How does the use of internal coatings affect the cathodic protection current demand for a pipeline?

The use of internal coatings significantly reduces the cathodic protection (CP) current demand for a pipeline because the coating acts as a barrier between the steel and the corrosive environment inside the pipe. Cathodic protection works by applying a direct current to the pipeline, making it the cathode in an electrochemical cell and preventing corrosion. Without an internal coating, the entire internal surface of the pipeline is exposed to the corrosive fluid, requiring a significant amount of CP current to maintain adequate protection. An effective internal ....