1、10-11 33 51 00-1 SECTION 33 51 00 NATURAL-GAS DISTRIBUTION SPEC WRITER NOTE: Delete / _ / if not applicable to project. Also delete any other item or paragraph not applicable in the section and renumber the paragraphs. PART 1 - GENERAL 1.1 DESCRIPTION A. This section specifies materials and procedur
2、es for the construction of outside underground gas distribution system for / natural / manufactured / mixture of natural and manufactured / gas, complete, ready for operation, including cathodic protection if required, all appurtenant structures, and connections to new building structures and to exi
3、sting gas supply. This specification does not apply to LPG distribution systems. 1.2 RELATED WORK A. Excavation, Trench Widths, Pipe Bedding, Backfill, Shoring, Sheeting, Bracing: Section 31 20 00, EARTH MOVING. B. Submittals: Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA AND SAMPLES. C. General plu
4、mbing, protection of Materials and Equipment, and quality assurance: Section 22 05 11, COMMON WORK RESULTS FOR PLUMBING D. Where soil resistivity is less than 4000 ohm-cm or when required by gas utility, Section 26 42 00, CATHODIC PROTECTION. E. Metering: SECTION 25 10 10, ADVANCED UTILITY METERING
5、SYSTEM. 1.3 DEFINITIONS SPEC WRITER NOTE: Add definitions as necessary for project clarity. A. Exposed, Exterior Installations: Exposed to view outdoors or subject to outdoor ambient temperatures and weather conditions. Examples include rooftop locations. 1.4 ABBREVIATIONS A. HDPE: High-density poly
6、ethylene plastic B. PE: Polyethylene plastic C. WOG: Water, oil and gas D. NRTL: National recognized testing laboratory Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 33 51 00-2 1.5 DELIVERY, STORAGE, AND HANDLING SPEC WRITER NOTE: Retain firs
7、t paragraph below for projects involving existing systems. A. Remove and dispose of liquids from existing natural-gas piping according to requirements of authorities having jurisdiction. B. Deliver pipes and tubes with factory-applied end caps. Maintain end caps through shipping, storage, and handli
8、ng to prevent pipe end damage and to prevent entrance of dirt, debris, and moisture. C. Store and handle pipes and tubes having factory-applied protective coatings to avoid damaging coating, and protect from direct sunlight. D. Protect stored PE pipes and valves from direct sunlight. 1.6 COORDINATIO
9、N A. Coordinate connection to natural-gas main with Utility Company. B. Coordinate sizes and locations of concrete bases with actual equipment provided. C. Coordinate exterior utility lines and connections to building services up to the actual extent of building wall. 1.7 QUALITY ASSURANCE: A. Produ
10、cts Criteria: 1. When two or more units of the same type or class of materials or equipment are required, these units shall be products of one manufacturer. 2. A nameplate bearing manufacturers name or trademark, including model number, shall be securely affixed in a conspicuous place on equipment.
11、In addition, the model number shall be either cast integrally with equipment, stamped, or otherwise permanently marked on each item of equipment. B. Comply with the rules and regulations of the Utility Company having jurisdiction over the connection to public natural-gas lines and the extension, and
12、/or modifications to public utility systems. 1.8 APPLICABLE PUBLICATIONS SPEC WRITER NOTE: Based on project design for local conditions, delete references not applicable for project. A. The publications listed below form a part of this specification to the extent referenced. The publications are ref
13、erred in the text by basic designation only. B. American National Standards Institute (ANSI): Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 33 51 00-3 B31.8-2010 . Gas Transmission and Distribution Piping Systems B109.1-92 Diaphragm-Type Gas
14、Displacement Meters (Under 500-Cubic-Feet-per-hour Capacity) B109.2-2000 Diaphragm-Type Gas Displacement Meters (500-Cubic-Feet-per-hour Capacity and over) B109.3-92 Rotary-Type Gas Displacement Meters IAS LC 1-2005 Fuel Gas Piping Systems Using Corrugated Stainless Steel Tubing (CSST) Z21.18-07/CSA
15、 6.3-07 . Gas Appliance Pressure Regulators Z21.21-2005/CSA 6.5 Automatic Valves for Gas Appliances Z21.41-2003/CSA 6.9 Quick Disconnect Devices for Use with Gas Fuel Appliances Z21.75-2007/CSA 6.27 . Connectors for Outdoor Gas Applications and Manufactured Homes Z21.80a-2005/CSA 6.22a . Line Pressu
16、re Regulators, Addenda 1 to Z21.80-2003/CSA 6.22 C. American Petroleum Institute (API): Spec 6D-2010 . Pipeline Valves D. American Society of Civil Engineers (ASCE): 25-06 Earthquake Actuated Automatic Gas Shutoff Devices E. American Society of Mechanical Engineers (ASME): B1.20.1-1983 . Pipe Thread
