Historically, the most common renewal method has been to replace the pipeline using open-cut construction. A lack of investment in the aging pressure pipe infrastructure, coupled with growing congestion above and below ground, has accelerated development in the trenchless rehabilitation industry. With an array of proven trenchless rehabilitation technologies, how does a utility owner or engineer determine the appropriate technology? This presentation will briefly review the common and emerging trenchless technologies for pressurized pipeline rehabilitation. Then, it will provide a basic framework that can be used to evaluate and select an appropriate solution. We’ll review the concept of structural classification of pressure pipe linings as defined in American Water Works Association (AWWA) publications, which is a critical component to selecting an appropriate trenchless technology. We’ll also review a few case studies that demonstrate how the basic framework was followed to select a trenchless technology solution.

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Rick Baxter

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