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

Authors: Lee, Robert K.; Ferry, Steve

Source: Water Practice, Volume 1, Number 6, December 2007 , pp. 1-12(12)

Publisher: Water Environment Federation

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Abstract:

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.

Keywords: CURED-IN-PLACE PIPE; CIPP; LONG-TERM TESTING; ASTM D2990; CIPP DESIGN; CIPP DESIGN LIFE; PIPE REHABILITATION

Document Type: Research article

DOI: 10.2175/193317707X269636

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