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10069 Finding and Determining the Cause of External Corrosion on Coated and Cathodically Protected Pipelines

Picture for 10069 Finding & Determining Cause of External Corrosion on Coated & Cathodically Protected Pipelines
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Product Number: 51300-10069-SG
ISBN: 10069 2010 CP
Author: Richard Norsworthy
Publication Date: 2010
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Direct Assessment is a very good method of determining if external corrosion is a potential problem on a coated and cathodically protected pipeline. The type of coating can be critical in finding where and if external corrosion is a problem. Many times external corrosion can not be located through over the line surveys because cathodic protection potentials indicate adequate protection, therefore there should be no external corrosion, yet internal line inspection (ILI) tools find corrosion. Many times the cause and age of the corrosion are not properly evaluated when performing direct assessment of these pipelines. This paper will discuss common sense evaluation methods for determining why external corrosion still exists and in some cases continues even with apparent adequate cathodic protection.

KEY WORDS: Cathodic protection, CP shielding, Coating Deterioration, ECDA, DCVG, ACVG
Direct Assessment is a very good method of determining if external corrosion is a potential problem on a coated and cathodically protected pipeline. The type of coating can be critical in finding where and if external corrosion is a problem. Many times external corrosion can not be located through over the line surveys because cathodic protection potentials indicate adequate protection, therefore there should be no external corrosion, yet internal line inspection (ILI) tools find corrosion. Many times the cause and age of the corrosion are not properly evaluated when performing direct assessment of these pipelines. This paper will discuss common sense evaluation methods for determining why external corrosion still exists and in some cases continues even with apparent adequate cathodic protection.

KEY WORDS: Cathodic protection, CP shielding, Coating Deterioration, ECDA, DCVG, ACVG
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