A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Optimizing PCCP Rehabilitation Based on Lessons Learned during Construction of Metropolitan’s PCCP Rehabilitation Program
The Metropolitan Water District of Southern California (Metropolitan) is implementing a multiyear program to rehabilitate Metropolitan’s portfolio of large diameter prestressed concrete cylinder pipe (PCCP) transmission mains (feeders). The program includes prioritization and rehabilitation of the PCCP portions of five at-risk feeders within greater metropolitan Los Angeles. Among these five feeders, there is a total of approximately 100 mi of PCCP to be rehabilitated, ranging in size from 54-in. to 150-in. in diameter. Metropolitan started the rehabilitation program with the Second Lower Feeder, due to its condition, history of relining, presence of corrosive soils and third-party stray currents, and high internal operating pressure. The rehabilitation design of the Second Lower Feeder commenced several years in advance of the other feeder pipelines to establish the general design standards for the overall program. Rehabilitation of the remaining four pipelines is currently in preliminary design. The Second Lower Feeder includes 30 mi of 78 to 84-in. PCCP at a working pressure of up to 270 pounds per square inch (psi). To date, four reaches, totaling approximately 63,200 linear feet (LF) of PCCP, have been rehabilitated using coiled steel pipe during consecutive annual shutdown seasons to form a new fully structural liner. Coiled steel pipe is fabricated using steel plate cut to size, rolled longitudinally, and coiled on itself into a smaller diameter cylinder, and temporarily banded to allow insertion into the existing PCCP prior to expansion in its final location. This paper describes the lessons learned during construction of the first four reaches and how the rehabilitation design for future PCCP reaches has been refined as part of a continuous improvement feedback process.
Optimizing PCCP Rehabilitation Based on Lessons Learned during Construction of Metropolitan’s PCCP Rehabilitation Program
The Metropolitan Water District of Southern California (Metropolitan) is implementing a multiyear program to rehabilitate Metropolitan’s portfolio of large diameter prestressed concrete cylinder pipe (PCCP) transmission mains (feeders). The program includes prioritization and rehabilitation of the PCCP portions of five at-risk feeders within greater metropolitan Los Angeles. Among these five feeders, there is a total of approximately 100 mi of PCCP to be rehabilitated, ranging in size from 54-in. to 150-in. in diameter. Metropolitan started the rehabilitation program with the Second Lower Feeder, due to its condition, history of relining, presence of corrosive soils and third-party stray currents, and high internal operating pressure. The rehabilitation design of the Second Lower Feeder commenced several years in advance of the other feeder pipelines to establish the general design standards for the overall program. Rehabilitation of the remaining four pipelines is currently in preliminary design. The Second Lower Feeder includes 30 mi of 78 to 84-in. PCCP at a working pressure of up to 270 pounds per square inch (psi). To date, four reaches, totaling approximately 63,200 linear feet (LF) of PCCP, have been rehabilitated using coiled steel pipe during consecutive annual shutdown seasons to form a new fully structural liner. Coiled steel pipe is fabricated using steel plate cut to size, rolled longitudinally, and coiled on itself into a smaller diameter cylinder, and temporarily banded to allow insertion into the existing PCCP prior to expansion in its final location. This paper describes the lessons learned during construction of the first four reaches and how the rehabilitation design for future PCCP reaches has been refined as part of a continuous improvement feedback process.
Optimizing PCCP Rehabilitation Based on Lessons Learned during Construction of Metropolitan’s PCCP Rehabilitation Program
Stanton, Andrew (author) / Aldrete, José D. (author) / Clemmons, Jeremy (author) / Kuhlmann, Kristi (author)
Pipelines 2021 ; 2021 ; Virtual Conference
Pipelines 2021 ; 416-425
2021-07-29
Conference paper
Electronic Resource
English
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