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Title: Effects Of Electric Faulting On Plastic Gas Pipe In Joint Trench
Author: William Ross
Source: American Gas Association 1975
Year Published: 1975
Abstract: Before getting into the details of P, G. and E.s test program on this subject it is perhaps best to give some historical data on our Companys decision to permit the installation of plastic pipe in joint trench. In 1965 our Company started using polyethylene plastic pipe on a regular basis. Its use was started mainly because of the complete plastic gas systems becoming available to the industry and the generally favorable economics from easier handling and installation over steel pipe. Usage was gradually increased via project type work until by 1970 we were using it on a fairly large scale. During this period, although steel pipe was used in joint trench application, plastic was not because of the possibility of plastic pipe temperatures exceeding 100 F from electric cable loading. The 100 F limit was placed upon plastic by the State of California General Order 112, and there was a similar restriction in the A.S.A. B31.8 Code. Subsequent Federal Safety Standards also adopted the same limitations.

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