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Retrospective Study of In-Service CIPP Liners
Citation:
Allouche, E., R. Sterling, A. SELVAKUMAR, J. Matthews, AND W. Condit. Retrospective Study of In-Service CIPP Liners. Presented at Underground Construction Technology Trenchless Technical Symposium, San Antonio, TX, January 24 - 26, 2012.
Impact/Purpose:
To inform the public.
Description:
Cured-in-place pipe (CIPP) has been used for rehabilitation of deteriorating wastewater pipes for nearly 30 years in the US with much success. However, little quantitative data is available regarding the performance of these liners, to verify their estimated design life of 50 years. With more than 70 million feet of CIPP liners installed worldwide, utilities and municipalities seek verification that these rehabilitation systems are performing up to their design life. As part of the U.S. Environmental Protection Agency (EPA)’s Aging Water Infrastructure Research Program, one of the key areas of research being pursued, in collaboration with wastewater utilities, is a CIPP retrospective study. The purpose of this study is to (1) determine the engineering properties of aged, in-service, CIPP liners and compare these with original design values; (2) identify and provide insight into degradation mechanisms and deterioration rates of CIPP liners; and (3) attempt to provide a more accurate estimate of the service life of CIPP liners. This session will discuss the development of a retrospective evaluation protocol and the results of the array of tests that were performed on five total samples exhumed from field sites in Denver, Colorado and Columbus, Ohio. This project represents the first known attempt in the U.S. to study the properties of CIPP liners which have been operating under field conditions for nearly 30 years.