335115_NATURAL-GAS_LIQUID_PETROLEUM_GAS_DISTRIBUTION_-_AMENDMENT_3.pdf

NASA Steam Distribution Replacement M5058

NATURAL-GAS LIQUID PETROLEUM GAS DISTRIBUTION 335115 – 1

AMENDMENT 3 – 6/12/17

SECTION 335115 - NATURAL-GAS / LIQUID PETROLEUM GAS DISTRIBUTION

PART 1 - GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN GAS ASSOCIATION (AGA)

AMERICAN PETROLEUM INSTITUTE (API)

API Spec 5L (2007; Errata 2009; Addenda 1 2009; Addenda 2 2010;

Addendum 2 2011; Addendum 3 2011; 44th Ed) Specification for Line Pipe

API Spec 6D (2008; Errata 1 2008; Errata 2 2008; Errata 3 2009;

Addendum 1 2009; Errata 4 2010; Errata 5 2010; Errata 6 2011; Addendum 2 2011; Addendum 3 2012) Specification for Pipeline Valves

AMERICAN WATER WORKS ASSOCIATION (AWWA)

AWWA C203 (2008) Coal-Tar Protective Coatings and Linings for Steel

Water Pipelines - Enamel and Tape - Hot-Applied

ASME INTERNATIONAL (ASME)

ASME B16.40 (2008) Manually Operated Thermoplastic Gas Shutoffs and Valves in Gas Distribution Systems

ASME B31.8 (2010; Supplement 2010) Gas Transmission and Distribution

Piping Systems

ASTM INTERNATIONAL (ASTM)

ASTM D2513 (2012a) Thermoplastic Gas Pressure Pipe, Tubing, and Fittings

ASTM D2683 (2010) Standard Specification for Socket-Type Polyethylene

Fittings for Outside Diameter-Controlled Polyethylene Pipe and Tubing

ASTM D3261 (2010a) Standard Specification for Butt Heat Fusion

Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing

ASTM D3308 (2012) PTFE Resin Skived Tape

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ASTM D3350 (2012) Polyethylene Plastics Pipe and Fittings Materials

ASTM F2786 (2010) Standard Practice for Field Leak Testing of Polyethylene (PE) Pressure Piping Systems Using Gaseous Media Under Pressure (Pneumatic Leak Testing)

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 54 (2012) National Fuel Gas Code

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

49 CFR 192 Transportation of Natural and Other Gas by Pipeline:

Minimum Federal Safety Standards

UNDERWRITERS LABORATORIES (UL)

UL FLAMMABLE & COMBUSTIBLE (2012) Flammable and Combustible Liquids and Gases Equipment Directory

1.2 SYSTEM DESCRIPTION

The gas distribution system includes natural gas piping and appurtenances from point of connection with existing system, as indicated, to a point approximately 5 feet from the facilities.

1.3 SUBMITTALS

A. Shop Drawings

Other than road bores identified as cased bores, the Contractor has the option to install the gas lines by open cut construction, directional drilling construction, or a combination of both. Road crossings that require a cased bore, shall be installed by jack and bore or directional bore. Contractor shall submit a detailed schedule and a shop drawing indicating each area to be open cut, directionally drilled, and jack and bored, and an Erosion Control Plan suitable for the methodology chosen. Indicate bore and receiving pits.

B. Connection and Abandonment Plan

Submit written notification of the method and schedule for making connections to existing gas lines, to the COR at least 10 days in advance. Include gas line tie in, hot taps, abandonment/removal or demolition, purging, and plugging as applicable in conformance with ASME B31.8. Include in submittal connections to existing lines. The number of existing system outages are to be minimized.

