Background Cured-in-place-pipe (CIPP) is the most popular water pipe repair method used in the U.S. for sanitary sewer, storm sewer, and is increasingly being used for drinking water pipe repairs. Today, approximately 50% of all damaged pipes are being repaired using CIPP technology. The CIPP procedure involves the chemical manufacture of a new plastic pipe called a CIPP inside a damaged water pipe. Before CIPP installation, workers precut and lay-up the felt and fiberglass liner and saturate it with a polyester, vinyl ester, or epoxy resin. The resin is sometimes mixed by hand or using an automated mechanical mixer, manually
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