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Title: Guidelines And Procedures For Assessing Service Performance Of Polyethylene Modified Slip Liners
Author: Chris J. Kuhlmang. Graham Chell, Carl H. Popelartimothy S. Rennick, Douglas A. Mckee, Timothy S. Grant
Source: American Gas Association 1998
Year Published: 1998
Abstract: Service guidelines and assessment procedures are presented to assist gas company engineers in establishing the fitness-for-service of polyethylene (PE) modified slip liners (MSL) that are used for gas pipe rehabilitation. The two dominant failure modes of PE gas pipes (neglecting third-party damage) are ductile rupture and brittle slow crack growth (SCG). These modes are the focus of this investigation for pressurized PE liners exposed by defects and cutouts in rehabilitated metal host pipes. Although liners are designed as stand-alone pipes, field conditions may render this design approach nonconservative because stresses in exposed PE liners can be greater than those predicted for stand-alone pipes. Therefore, additional fitness-for-service procedures are described in this paper that augment the plastic pipe design equation.

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