Page 313 - Trenchless Technology Piping Installation and Inspection

CHAPTER 7

Construction and

Inspection for

Cured-in-Place Pipe

7.1 Overview of the CIPP Technology

7.1.1 Background
Cured-in-place pipe (CIPP) installation is one of the most widely
used methods of trenchless pipeline renewal for both structural and
non-structural purposes, and can be used for water, sewer (sanitary,
storm, culvert), oil, and gas applications. The CIPP technology is used
to renew deteriorated, leaking, and outdated pipelines for a new
design life of 50 years.
The CIPP method involves a liquid thermoset resin-saturated
material that is inserted into the existing pipeline by hydrostatic or
air inversion, or mechanically pulled with a winch, a cable, and infla-
tion. The material is heat-cured in place resulting in a CIPP product.
Insituform Technologies introduced CIPP in the United Kingdom in
1971 and entered the United States market in 1976. Currently CIPP
technology is offered by a large number of companies.
As for any other pipeline renewal method, CIPP design and
installation is based on factors, such as the existing pipe condition, its
defects, its applications (type of fluid and its properties) and its envi-
ronment, nature of problem or problems involved, and future use of
the pipeline. A existing pipeline system can exhibit a number of dif-
ferent defects. The defect can be structural in nature, operational or
maintenance related, built into the system during construction, or
can be a mix of different types of problems.

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