Search
Filters
Close

00755 PIPELINE COATING FAILURE - NOT ALWAYS WHAT YOU THINK 1T IS

Product Number: 51300-00755-SG
ISBN: 00755 2000 CP
Author: Dennis Neal
$0.00
$20.00
$20.00
Corrosion coating failure has traditionally been defined by the changes which occur in coatings exposed above ground. Blistering and loss of bond are considered to be examples of failure. Their significance with regard to pipeline coatings (underground or sub sea) is different because pipelines are cathodically protected. Coatings and cathodic protection together form a system designed to protect the pipeline from corrosion and cathodic protection itself causes or accelerates some of the changes. Fusion bonded epoxy is the most commonly used underground corrosion control coating in North America. Because it is thin, the effects of aging are visible earlier than with other coatings and include cathodic disbonding, moisture penetration, loss of bond and occasional blistering. This paper explains why and how these physical and chemical changes takes place. Many of the observations are similar to those found in above ground coatings. However, for FBE, they are not coating failure for two reasons: FBE is an excellent oxygen barrier and the coating is part of a corrosion control system, coating and cathodic protection. A new definition for corrosion coating failure is proposed: "An underground coating has failed when it is no longer economical to maintain cathodic protection."
Corrosion coating failure has traditionally been defined by the changes which occur in coatings exposed above ground. Blistering and loss of bond are considered to be examples of failure. Their significance with regard to pipeline coatings (underground or sub sea) is different because pipelines are cathodically protected. Coatings and cathodic protection together form a system designed to protect the pipeline from corrosion and cathodic protection itself causes or accelerates some of the changes. Fusion bonded epoxy is the most commonly used underground corrosion control coating in North America. Because it is thin, the effects of aging are visible earlier than with other coatings and include cathodic disbonding, moisture penetration, loss of bond and occasional blistering. This paper explains why and how these physical and chemical changes takes place. Many of the observations are similar to those found in above ground coatings. However, for FBE, they are not coating failure for two reasons: FBE is an excellent oxygen barrier and the coating is part of a corrosion control system, coating and cathodic protection. A new definition for corrosion coating failure is proposed: "An underground coating has failed when it is no longer economical to maintain cathodic protection."
PRICE BREAKS - The more you buy, the more you save
Quantity
1+
5+
Price
$20.00
$20.00
Product tags
Also Purchased
Picture for 00757 FBE, a Foundation for Pipeline Corrosion
Available for download

00757 FBE, a Foundation for Pipeline Corrosion Coatings

Product Number: 51300-00757-SG
ISBN: 00757 2000 CP
Author: J. Alan Kehr and David G. Enos
$20.00