March 2015, Vol. 242, No. 3

TechNotes

Cathodic Shielding Effects Tested: PipePillo vs. Foam

Perhaps one of the most important safe guards put in place to maintain the long-term integrity of buried pipelines is a cathodic protection system. Cathodic protection (CP) is an anti- corrosion technique used to prevent the corrosion of metals such as steel and iron in electrolytically conducting environments such as seawater and soils containing water. In the case of buried pipelines, CP is achieved when one or more anodes (positive electrodes) discharge electric current to protect the pipeline, which acts as a cathode (negative electrode). If the CP system is electrically cut-off (shielded) from the pipeline where a holiday (a hole or gap in the pipeline coating) has occurred, then the

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