C. Product Data for Pipe, Fittings, and Associated Materials

D. Test Reports

Pressure and Leak Tests

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E. Certificates

Welding Procedure Specifications, Welding Procedure Qualification Records, and Welder’s Qualification Reports

F. As-Built Drawings

1.4 QUALITY ASSURANCE

A. Qualifications

1. Jointing of Polyethylene Piping

a. Join piping by performance qualified PE joiners, qualified by a person who has been trained and certified by the manufacturer of the pipe, using manufacturer's pre-qualified joining procedures in accordance with AGA XR0603. Welders training, qualifications and procedures, includes use of equipment, explanation of the procedure, and successfully making joints which pass tests specified in AGA

XR0603.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Delivery and Storage: Inspect materials delivered to the site for damage, and store with a minimum of handling. Store materials on site in enclosures or under protective coverings.

Store plastic piping under cover out of direct sunlight. Do not store materials directly on the ground. Keep inside of pipes and fittings free of dirt and debris.

B. Handling: Handle pipe and components carefully to ensure a sound, undamaged condition.

Take particular care not to damage pipe coating. Repair damaged coatings to original finish.

Do not place pipe or material of any kind inside another pipe or fitting after the coating has been applied, except as specified in paragraph INSTALLATION. Handle plastic pipe in conformance with AGA XR0603.

PART 2 - PRODUCTS

2.1 PIPE, FITTINGS, AND ASSOCIATED MATERIALS

A. Provide materials and equipment which are the standard products of a manufacturer regularly engaged in the manufacture of the products that have been in satisfactory use for at least 2 years prior to bid opening. Asbestos or products containing asbestos are not allowed. Mark all valves, flanges, and fittings in accordance with MSS SP-25.

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AMENDMENT 3 – 6/12/17

B. Polyethylene Pipe, Tubing, Fittings and Joints:

Design Pressure at 23 degrees C 73 degrees F

SDR S = 8.62 MPa 1,250 psi S = 11 MPa 1,600 psi

11 550 kPa80 psig 690 MPa100 psig

Provide polyethylene pipe, tubing, fittings and joints conforming to ASTM D3350 and ASTM D2513, pipe designations PE 2406/PE 2708 (MDPE) and PE 3408, rated SDR 11 or less, as specified in ASME B31.8. Mark pipe sections as required by ASTM D2513. Provide butt fittings conforming to ASTM D3261 and socket fittings conforming to ASTM D2683. Match fittings to the service rating of the pipe.

1. Gas Transition Fittings: Provide manufactured steel gas transition fittings approved for jointing steel and polyethylene pipe, conforming to AGA XR0603 requirements for transition fittings.

2.2 VALVES

Provide valves suitable for shutoff or isolation service and conforming to the following:

A. Polyethylene Valves: Provide polyethylene valves conforming to ASME B16.40.

Polyethylene valves, in sizes 1/2 inch to 6 inches, may be used with polyethylene distribution and service lines, in lieu of steel valves, for underground installation only.

2.3 PRESSURE REGULATORS

Provide ferrous bodied regulators with backflow protection, designed to meet the pressure, load and other service conditions.

PART 3 - EXECUTION

3.1 EXAMINATION

After becoming familiar with all details of the work, verify all dimensions in the field, and advise the COR of any discrepancy before performing the work.

3.2 EXCAVATION AND BACKFILLING

Earthwork is as specified in Section 312000 “Earth Moving”.

3.3 GAS MAINS

Provide polyethylene pipe for gas mains. Do not install polyethylene mains aboveground.

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AMENDMENT 3 – 6/12/17

3.4 SERVICE LINES AND EMERGENCY GAS SUPPLY CONNECTION

A. General: Construct service lines of materials specified for gas mains and extend from a gas main to and including the point of delivery within 5 feet of the building. The point of delivery is the service regulator. Connect the service lines to the gas mains as indicated. Where indicated, provide service line with an isolation valve of the same size as the service line.

Make the service lines as short and as straight as practicable between the point of delivery and the gas main, without bends or lateral curves unless necessary to avoid obstructions or otherwise permitted. Lay service lines with as few joints as practicable using standard lengths of pipe, use shorter lengths only for closures. Do not install polyethylene service lines aboveground.

3.5 WORKMANSHIP AND DEFECTS

Make pipe, tubing, and fittings clear and free of cutting burrs and defects in structure or threading, and thoroughly brushed and blown free of chips and scale. Do not repair, but replace defective pipe, tubing, or fittings.

