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TR21447-2020, Consequences of Coating Failures as Related to Interaction with Cathodic Protection

The purpose of this NACE International technical report is to provide basic information regarding the mechanisms involved with cathodic protection (CP) shielding for external coatings applied to carbon steel pipelines, and the manner in which the breakdown of coating systems may or may not contribute to CP shielding. It is intended to be a basic reference from which the tendency of a coating system to fail and shield CP may be understood on a conceptual basis. Non-corrosion-related pipeline protection systems, including concrete weight coating, polyethylene encasement, insulation, and mechanical pipeline protection systems, are outside the scope of this report. End users of this report may include pipeline designers, corrosion engineers, integrity management specialists, regulators, CP service providers, coating suppliers, coating service providers, equipment suppliers, and pipeline/facility owners.

Product Number: TR21447-2020
Publication Date: 2020
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The purpose of this NACE International technical report is to provide basic information regarding the mechanisms involved with cathodic protection (CP) shielding for external coatings applied to carbon steel pipelines, and the manner in which the breakdown of coating systems may or may not contribute to CP shielding. It is intended to be a basic reference from which the tendency of a coating system to fail and shield CP may be understood on a conceptual basis. Non-corrosion-related pipeline protection systems, including concrete weight coating, polyethylene encasement, insulation, and mechanical pipeline protection systems, are outside the scope of this report. End users of this report may include pipeline designers, corrosion engineers, integrity management specialists, regulators, CP service providers, coating suppliers, coating service providers, equipment suppliers, and pipeline/facility owners.

Key Words: asphalt enamel coatings, barrier coatings, cathodic disbondment, cathodic protection (CP), coal tar enamel coatings, coatings, corrosion control system, external coatings, external corrosion direct assessment fusion-bonded epoxy coatings, galvanizing. gas transmission pipelines, heat shrink sleeve (HSS) systems, inhibitive coatings, integrity management of pipelines, internal corrosion direct assessment, NACE SP0169, NACE SP0185, Ohm’s Law, petrolatum tape coatings, pipelines, pipeline corrosion, polyurethane, sacrificial coatings, shielding, stress corrosion cracking, TG 523, thermal spray aluminum (TSA), TR21447, ultrasonic testing (UT), zinc-chromate, 49 CFR Part 192.461

The purpose of this NACE International technical report is to provide basic information regarding the mechanisms involved with cathodic protection (CP) shielding for external coatings applied to carbon steel pipelines, and the manner in which the breakdown of coating systems may or may not contribute to CP shielding. It is intended to be a basic reference from which the tendency of a coating system to fail and shield CP may be understood on a conceptual basis. Non-corrosion-related pipeline protection systems, including concrete weight coating, polyethylene encasement, insulation, and mechanical pipeline protection systems, are outside the scope of this report. End users of this report may include pipeline designers, corrosion engineers, integrity management specialists, regulators, CP service providers, coating suppliers, coating service providers, equipment suppliers, and pipeline/facility owners.

Key Words: asphalt enamel coatings, barrier coatings, cathodic disbondment, cathodic protection (CP), coal tar enamel coatings, coatings, corrosion control system, external coatings, external corrosion direct assessment fusion-bonded epoxy coatings, galvanizing. gas transmission pipelines, heat shrink sleeve (HSS) systems, inhibitive coatings, integrity management of pipelines, internal corrosion direct assessment, NACE SP0169, NACE SP0185, Ohm’s Law, petrolatum tape coatings, pipelines, pipeline corrosion, polyurethane, sacrificial coatings, shielding, stress corrosion cracking, TG 523, thermal spray aluminum (TSA), TR21447, ultrasonic testing (UT), zinc-chromate, 49 CFR Part 192.461