(a) This Standard covers manually operated thermo-plastic valves in nominal valve sizes % through 12. These valves are intended for use below ground in thermoplas-tic fuel gas distribution mains and service lines. The maximum operating pressure (MOP) at which such dis- tribution piping systems may be operated is in accor-dance with the Code of Federal Regulations (CFR) Title 49, Part 192, Transportation of Natural and Other Gas by Pipeline; Minimum Safety Standards, for temper-ature ranges of- 20°F to 140°F ( -29°C to 60°C).
(6) This Standard sets qualfication requirements for each basic valve design as a necessary condition for demonstrating conformance to this Standard.
