A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Sequoia Aqueduct RCCP Hot Tap
East Bay Municipal Utility District’s Sequoia Aqueduct is a 20-mile long 48-inch inside diameter reinforced concrete cylinder pipe (RCCP) constructed in 1929. The RCCP was manufactured by the Lock Joint Pipe Company. Connected to the aqueduct was a 24-inch diameter 1929 steel pipeline with an extensive leak history. In order to replace this pipeline while maintaining service, a 24-inch hot tap on the aqueduct was designed. AWWA Manual M9 for Concrete Pressure Pipe only recommends a strap-on prefabricated tapping saddle for tapping RCCP. This system requires a rubber gasket and grout to keep the joint watertight. Manual M9 explicitly does not recommend weld-on tapping assemblies citing concerns with damaging the steel cylinder during welding. However, a welded connection was designed and installed in order to achieve a zero leakage permanent connection. This paper describes the design details and construction requirements utilized to mitigate M9 concerns and make an improved flanged outlet.
Sequoia Aqueduct RCCP Hot Tap
East Bay Municipal Utility District’s Sequoia Aqueduct is a 20-mile long 48-inch inside diameter reinforced concrete cylinder pipe (RCCP) constructed in 1929. The RCCP was manufactured by the Lock Joint Pipe Company. Connected to the aqueduct was a 24-inch diameter 1929 steel pipeline with an extensive leak history. In order to replace this pipeline while maintaining service, a 24-inch hot tap on the aqueduct was designed. AWWA Manual M9 for Concrete Pressure Pipe only recommends a strap-on prefabricated tapping saddle for tapping RCCP. This system requires a rubber gasket and grout to keep the joint watertight. Manual M9 explicitly does not recommend weld-on tapping assemblies citing concerns with damaging the steel cylinder during welding. However, a welded connection was designed and installed in order to achieve a zero leakage permanent connection. This paper describes the design details and construction requirements utilized to mitigate M9 concerns and make an improved flanged outlet.
Sequoia Aqueduct RCCP Hot Tap
McLeod, Marshall (author) / Moita, Krista (author)
Pipelines 2019 ; 2019 ; Nashville, Tennessee
Pipelines 2019 ; 493-498
2019-07-18
Conference paper
Electronic Resource
English
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