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- W2053906935 abstract "This paper presents a case study of a Prestressed Concrete Cylinder Pipe (PCCP) system that is experiencing deterioration and a failure resulting from internal corrosion. The corrosion mechanism is Sulfuric Acid attack due to Hydrogen Sulfide gas (H2S) generated from the wastewater. The PCCP pipeline is located in Regina, Saskatchewan, Canada and was constructed in 1979. The nominal inside diameter is 1350 mm (54) and the pipeline was designed as a sewage force main. In 1999, approximately 75 m (246 feet) of the pipe failed and was replaced with HDPE pipe. In 2008, an internal inspection was conducted downstream of the failed section. The inspection was conducted using man entry and by close circuit television (CCTV). The inspection found five (5) pipe sections under severe corrosion attack where the interior concrete surfaces near the crown of the pipe had deteriorated exposing the reinforcing. Another nine (9) sections also showed early signs of H2S attack. A post inspection hydraulic analysis indicated the deteriorating pipe section does not flow full, and the hydraulic regime along this section is supercritical transitioning to subcritical resulting in a hydraulic jump forming within the pipe. The wastewater contains high concentration of sulfides. The turbulent flow conditions at the hydraulic jump exacerbate the release of H2S gas from the aqueous phase to the air phase. The H2S gas collects near the crown of the pipe and initiates corrosion attack on the concrete surface. A rehabilitation strategy was developed to extend the service life of the PCCP force main." @default.
- W2053906935 created "2016-06-24" @default.
- W2053906935 creator A5000537340 @default.
- W2053906935 date "2011-07-28" @default.
- W2053906935 modified "2023-10-16" @default.
- W2053906935 title "Internal PCCP Force Main Deterioration—Analysis and Rehabilitation" @default.
- W2053906935 cites W1574958710 @default.
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- W2053906935 doi "https://doi.org/10.1061/41187(420)37" @default.
- W2053906935 hasPublicationYear "2011" @default.
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