3.6 INSTALLATION

Install gas distribution system and equipment in conformance with the manufacturer's recommendations and applicable sections of ASME B31.8, AGA XR0603 and 49 CFR 192. Perform abandonment of existing gas piping in accordance with ASME B31.8. Cut the pipe without damaging the pipe; unless otherwise authorized, use an approved type of mechanical cutter. Use wheel cutters where practicable. Cut plastic pipe in accordance with AGA XR0603. Design valve installation in plastic pipe to protect the plastic pipe against excessive torsional or shearing loads when the valve is operated and from other stresses which may be exerted through the valve or valve box. Install gas piping, appliances, and equipment in accordance with NFPA 54 and in compliance with the CSST manufacturer's installation instructions. Install distribution piping in accordance with ASME B31.8.

A. Installing Pipe Underground: Provide mains with 30 inch minimum cover; service lines with 18 inch minimum cover; and place both mains and service lines on firmly compacted select material for the full length. Where indicated, encase, bridge, or design the main to withstand any anticipated external loads as specified in ASME B31.8. Provide standard weight black steel pipe encasement material with a protective coating as specified. Separate the pipe from the casing by insulating spacers and seal the ends with casing bushings. Excavate the trench below pipe grade, bed with bank sand, and compact to provide full-length bearing. Laying pipe on blocks to produce uniform grade is not permitted. Ensure that the pipe is clean inside before it is lowered into the trench and keep free of water, soil, and all other foreign matter that might damage or obstruct the operation of the valves, regulators, meters, or other equipment. When work is not in progress, securely close open ends of pipe or fittings with expandable plugs or other suitable means. Minor changes in line or gradient of pipe that can be accomplished through the natural flexibility of the pipe material without producing permanent deformation and without overstressing joints may be made when approved. Make changes in line or gradient that exceed the limitations specified with fittings. When cathodic protection is furnished, provide electrically insulated joints or flanges. When polyethylene piping is installed underground, place foil backed magnetic tape above the pipe in accordance with NFPA 54 to permit locating with a magnetic detector. After laying of pipe and testing, backfill the trench in accordance with Section 312000 “Earth Moving”.

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3.7 PIPE JOINTS

Install pipe joints to effectively sustain the longitudinal pullout forces caused by the contraction of piping or superimposed loads.

A. Polyethylene Pipe Jointing Procedures: Use jointing procedures conforming to AGA XR0603.

Avoid making indiscriminate heat fusion joining of plastic pipe or fittings made from different polyethylene resins by classification or by manufacturer if other alternative joining procedures are available. If heat fusion joining of dissimilar polyethylene is required, special procedures are required. Test the method of heat fusion joining dissimilar polyethylene resins in accordance with paragraph TESTS, subparagraph Destructive Tests of Plastic Pipe Joints.

B. Connections Between Metallic and Plastic Piping: Only make metallic to plastic connections outside, underground, and with approved transition fittings.

3.8 VALVE BOXES

Provide valve boxes of cast iron not less than 3/16 inch thick at each underground valve except where concrete or other type of housing is indicated. Provide valve boxes with locking covers that require a special wrench for removal, and furnish the correctly marked wrench for each box. Cast the word "gas" in the box cover. Protect the valve box by a suitable concrete slab 2 feet square and set flush with the surface. Make the boxes adjustable extension type with screw or slide-type adjustments.

Separately support valve boxes to not rest on the pipe, so that no traffic loads can be transmitted to the pipe.

3.9 CONNECTIONS TO EXISTING LINES

Make connections between new work and existing gas lines, where required, in accordance with ASME B31.8, using proper fittings to suit the actual conditions. When connections are made by tapping into a gas main, provide the same size connecting fittings as the pipe being connected.

A. Refer to Section 010590 “Special Conditions” for outages.

B. The Army Directorate of Public Works (DPW) shall perform all connections to existing natural gas mains through its general contracting.

