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Composite Repairs And Cathodic Protection

Picture for Composite Repairs And Cathodic Protection
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The motivation for this work was to perform a comprehensive test program to investigate several commercially available composite repair systems and their interactions with cathodic protection. Multiple test methods were utilized to prove there remains a low probability of shielding for composites of typical thickness and in a typical environment. This work will also discuss how results from current industry qualification tests (such as those specified in ASME PCC-2) can be considered when making long-term decisions regarding the effects of cathodic protection on composite repairs and the pipelines on which they are installed. This paper provides an innovative approach to test and validate the interactions of cathodic protection with several commercially available composite repair systems.

Product Number: 51322-17825-SG
Author: David B. Futch, Davie Peguero, ,\Casey Whalen, Stephen Barnett
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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$20.00
$20.00

Composite repairs have been extensively used over the past twenty-plus years as a high-integrity repair technology for high pressure transmissions pipelines. Numerous industry test programs have increased the knowledge related to repair techniques, repair design, and quality control of installations. However, little work has been performed related to the interactions of cathodic protection and composite repairs. This paper reviews several approaches for determining if cathodic shielding may occur under a composite repair.

Preventing cathodic shielding can be considered in two different phases. First, the coating (or composite repair) must disbond or fail creating a local environment below the coating. Secondly, the coating (or composite repair) must allow for the permeation of cathodic current to the pipe surface providing the corrosion protection. Current industry standards, such as ASME PCC-2, can address the first aspect by examining the results of the cathodic disbondment tests and quantifying the level of disbondment. The second aspect can be addressed through an innovative and comprehensive test program that investigates several commercially available composite repair systems and their interactions with cathodic protection. Multiple test methods were utilized to prove there remains a low probability of shielding for composites of typical thickness and operating environment.

Composite repairs have been extensively used over the past twenty-plus years as a high-integrity repair technology for high pressure transmissions pipelines. Numerous industry test programs have increased the knowledge related to repair techniques, repair design, and quality control of installations. However, little work has been performed related to the interactions of cathodic protection and composite repairs. This paper reviews several approaches for determining if cathodic shielding may occur under a composite repair.

Preventing cathodic shielding can be considered in two different phases. First, the coating (or composite repair) must disbond or fail creating a local environment below the coating. Secondly, the coating (or composite repair) must allow for the permeation of cathodic current to the pipe surface providing the corrosion protection. Current industry standards, such as ASME PCC-2, can address the first aspect by examining the results of the cathodic disbondment tests and quantifying the level of disbondment. The second aspect can be addressed through an innovative and comprehensive test program that investigates several commercially available composite repair systems and their interactions with cathodic protection. Multiple test methods were utilized to prove there remains a low probability of shielding for composites of typical thickness and operating environment.

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Penetration of Cathodic Protection into Pipeline Coating Disbondment

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An experimental setup was designed to investigate the cathodic protection (CP) penetration into coating disbondment. Embedded detection probes underneath the disbondment enabled pH and steel potential measurements without disturbing the environment inside the disbondment.
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07036 PRACTICAL CONSIDERATIONS FOR UPPER LIMITS OF CATHODIC PROTECTION

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ISBN: 07036 2007 CP
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This paper reviews the concerns of applying excessive levels of cathodic protection current to pipelines and the need for establishing an upper potential limit. Coating disbondment, hydrogen induced stress cracks, stress corrosion cracking, hard spots and the problems associated with measurement of a true polarized pipe-to-electrolyte potential are addressed.
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51318-10544-Cathodic Protection, Coatings that Shield Cathodic Protection, Stress Corrosion Cracking and Corrosion Assessment in Aging Coated Pipe Lines and Buried Utility Structures

Product Number: 51318-10544-SG
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Here we would like to elaborate on corrosion risk associated with coatings that shield cathodic protection.
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