Metallic under-layer coating as third line of protection of underground oil and gas pipelines from external corrosion

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DOIResolve DOI: http://doi.org/10.5006/0566
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TypeArticle
Journal titleCorrosion
ISSN0010-9312
Volume68
Issue12
Pages11461153; # of pages: 8
Subjectcathodic protection, external corrosion, metallic under-layer coating, oil and gas pipelines, polymeric coating
AbstractThis paper presents the concept of introducing a third line of defense in the form of a metallic under-layer coating—in addition to the traditional polymeric coating and applied cathodic protection (CP)—to protect the external surface of oil and gas pipelines. The three levels of protection would be the metallic under-layer coating, the polymeric top-layer coating, and the applied CP. This three-level system would be beneficial when the applied CP current is shielded from the pipeline by a dis-bonded polymeric coating, thermal insulator, or highly resistive soil. Two different combinations of metallic under-layer and polymeric top-layer coatings are presented to demonstrate this concept: 48%Zn and 52%Al under-layer with four different top-layer coatings: fusion-bonded epoxy (FBE), composite, urethane, and coal tar epoxy. Urethane top-layer coating with four different metallic under-layers: 48%Zn-52%Al, 85%Zn-15%Al, Al, and Zn. The criteria for the successful application of this concept also have been described.
Publication date
LanguageEnglish
AffiliationAutomotive and Surface Transportation; National Research Council Canada
Peer reviewedYes
NPARC number21269126
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Record identifier67e551b5-8a8b-44d1-a853-c8a04afa514d
Record created2013-12-09
Record modified2016-05-09
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