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THE MAGAZINE FOR THE DRAINAGE, WATER & WASTEWATER INDUSTRIES


MAIN FEATURE


When I first started out in the industry nearly 30 years ago, Cured-in-place technology (CIPP) was still new, and site and skill practices were still in their infancy. QA/QC on site, etc., was hit and miss, specifically with small diameter pipes. Even though the technology has revolutionized the field of trenchless rehabilitation, providing an efficient and effective solution for repairing aging infrastructure mainly in sewer lines, but more recently in pressure applications and also drinking water. Back when I started, CIPP was really only used in gravity applications. Curing, using heat, steam, or UV light now was back in the day limited to ambient sure or hot water mainly.


One of the primary skills challenges in working with cured-in- place technology is the need for a thorough understanding of material properties and behaviors. The resin used in CIP must be carefully selected based on the specific conditions of the project, including the type of substrate, environmental and ground conditions, and the expected load on the rehabilitated pipe. Professionals must be well-versed in the chemical and physical characteristics of these materials, as improper selection can lead to failures, such as delamination or insufficient curing. A lot of guesswork was used in the early


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December 2024 |


9


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