. Manufactured HDPE pipe fitting with HDPE pipe inlet for heat-fusion connection to
underground HDPE pipe; HDPE pipe riser section with protective-coated, anodeless,
steel casing and threaded outlet for threaded connection to aboveground steel piping. 2.2 JOINING MATERIALS
A. Components, Tapes, Gaskets, and Bolts and Nuts: Suitable for natural gas and as
recommended by piping manufacturer.
2.3 SHUTOFF VALVES
A. Shutoff Valves, General:
1. Manual operation, suitable for natural gas service, and with 100-psig minimum working-
pressure rating.
B. Ball Valves:
1. Bronze body, with chrome-plated brass ball; lever handle; and complying with ASME B
584, MSS SP-110, UL 842. Include locking device.
C. HDPE Valves:
1. Made for gas distribution, with nut or flat head for key operation; and complying with
ASME B16.40, UL 842.
D. Valve Boxes:
1. Cast-iron, two-section box. Include top section with cover with "GAS" lettering, bottom
section with base to fit over valve and barrel 5 inchesin diameter, and adjustable cast-iron
extension of length required for depth of bury. Include tee-handle, steel operating wrench
with socket end fitting valve nut or flat head and with stem of length required to operate
valve.
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2.4 SERVICE REGULATORS
A. Description:
1. Natural gas service regulator complying with ANSI Z21.80 or DIR 006.3-listed for service
regulators.
a. Construction: Single-stage, steel-jacketed, corrosion-resistant diaphragm type.
Include atmospheric vent and elevation compensator.
b. Pipe Connections: NPS 2and Smaller: Threaded.
2.5 SERVICE METERS
A. Service Meters, General:
1. Positive-displacement gas meter.
a. Construction: Metal case with temperature compensation, and corrosion-resistant
internal components.
b. Pipe Connections: NPS 2and Smaller: Threaded.
B. Small-Capacity Service Meters:
1. ANSI B109.1, diaphragm type, with registration in cubic feetfor meters with capacities of
500 cfhand less.
C. Large-Capacity Service Meters:
1. ANSI B109.2, diaphragm type, with registration in cubic feetfor meters with capacities of
more than 500 cfh
D. Service-Meter Bars:
1. Malleable- or cast-iron frame for supporting service meter. Include offset swivel pipes,
nuts with O-ring seal, factory- or field-installed dielectric unions, and threaded ends.
a. Exception: Omit offset swivel pipes if dimensions match meter connections. E. Service-Meter, Bypass Fitting:
1. Ferrous, tee pipe fitting with integral ball check valve and capped side inlet for temporary
natural gas supply.
PART 3 - EXECUTION
3.1 EARTHWORK
A. Refer to Division 31 Section EARTHWORK for excavating, trenching, and backfilling.
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3.2 PREPARATION
A. General:
1. Close equipment shutoff valves before turning off gas to premises or piping section.
2. Inspect natural gas piping according to NFPA 54 or International fuel gas code to
determine that natural gas utilization devices are turned off in piping section affected.
3. Comply with NFPA 54 or International fuel gas code requirements for prevention of
accidental ignition.
3.3 PIPING APPLICATIONS
A. General:
1. Flanges, unions, and transition and special fittings with pressure ratings same as or
higher than system pressure rating may be used, unless otherwise indicated.
2. Aboveground Piping: NPS 2and Smaller: Steel pipe, malleable-iron fittings, and
threaded joints.
3. Underground Piping: HDPE pipe, HDPE fittings, and heat-fusion joints.
4. Underground-to-Aboveground Piping Connections: Service-line riser.
5. HDPE-to-Steel Piping Connections: Transition fitting.
3.4 VALVE APPLICATIONS
A. General:
1. Drawings indicate types of shutoff valves to be used. If specific types are not indicated,
the following requirements apply:
a. Connections to Existing Gas Piping: Use valve and fitting assemblies made for
tapping gas mains.
b. Underground: Use HDPE valves.
c. Aboveground, NPS 2and Smaller: Ball valves.