C. The Contractor shall be responsible for performing the excavation at the location of the point of connection as well as providing all materials required for connections to existing mains.

Required materials may include, without limitation, all piping, valves, fittings and other piping appurtenances necessary to complete the connection to the existing gas main. All materials provided shall be compatible with M. T. Deason natural gas equipment.

D. The Contractor shall be responsible for contacting DPW and its general contractor representative a minimum of 14 days prior to the planned excavation and connection to an existing main. The Contractor shall be responsible for initiating a work order for planned connections to existing gas mains by contacting the DPW general contractor at (256) 876- 2601.

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E. The DPW general contractor shall be present during any excavation within 10 feet of an existing natural gas main. The Contractor shall contact Donnie Bearden at Wolf Creek Federal Services, Inc. at (256) 876-2163 (office) or (256) 783-1003 (cell), or Steve Cosby with Wolf Creek Federal Services, Inc. at (256) 876-2163 (office) or (256) 425-8205 (cell), a minimum of 2 days in advance of any planned excavation adjacent to an existing natural gas main.

3.10 TESTS

A. Destructive Tests of Plastic Pipe Joints: Prior to making polyethylene heat fusion joints, make a joint of each size and type to be installed that day by each person performing joining of plastic pipe that day and destructively test. Cut at least 3 longitudinal straps from each joint.

Visually examine each strap for voids or discontinuities on the cut surfaces of the joint area, deformations by bending, torque, or impact. If failure occurs, it must not initiate in the joint area. If a joint fails the visual or deformation test, the qualified joiner who made that joint is not allowed to make further field joints in plastic pipe on this job until that joiner has been retrained and re-qualified. Record the results of the destructive tests including the date and time of the tests, size and type of the joints, ambient conditions, fusion iron temperature and names of inspectors and joiners.

B. Pressure and Leak Tests: Test the system of gas mains and service lines after construction and before being placed in service, using air as the test medium. Follow all testing recommendations and safety precautions as recommended by the piping manufacturer's specifications, NFPA 54 and 49 CFR 192. Submit data in booklet form from all pressure tests of the distribution system. Perform testing for polyethylene (PE) piping in accordance with ASTM F2786. The normal operating pressure for the system is 50 psi. The test pressure is 75 psi.

1. Prior to testing the system, blow-out, clean, and clear the interior of all foreign materials.

Remove all meters, regulators, and controls before blowing out and cleaning, and reinstall after clearing of all foreign materials.

2. Perform testing of gas mains and service lines with due regard for the safety of employees and the public during the test. Keep persons not working on the test operations out of the testing area while testing is proceeding. Perform the test on the system as a whole or on sections that can be isolated.

3. Test joints in sections prior to backfilling when trenches will be backfilled before the completion of other pipeline sections. Continue the test for at least 24 hours from the time of the initial readings to the final readings of pressure and temperature. Do not take the initial test readings of the instrument for at least 1 hour after the pipe has been subjected to the full test pressure. Do not take initial or final readings at times of rapid changes in atmospheric conditions, and temperatures are representative of the actual trench conditions. No indication of reduction of pressure is allowed during the test after corrections have been made for changes in atmospheric conditions in conformity with the relationship T(1)P(2)=T(2)P(1), in which T and P denote absolute temperature and pressure, respectively, and the numbers denote initial and final readings.

4. During the test, completely isolate the entire system from all compressors and other sources of air pressure. Test each joint by means of soap and water or an equivalent

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nonflammable solution prior to backfilling or concealing any work. Secure approval of testing instruments from the COR. Furnish all labor, materials and equipment for conducting the tests subject to inspection at all times during the tests. Maintain safety precautions for air pressure testing at all times during the tests.

3.11 AS-BUILT DRAWINGS

A. Submit an electronic copy and three hard copies of the as-built drawings to the Contracting Officer within five days after completing the installation. Include in the record drawings a plan, profile, and all information recorded during the progress of the work. Provide GPS Coordinates of the installed gas lines.

END OF SECTION 335115