The Office of Pipeline Safety (OPS) is considering several amendmento to Part 192 concerning qualifications for uso of plastic pipe: Amendments to Appendices A and B would incorporate by reference the 1970 and 1971 editions of the American Society for Testing Materials (ASTM) Specification D2513, "Standard Specification for Thermoplastic Gas Pressure Pipe, Tubing, and Fittings." An amendment to § 192.123(c) would adopt a standard dimension ratio (SDR) of 21 in determining minimum
wall thickness for plastic pipe. An amendment to § 192.59 would permit the use of special sizes of plastic pipe where pipe of a diameter included in a listed specification is impractical to use. Finally, a further amendment to § 192.59 would require, as a qualification for use, that plastic pipe manufactured after the effective date of the amendment be manufactured in accordance with the latest listed edition of a listed specification. Listed specifications are those in Section I of Appendix B to Part 192.