3.5 PIPING INSTALLATION
A. General:
1. Install underground, natural gas distribution piping buried at least 36 inchesbelow finished
grade.
2. Install underground, PE, natural gas distribution piping according to ASTM D 2774.
3. Install underground, PE, natural gas distribution piping at entrance to and under part of
building in steel piping protective conduit that is vented to outside.
4. Drips and Sediment Traps: Install drips at points where condensate may collect,
including service-meter outlets. Locate where readily accessible to permit cleaning and
emptying. Do not install where condensate would be subject to freezing.
a. Construct drips and sediment traps using tee fitting with bottom outlet plugged or
capped. Use nipple a minimum length of 3 pipe diameters, but not less than 3
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incheslong and same size as connected pipe. Install with space below bottom of
drip to remove plug or cap.
5. Terminate service-regulator horizontal vents or horizontal vent piping with reducing-elbow
fittings with large end as outlet. Install fitting outlet turned down with corrosion-resistant
insect screen in outlet.
3.6 SERVICE-METER ASSEMBLY INSTALLATION
A. General:
1. Install service-meter assemblies aboveground on building wall.
2. Install metal shutoff valves upstream from service regulators. Shutoff valves are not
required at second regulators if two regulators are installed in series.
3. Install service regulators with vent outlet horizontal or facing down. Install screen in
outlet if not integral with service regulator.
4. Install metal shutoff valves upstream from service meters. Install dielectric fittings
downstream from service meters.
5. Install service meters downstream from pressure regulators.
6. Install pressure-relief or pressure-limiting devices so they can be readily operated to
determine if devices are free of debris, tested to determine pressure at which they will
operate, and examined for leakage if closed.
3.7 VALVE INSTALLATION
A. General:
1. Install PE shutoff valves on branch connections to existing underground, natural gas
distribution piping. Install valves with valve boxes.
2. Install metal shutoff valves on aboveground, natural gas distribution piping. 3.8 CONNECTIONS
A. General:
1. Drawings indicate general arrangement of piping, fittings, and specialties.
2. Connect gas distribution piping to natural gas source and extend to service-meter
assemblies and points indicated. Connect to building's natural gas piping if it is installed;
otherwise, terminate piping with caps, plugs, or flanges, as required for piping material.
3. Install unions, in piping NPS 2and smaller, adjacent to each valve and at final connection
to each piece of equipment having threaded pipe connection.
4. Connect to utility gas main according to utility's procedures and requirements.
5. Install aboveground, natural gas distribution piping upstream from equipment shutoff
valves, electrically continuous, and bonded to grounding electrode according to NFPA 70.
6. Do not use natural gas distribution piping as grounding electrode.
3.9 LABELING AND IDENTIFYING
A. Equipment Nameplates and Signs:
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1. Install engraved plastic-laminate equipment nameplates and signs on or near each
service regulator and service meter.
B. Text:
1. In addition to identifying unit, distinguish between multiple units, inform operator of
operational requirements, indicate safety and emergency precautions, and warn of
hazards and improper operations.
C. Warning Tapes:
1. Arrange for installation of continuous, underground, detectable warning tape over natural
gas distribution piping during backfilling of trenches for piping.
2. Refer to Division 31 Section Earthwork for warning tapes.
3.10 PAINTING
A. Paint exposed metal piping, valves, service regulators, service meters and meter bars, and
piping specialties except units with factory-applied paint or protective coating. Damage and
Touchup: Repair marred and damaged factory-applied finishes with materials and by
procedures to match original factory finish.
3.11 FIELD QUALITY CONTROL
A. Test, inspect, and purge natural gas distribution according to requirements of fuel gas code and
utility. Repair leaks and defective valves and specialties and retest system until no leaks exist.
Report results in writing. Verify correct pressure settings for service regulators.
END OF SECTION
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