17、s, General Purpose, Inch B1.20.3-2008 . Dryseal Pipe Threads (Inch) B16.3-2006 . Malleable Iron Threaded Fittings: Classes 150 and 300 B16.5-2009 . Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard B16.9-2007 . Factory-Made Wrought Buttwelding Fittings B16.11-2009 Forged
18、 Fittings, Socket-Welding and Threaded Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 33 51 00-4 B16.20-2007 Metallic Gaskets for Pipe Flanges: Ring-Joint, Spiral-Wound, and Jacketed B16.26-2006 Cast Copper Alloy Fittings for Flared Copper Tub
19、es B16.33-2002 Manually Operated Metallic Gas Valves for use in Gas Piping Systems up to 125 psi (Sizes NPS 1/2 through NPS 2) B16.34-2009 Valves - Flanged, Threaded and Welded End B16.38-2007 Large Metallic Valves for Gas Distribution Manually Operated, NPS 2-1/2 (DN 65) to NPS 12 (DN 300), 125 psi
20、g (8.6 bar) Maximum B16.39-2009 Malleable Iron Threaded Pipe Unions: Classes 150, 250, and 300 B16.40-2008 Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems B18.2.1-2010 . Square, Hex, Heavy Hex, and Askew Head Bolts and Hex, Heavy Hex, Hex Flange, Lobed Head, and L
21、ag Screws (Inch Series) B31.8-2010 . Gas Transmission and Distribution Piping Systems MFC-4M-1986 Measurement of Gas Flow by Turbine Meters F. American Society of Safety Engineers (ASSE): 1079-2005 Dielectric Pipe Unions G. American Society for Testing and Materials (ASTM): A53/A53M-10 Pipe, Steel,
22、Black and Hot-Dipped, Zinc-Coated, Welded and Seamless A126-042009) . Gray Iron Castings for Valves, Flanges, and Pipe Fittings A234/A234M-11 Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and High Temperature Service Provided by IHSNot for ResaleNo reproduction or networking p
23、ermitted without license from IHS-,-,-10-11 33 51 00-5 A312/A312M-11 Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes B210-04 Aluminum and Aluminum-Alloy Drawn Seamless Tubes B241/B241M-10 Aluminum and Aluminum-Alloy Seamless Pipe and Seamless Extruded Tube B584-11 Copper A
24、lloy Sand Castings for General Applications D2513-11e1 . Polyethylene (PE) Gas Pressure Pipe, Tubing, and Fittings D2517-06 . Reinforced Epoxy Resin Gas Pressure Pipe and Fittings D2683-10 . Socket-Type Polyethylene Fittings for Outside Diameter-Controlled Polyethylene Pipe and Tubing D2774-08 . Und
25、erground Installation of Thermoplastic Pressure Piping D3261-10a Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing E84-11 . Standard Test Method for Surface Burning Characteristics of Building Materials H. American Water Works Association (AWWA): C203-
26、08 Coal-Tar Protective Coatings and Linings for Steel Water Pipelines - Enamel and Tape - Hot Applied I. American Welding Society (AWS): A5.8/A5.8M:2004 Filler Metals for Brazing and Braze Welding D10.12/D10.12M:2000 Guide for Welding Mild Steel Pipe J. Manufacturers Standardization Society (MSS): S
27、P-78-2005 . Gray Iron Plug Valves Flanged and Threaded Ends Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 33 51 00-6 SP-110-2010 Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends K. National Fire Protection Agency (N
28、FPA): 54-2009 National Fuel Gas Code 70-2011 National Electric Code L. Society of Automotive Engineers (SAE): J513-199901 Refrigeration Tube Fittings - General Specifications *HS-150/2000* M. Underwriters Laboratories (UL): UL 429-2010 Electrically Operated Valves 1.9 WARRANTY A. The Contractor shal
29、l remedy any defect due to faulty material or workmanship and pay for any damage to other work resulting therefrom within a period of / one year / two years / from final acceptance. Further, the Contractor will furnish all manufacturers and suppliers written guarantees and warranties covering materi
30、als and equipment furnished under this Contract. PART 2 - PRODUCTS SPEC WRITER NOTE: Delete sections not applicable to project. 2.1 PIPES, TUBES, AND FITTINGS A. Steel Pipe: Steel pipe shall be as per ASTM A53, black steel, Schedule 40, / Type E / or / Type S /, Grade B. Copper tubes are not allowed
31、 by code for natural gas distribution in the United States. B. Fittings: SPEC WRITER NOTE: Select type of fitting for project. Remove rest of section. 1. Malleable-Iron Threaded Fittings shall meet ASME B16.3, / Class 150 / or / Class 300 /, standard pattern. Threaded joints are not permitted except
32、 at valve connections. 2. Butt weld fittings shall be wrought steel, per ASME B16.9. 3. Wrought-Steel Welding Fittings shall meet ASTM A234 for butt welding and socket welding. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 33 51 00-7 4. Union
33、s shall be ASME B16.39, / Class 150 / Class 250 / or / Class 300 /, malleable iron with brass-to-iron seat, ground joint, and threaded ends. 5. Forged-Steel Flanges and Flanged Fittings shall be / ASME B16.5 / or / ASME B16.11 /, minimum Class 150, including bolts, nuts, and gaskets of the following
