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Study examines coating compatibility with CP

05/25/2009
For a pipeline coating to be truly compatible with cathodic protection (CP), the coating should allow CP protection to the pipe even if disbondment occurs and water penetrates between the coating and pipe. CP must be adequate to provide the needed current to significantly reduce or eliminate the corrosion under the nonshielding disbonded coating. Coatings that shield CP when there is a disbondment are a major cause of external corrosion problems on pipelines. Even with proper application some coatings can disbond through soil stress and other methods. BackgroundWhen applying CP to coated pipelines, end users must consider the problems faced if the coating disbonds. CP current is very effe...
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