51313-02174-Compatibility Between Concrete Coating Mainline Coating and CP System

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Product Number: 51313-02174-SG

ISBN: 02174 2013 CP

Author: Sankara Papavinasam

Publication Date: 2013

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Concrete coatings are applied on top of anti-corrosion coatings as weight coating. Concrete coatings are used in off-shore pipelines for buoyancy protection and in on-shore pipelines as backfill protection. Backfill protection with concrete is used in rocky locations and at river crossings. Application of concrete coatings on pipelines is relatively new. But steel-polymeric coatings-concrete system is extensively used in many structures including bridges and buildings. In those industries the use of epoxy anti corrosion coating beneath the concrete coating has been much debated. Some regulations in those industries require application of epoxy while others prohibit the use of epoxy coating beneath concrete coating i.e. in the infrastructure industry the use of concrete is mandatory while that of epoxy coating is optional whereas in the oil and gas industry the use of anti-corrosion coating is mandatory while concrete coating is used in special circumstances.

In this paper the laboratory methodologies used in the infrastructure industries have been critically evaluated for their applicability for pipelines. Long-term cathodic disbondment test has been carried out using a pipe sample protected with both epoxy anticorrosion coating and concrete coating. During the study the corrosion potential cathodic protection current and pH have been recorded. After the test the disbonded area of the anticorrosion coating was measured. From the online and postmortem results the compatibility between concrete coating mainline coating and cathodic protection has been investigated.