PWSA Large Diameter Sewer Rehabilitation
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PROJECT details
Client: The Pittsburgh Water and Sewer Authority (PWSA)
Location: Pittsburgh, PA
Capabilities: Rehabilitation
Services: Bypass Pumping, Geopolymer, CCTV & Cleaning
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This project involved the trenchless rehabilitation of sewer mains, which included the inspection, evaluation, and Geopolymer Lining rehabilitation of three sewer segments to restore structural integrity. It consisted of rehabilitating several sewer pipelines in question by utilizing Geopolymer lining. The pipe rehabilitation involved the following line segments, 680 linear feet of 48-inch sanitary brick sewer, 680 linear feet of 60-inch sanitary brick sewer, and 150 linear feet of 101-inch brick arched sewer pipe. It required an overall total of over 450,000 pounds of geopolymer material applied in thicknesses ranging from 1-inch thick up to 2-inches thick. This internal sprayed-on rehabilitation will extend the life of the pipe over 50 years and also have saved the owners millions of dollars in excavation and bypass work to expose and replace the pipe.
Careful planning with the Pittsburgh Zoo and PPG Aquarium was important because of the project’s close proximity. This project received a Diamond Award in the Waste and Stormwater Category at the 2024 Diamond Awards for Engineering Excellence, presented by ACEC/PA.
