Repairing and Debugging of the Cathodic Protection System for an Urban Sewage Pipe

For the lack of the cathodic protection potential of the sewage pipe, dual-reference electrodes were installed in the end of the sewage pipe in seawater. The current output of potentiostat was adjusted by measuring the protection potential of the sewage pipe end, and constant current method was applied to control the cathodic protection system which made the pipeline potential lower than -0.85 V(CSE), thus the whole pipeline was protected completely.