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Final Program


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Collections: Leadership

Advanced Construction Lessons Learned: Large Diameter Pressure CIPP Lining

Thursday, April 9, 2026
10:15 AM - 11:05 AM PT
Location: B 2
Presentation Description: For many industry professionals, navigating the post-installation acceptance criteria for large diameter pressure cured-in-place-pipe (CIPP) lining applications can be unchartered territory. As the technical envelope of the technology for pressure systems expands, including longer runs and larger diameters, the industry standards and guidelines that address acceptance criteria haven’t quite kept pace. One example of this can be found in ASTM D638, Standard Test Methods for Tensile Properties of Plastics, where the associated limitation on thickness for sample testing leaves a hole in how to test thicker, reinforced samples.

This presentation will highlight the various nuances that arose when constructing a recent 42-inch pressure main CIPP rehabilitation project. Details will include how the project team navigated the issues that arose during construction by using engineering best practices, in consultation with several different industry standards and guidelines (e.g., ASTMs, NASSCO, NASTT, AWWA, etc), along with cooperative meetings with the construction stakeholders.

Specific topics to be discussed will include the following:

• Visual appearance of the final CIPP product versus actual conditions, including the expectations of the owner and engineer
• Basis of construction acceptance for fins and wrinkles, in conformance with available governing industry standards, against the limitations of those standards
• Curing report inconsistencies against the wet out log reports
• Lab testing protocol variations against the contract requirements

Learning Objectives:

  • • Upon completion, participants will better understand the various parameters and criteria involved in designing Glass Fiber Reinforced Cured-in-Place Pipe (GFR CIPP).
  • • Upon completion, participants will be able to understand the limitations in acceptance testing standards for large diameter pressure pipe applications.
  • • Upon completion, participants will have realistic expectations on the visual appearance of installed glass reinforced CIPP and understand the need for application-specific standards and methods.