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Consistent with a growing trend in water main rehabilitation throughout California, the City of South Pasadena recently turned to sliplining with Fusible PVC® pipe to rehabilitate a failing 16" steel water main. After enduring multiple leaks and repair efforts, the City and its engineer, DMR Team Inc. of Culver City, CA, decided it was time to structurally rehabilitate or replace the decades old 15,000 LF, 16" steel water transmission line.
Complicating matters was the pipeline's alignment, which traversed four separate municipalities in the center of high traffic streets. Replacing the pipeline via traditional open cut construction methods was an unattractive option due to the extensive excavation required and the resulting traffic disruption. To limit the impact to local residents and businesses, the City and DMR Team evaluated several trenchless/low-dig rehabilitation options. Ultimately sliplining was selected as the preferred solution based on its combination of low traffic impact and ability to provide a fully independent, structural liner inside the existing host pipe. The City's requirement that new pipe meet AWWA and NSF standards while maintaining the greatest possible flow area led it to select Fusible PVC® pipe. Sam Talebian of the DMR Team commented: "Based on these criteria and the ability to use standard off-the-shelf fittings for reconnection, maintenance, and repair, it was clear that Fusible C-900® pipe was the right material choice for this project."
Due to the extensive scope of the project it was split into two construction phases. The first phase, installation of 5,720 LF of 12" DR14 Fusible C-900® pipe, was awarded to T.A. Rivard, Inc. of Riverside, CA with sliplining, reconnection, and pressure testing were completed in early July 2010. Phase 2 (8,960 LF), completed by J.F. Creamer and Spinello, was awarded in March of 2011 and back in service in June 2011.
Tim Rivard of T. A. Rivard stated: "By setting the installation up as a fuse-and-pull operation, we minimized our work envelope and were able to keep traffic flowing uninterrupted while maintaining excellent production rates. UGSI's fusion technicians worked efficiently with our crew and we completed the project well ahead of schedule."