Addressing The Shortcomings of a Sampling Strategy in CIPP Quality Assurance Programs


Addressing The Shortcomings of a Sampling Strategy in CIPP Quality Assurance Programs

Author:

Tony Araujo, Paragon Systems Testing, Concord, Ontario Canada

Abstract: Cured in place pipe has become ubiquitous as a rehabilitation process for underground infrastructure. While the technology has become widely accepted as an effective rehabilitation method, the strategies for ensuring the quality of an installation are still eveolving.

The two primary metrics for determining whether a CIPP installation will be effective are the short term flexural modulus and the installed thickness. Other industry research has shown that even with a rigorous QA process in place, short term flexural modulus and installed thickness can exhibit significant variability, exposing the Owner to the risk that non-conforming liners are being installed.

This paper identifies the shortcomings of this approach and describes the experience of the City of Toronto in implementing a comprehensive quality control approach to CIPP installations.

This paper describes the identifies the shortcomings of the traditional QC sampling approach used in many CIPP projects and demonstrates the innovative QA/QC process used by Toronto Water to reduce the risk that non-conforming CIPP liners are installed in their sewer rehabilitation program.

Publication Date: 2019

Presented at:
NASTT’s 2019 No-Dig Show Chicago, Illinois
March 17-21, 2019 | Paper Number: TM1-T5-04


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