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Title: Correlating Aldyl A And Century Pe Pipe Rate Process Method Projections With Actual Field Performance
Author: Gene Palermo
Source: American Gas Association 2004
Year Published: 2004
Abstract: The recent Department of Transportation Advisory Bulletin, Notification of the Susceptibility to Premature Brittle-Like Cracking of Older Plastic Pipe cited lower ductile inner wall Aldyl A and Century polyethylene (PE) pipe as two materials that were known to be susceptible to brittle-like cracking or slit failures. Many miles of these materials are still in service in the United States. The key question is - what is the projected life of these PE pipes still in the ground? The Rate Process Method (RPM) is used to project performance (lifetime) of PE materials at their in-ground temperatures and pressures based on both internal pressure as the primary load and secondary loads such as rock impingement and squeeze-off. This paper will provide a discussion on the Rate Process Method. RPM involves exhuming samples of pipe from service and subjecting them to laboratory elevated temperature sustained pressure testing that results in slit failures.

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