34、 material group, end connections, and facings: a. Material Group: 1.1. b. End Connections shall be threaded or butt welded to match pipe. c. Lapped Face is not permitted underground. d. Gasket Materials shall be ASME B16.20, metallic, flat, asbestos free, aluminum o-rings, and spiral-wound metal gas
35、kets. e. Bolts and Nuts shall be ASME B18.2.1, carbon steel aboveground and stainless steel underground. SPEC WRITER NOTE: Retain first subparagraph below for underground steel piping. Cathodic protection may be required in addition to protective coating. ASME B31.8. 6. Protective Coating for Underg
36、round Piping: SPEC WRITER NOTE: Select from the following: a. Factory-applied, three-layer coating of epoxy, adhesive, and polyethylene PE). b. Coal Tar Enamel Coating on exterior of pipe and fittings shall be cleaned, primed with Type B primer and coated with hot-applied coal-tar enamel with bonded
37、 layer of felt wrap in accordance with AWWA C203. Asbestos felt shall not be used; felt material shall be fibrous-glass mat as specified in Appendix Sec. A2.1 of AWWA C203. c. Joint cover kits shall include epoxy paint, adhesive, and heat-shrink PE sleeves. SPEC WRITER NOTE: Verify acceptability of
38、couplings in subparagraph below with authorities having jurisdiction before retaining. 7. Mechanical Couplings shall include: a. / Stainless-steel / Steel / flanges and tube with epoxy finish. b. Buna-nitrile seals. c. / Stainless-steel / Steel / bolts, washers, and nuts. Provided by IHSNot for Resa
39、leNo reproduction or networking permitted without license from IHS-,-,-10-11 33 51 00-8 d. Couplings shall be capable of joining PE pipe to PE pipe, steel pipe to PE pipe, or steel pipe to steel pipe. e. Steel body couplings installed underground on plastic pipe shall be factory equipped with anodes
40、. C. Corrugated, Stainless-Steel Tubing shall comply with ANSI/IAS LC 1 and ASTM A312, corrugated, Series 300 stainless steel. 1. Coating shall be PE with flame retardant with surface-burning characteristics determined by testing identical products according to ASTM E84 by a qualified testing agency
41、. Identify products with appropriate markings of applicable testing agency. a. Flame-Spread Index: / 25 / Insert value / or less. b. Smoke-Developed Index: / 50 / 450 / Insert value / or less. 2. Fittings shall be copper-alloy mechanical fittings with ends made to fit and listed for use with corruga
42、ted stainless steel tubing and capable of metal-to-metal seal without gaskets. Include brazing socket or threaded ends complying with ASME B1.20.1. 3. Striker Plates shall be steel, designed to protect tubing from penetrations. 4. Manifolds shall be malleable iron or steel with factory-applied prote
43、ctive coating. Threaded connections shall comply with ASME B1.20.1 for pipe inlet and corrugated tubing outlets. 5. Operating-Pressure Rating shall be 5 psi (34.5 kPa). SPEC WRITER NOTE: Verify acceptability of tubing in first paragraph below with authorities having jurisdiction before retaining. D.
44、 Aluminum Tubing shall comply with ASTM B210 and ASTM B241/B241M. 1. Aluminum Alloy 5456 is prohibited. 2. Protective coating shall be factory-applied and capable of resisting corrosion on tubing in contact with masonry, plaster, insulation, water, detergents, and sewerage. 3. Flare fittings shall c
45、omply with ASME B16.26 and SAE J513-199901 and the following: a. Copper-alloy fittings shall include metal-to-metal compression seal without gasket. b. Dryseal threads shall comply with ASME B1.20.3. E. PE Pipe: Pipe shall conform to / ANSI B31.8 / or / ASTM D2513 /. 1. Minimum wall thickness shall
46、conform to ASME B31.8. PE pipe is for underground use only. Polyethylene pipe shall be marked “GAS” and it Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-10-11 33 51 00-9 is not be used where gas pressures are above 100 psi (690 kPa) or with operati
47、ng temperatures below 20 deg F (7 deg C) or above 140 deg F (60 deg C). 2. PE Fittings shall be as per / ASTM D2513 / ASTM D2683, socket-fusion type / or / ASTM D3261, butt-fusion type /. 3. PE Transition Fittings shall be factory-fabricated fittings with PE pipe complying with ASTM D2513, SDR 11; a
48、nd steel pipe complying with ASTM A53, black steel, Schedule 40, Type E or S, Grade B. SPEC WRITER NOTE: Retain one of first two subparagraphs below for anode-less or transition service-line risers for PE pipe. 4. Polyethylene pipe joints shall be heat fused, either butt fusion or socket fusion. 5.
49、Anode-less Service-Line Risers shall be factory fabricated and leak tested. a. Underground portion shall be PE pipe complying with ASTM D2513. b. Casing shall be steel pipe complying with ASTM A53, Schedule 40, black steel, / Type E / or / Type S /, Grade B, with corrosion-protective coating covering. / Ven
