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Open Access Long-Term Cured-In-Place Pipe (CIPP) Performance and its Design Implications

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Cured-in-place pipe (CIPP) lining is an attractive alternative for rehabilitating pipes without the need for digging. However, the nature of CIPP is, in essence, a pipe manufactured below ground. And unlike pre-fabricated materials that have been through a series of long-term testing, below ground "manufacturing" introduces a host of variables (variable installation conditions, different installation methodologies, etc.) in the short and long-term reliability of CIPP as a pipe material. Contractors, engineers, and utility owners have generally accepted that CIPP has a 50-year design life and most CIPP designs assume that the long-term properties of the liners will retain 50% of their initial value. This paper addresses the various ways to test and anticipate the long-term performance of CIPP liners and verify the true design life. The paper also presents options available to Owners and Engineers if test results are not as expected.
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Keywords: ASTM D2990; CIPP; CIPP DESIGN; CIPP DESIGN LIFE; CURED-IN-PLACE PIPE; LONG-TERM TESTING; PIPE REHABILITATION

Document Type: Research Article

Publication date: 2007-12-01

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