External Corrosion Direct Assessment

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.

Pipeline Integrity

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. 

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