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A pilot study for retrospective evaluation of cured-in-place pipe (CIPP) rehabilitation of municipal gravity sewers
Highlights ► A very rare in-depth evaluation of CIPP liners after years of service. ► Evaluation of the usefulness of various types of testing for tracking the deterioration of CIPP liners in-service. ► Preliminary observations on the potential life-cycle for CIPP liners. ► The study is intended as a pilot study for more extensive evaluations of CIPP liners and other rehabilitation technologies.
Abstract Pipe rehabilitation and trenchless pipe replacement technologies have seen a steadily increasing use over the past 30–40years. Despite the massive public investment in the rehabilitation of the US water and wastewater infrastructure, there has been little formal and quantitative evaluation of whether rehabilitation technologies are performing as expected and whether rehabilitation is indeed cost-effective compared to replacement. This paper describes the results of a pilot project for the retrospective evaluation of cured-in-place pipe (CIPP) liners. The pilot testing used CIPP samples from both large and small diameter sewers in two cities: Denver, CO and Columbus, OH. Testing on the liners included: thickness, annular gap, ovality, density, specific gravity, porosity, flexural strength, flexural modulus, tensile strength, tensile modulus, surface hardness, glass transition temperature, and Raman spectroscopy. In addition, environmental data was gathered as appropriate to each retrieval process including: external soil conditions and pH, and internal waste stream pH. Summaries of the test results and a discussion of their implications for CIPP performance are provided in this paper. All of the samples retrieved from the four locations involved in the pilot study testing were in excellent condition after being in use for 25years, 23years, 21years and 5years, respectively. Overall, it is concluded that there is no reason to anticipate that the liners evaluated in this pilot study will not last for their intended lifetime of 50years and perhaps well beyond.
A pilot study for retrospective evaluation of cured-in-place pipe (CIPP) rehabilitation of municipal gravity sewers
Highlights ► A very rare in-depth evaluation of CIPP liners after years of service. ► Evaluation of the usefulness of various types of testing for tracking the deterioration of CIPP liners in-service. ► Preliminary observations on the potential life-cycle for CIPP liners. ► The study is intended as a pilot study for more extensive evaluations of CIPP liners and other rehabilitation technologies.
Abstract Pipe rehabilitation and trenchless pipe replacement technologies have seen a steadily increasing use over the past 30–40years. Despite the massive public investment in the rehabilitation of the US water and wastewater infrastructure, there has been little formal and quantitative evaluation of whether rehabilitation technologies are performing as expected and whether rehabilitation is indeed cost-effective compared to replacement. This paper describes the results of a pilot project for the retrospective evaluation of cured-in-place pipe (CIPP) liners. The pilot testing used CIPP samples from both large and small diameter sewers in two cities: Denver, CO and Columbus, OH. Testing on the liners included: thickness, annular gap, ovality, density, specific gravity, porosity, flexural strength, flexural modulus, tensile strength, tensile modulus, surface hardness, glass transition temperature, and Raman spectroscopy. In addition, environmental data was gathered as appropriate to each retrieval process including: external soil conditions and pH, and internal waste stream pH. Summaries of the test results and a discussion of their implications for CIPP performance are provided in this paper. All of the samples retrieved from the four locations involved in the pilot study testing were in excellent condition after being in use for 25years, 23years, 21years and 5years, respectively. Overall, it is concluded that there is no reason to anticipate that the liners evaluated in this pilot study will not last for their intended lifetime of 50years and perhaps well beyond.
A pilot study for retrospective evaluation of cured-in-place pipe (CIPP) rehabilitation of municipal gravity sewers
Allouche, E. (author) / Alam, S. (author) / Simicevic, J. (author) / Sterling, R. (author) / Condit, W. (author) / Matthews, J. (author) / Selvakumar, A. (author)
Tunnelling and Underground Space Technology ; 39 ; 82-93
2012-01-01
12 pages
Article (Journal)
Electronic Resource
English
CIPP , Rehabilitation , Sewer , Testing , Evaluation , Deterioration , QA/QC , Assessment
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