ABSTRACT

The construction of a light-rail line that parallels an interstate highway necessitated crossing five large diameter water pipelines. Because of the high consequence of pipeline failure in the transit corridor, light-rail construction included retrofit casing and cathodic protection of the pipelines. This case study reviews construction of the box culvert casings and provides operating data pertinent to the design and operation of the impressed current cathodic protection system. This includes automatic rectifier control, placement of reference electrodes, placement of anodes, current requirements, and current distribution for stray current control.

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