Peter Nicholson, Pipeline Rehabilitation & Maintenance, September 2006
All underground/underwater metallic pipelines are subject to corrosion where there are inadequate levels of cathodic protection. Cathodic protection is the only method of reducing or halting external corrosion on underground/underwater pipelines.
J. Peter Nicholson, World Pipelines, March 2003
Cathodic protection is an electrical method of reducing the corrosion rate of buried or submerged metallic structures, such as a pipeline. Since cathodic protection requires the flow of electrical current through the soil and onto the pipeline, chemical changes occur at the pipeline soil interface.