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.

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

Document Type: Research article

DOI: http://dx.doi.org/10.2175/193317707X269636

Publication date: 2007-12-01

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Water Practice™ publishes peer-reviewed articles and reports focusing on applied water studies. Topics include monitoring, facility operations and maintenance, management, policy, and other issues of interest and concern to water practitioners. The Journal publishes on a monthly to bi-monthly basis and is available online only.
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