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07154 Pipeline Coatings, External Corrosion and Direct Assessment

Picture for 07154 Pipeline Coatings, External Corrosion and Direct Assessment
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Product Number: 51300-07154-SG
ISBN: 07154 2007 CP
Author: David Norman and Colin J. Argent
Publication Date: 2007
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The pipeline coating is the first line of defence against corrosion and cathodic protection is used to control corrosion risks at sites of coating damage. However, some coating systems show failure modes that interfere with the effectiveness of the cathodic protection and create a new corrosion risk. These risks include CP shielding, microbial corrosion and external stress corrosion cracking. This paper describes and defines failure modes for pipe and field joint coatings and identifies which failure modes create the conditions for CP shielding. Comment is then made on sampling patterns for excavation and direct examination and on additional tests that may clarify the long term behaviour of the coating systems.
The pipeline coating is the first line of defence against corrosion and cathodic protection is used to control corrosion risks at sites of coating damage. However, some coating systems show failure modes that interfere with the effectiveness of the cathodic protection and create a new corrosion risk. These risks include CP shielding, microbial corrosion and external stress corrosion cracking. This paper describes and defines failure modes for pipe and field joint coatings and identifies which failure modes create the conditions for CP shielding. Comment is then made on sampling patterns for excavation and direct examination and on additional tests that may clarify the long term behaviour of the coating systems.
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