The following minimum standards apply to natural gas system extensions within the city:
(A) Mains:
(1) Minimum diameter: two inches.
(2) Depth: three feet of cover below final grade.
(3) Material type: polyethylene conforming to the requirements of the ASTM D-2513 (current edition) specification, Thermoplastic Gas Pressure Pipe, Tubing and Fittings. Standard dimension ratio: SDR 17, minimum.
(4) Pressure test: mains and services, if connected: 90 P.S.I.G. for one-hour minimum.
(5) Trace wire: 12 gauge insulated conductive copper wire securely bonded together at all joints and pipe intersections and accessible at all valve boxes and services.
(6) Heat fusion joints: all persons making heat fusion joints must be currently certified to make the joint. A copy of the certificate(s) must be furnished to the city.
(B) Valves:
(1) Locations: must conform to city’s sectionalizing valve plan.
(2) Material: polyethylene valve stub ends must be compatible with the pipe specified above including the standard dimension ratios (SDR).
(3) Type: Rockwell pulyvalve ball valves.
(C) Fitting material: polyethylene conforming to the requirements of ASTM D-2683 specification Socket-Type Polyethylene Fittings for Outside Diameter Controlled Polyethylene Pipe or ASTM D-3261, Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing.
(Ord. 328, passed 11-20-84; Am. Ord. 108-95, passed 2-21-95)