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CP452  Operation of CIPP Rehabilitated Pipes Beyond the Design Life Pipeline Materials
Project Appreciation and Objectives

Cured in Place Pipe (CIPP) linings have an extrapolated design life of 50 years; this is based on 14 month long term testing. Companies need to be able to plan, with confidence, how aging CIPP linings should be dealt with over the coming regulatory planning periods.

Universally replacing CIPP when it reaches its design life would be costly; second generation rehabilitation of a pipe is also expensive and has issues associated with reduced hydraulic performance.

However, there is a view that it would be safe to extend the asset life of the CIPP beyond its design life but, due to the varying nature and location conditions of CIPP, it would be a risk to assume this for all CIPP. Companies could be operating with assets beyond their design life, with no justification that they would continue to perform, and no real understanding of how long they could do this.

The main objective of this project is to develop performance indicators for a 'CIPP health-check' and investigate whether it is possible to determine if the asset life of a CIPP lining can be extended beyond its design life.

Benefits to Clients

  • Inform participants whether it could be possible to justify operating rehabilitated pipe past its design life, avoiding unnecessary costs.
  • Understanding the true asset life of CIPP will aid long term planning of rehabilitation of sewer network and provide an adjustment to whole life costing.

Work Programme

A 'CIPP health-check' will be developed by reviewing existing information, details of available condition inspection and testing techniques (both destructive and non-destructive) and developing a specification of what lining parameters should be and can be collected based on these findings and WRc's experience of CIPP technologies.

Project OUtput

  • A report detailing the lining performance indicators that need to be collected and what inspection and testing techniques are available.
  • A methodology and test specification for carrying out a 'CIPP health-check'.

Related Work

  • WRc ApprovedTM scheme - Assessment of various CIPP technologies - 1990's to present.
  • Pipeline Failure Investigaton and Condition Assessment - 2002.
  • Sewerage Risk Management (SRM) - 2008 - on-going.
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