Flow Study of In-Service Sanitary Sewers Rehabilitated with Insitupipeby Lisa I. Harris, Insituform Technologies, Inc, Memphis, United States,
Larry J. Oliver, Insituform Technologies, Inc, Memphis, United States,
Abstract: In an effort to define the flow characteristics of sanitary sewer segments rehabilitated with Insituform under normal in-service conditions, Insituform of North America, Inc. (currently Insituform Technologies, Inc.) contracted with Sverdrup Corporation, St. Louis, Missouri, to conduct a flow study in the St. Louis metropolitan area. The study, which was conducted during the fall of 1989, was designed to evaluate the Manning Roughness Coefficient ('n') of Insitupipe relative to traditional pipe materials in uncleaned, in-service sewers. A dye dilution technique was used to measure flow in 11 in-service test segments. Test results indicated that the average Manning Roughness Coefficient ('n') of uncleaned, in-service Insitupipe was 33% better than that for uncleaned, in-service pipes of traditional concrete and clay materials. This lower pipe roughness can be attributed to the smoothing of pipe irregularities resulting from the Insituform installation, elimination of joints, and the non-wetting nature of the Insitupipe surface. This flow testing program was initiated through Insituform's participation in the ASCE Pipeline Infrastructure (PINS) Hydraulic Task Committee. The test results have been incorporated in the revision of ASCE Manual of Practice No. 62.
Subject Headings: Sanitary sewers | Rehabilitation | Flow measurement | Pipelines | Hydraulic roughness | Pipe flow | Pipe materials | Concrete pipes | North America | Missouri | United States
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