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Title: Plastic Pipe Design Equation Update
Author: Donald L. Schrantz
Source: American Gas Association 1998
Year Published: 1998
Abstract: The gas distribution industry should applaud the plastic pipe industry for the improvements in plastic materials over the last thirty plus years. The improved performance of the plastic material has reduced failures and leaks in gas distribution piping systems around the world. This has enabled the A.G.A. Plastic Materials Committee (PMC) to write petitions to the Department of Transportation (DOT) to amend Title 49 Code of Federal Regulations (CFR) to increase the allowable operating pressure for plastic pipe feeder systems to 125 psig, in Class 1 and 2 areas, and less than 12-inches for PE2406 and PE3406 polyethylene material as specified by ASTM D 2513 and Polyamide material pipe. In addition, the PMC is also drafting a petition to DOT to increase the design factor from 0.32(1) to 0.40. This paper will discuss the proposal to change the design factor used in the plastic pipe design equation for computing the design pressure for new plastic piping installations from the current value of 0.32 to 0.40 in section 192.121.

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