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Retrospective Evaluation of Cured-in-Place Pipe Technology for Municipal Gravity Sewer Rehabilitation
Citation:
Allouche, E., L. Wang, R. Sterling, AND A. SELVAKUMAR. Retrospective Evaluation of Cured-in-Place Pipe Technology for Municipal Gravity Sewer Rehabilitation. Presented at NASTT 2010 No-Dig Show, Chicago, IL, May 02 - 07, 2010.
Impact/Purpose:
To inform the public.
Description:
One of the top research needs identified at the September 2008 U.S. EPA International Technology Forum on Rehabilitation of Water and Wastewater Systems is to undertake a broad and quantitative retrospective evaluation of the performance of previously rehabilitated systems. Currently, the most challenging issue in asset management is how to predict remaining asset life and how long rehabilitation techniques may extend that life. Municipalities are seeking hard data on the current conditions of previously installed systems to help determine whether to rehabilitate or replace aging pipes and which rehabilitation techniques to choose. This paper presents the technical approach developed for a retrospective evaluation of CIP liners for gravity sewers. Utilities in North America that have already engaged in similar efforts are being identified and interviewed. Their experience and input are considered when developing protocols for the retrospective evaluation. The evaluation consists of interviews of utility employees who are familiar with the rehabilitation system installation, quantification of the system’s history, closed circuit television (CCTV) inspection of the system, and forensic examinations of in situ liners and/or samples retrieved. The developed protocols will be demonstrated at two utilities as case studies where field and laboratory data on the installed systems will be collected and evaluated. Information on the cost and time taken for the data collection will also be documented. A prototype database will be developed and populated with the case study results
URLs/Downloads:
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