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Title: Preliminary Observations Of The Shielding Effects Of Con Crete And Foam External Pipeline Barrier Coatings
Author: Daniel P. Werner, Thomas J. Barlo, Keith E. W. Coulson
Source: American Gas Association 1990
Year Published: 1990
Abstract: Natural gas transmission pipelines are protected by the application of an anti-corrosion coating and cathodic protection. To protect the coating from damage, an impact-resistant barrier-coating is applied over the anti-corrosion coating when the use of traditional sand backfill is not feasible. However, concerns have been raised that these barrier materials could shield the pipeline from cathodic protection currents. As a result, a laboratory program was initiated to determine which types of barrier materials posed a problem from the standpoint of cathodic protection current shielding. Laboratory exposure experiments have led to the tentative conclusion that the most commonly used barrier materials have tradeoffs in their physical and electrochemical properties but do not appear to significantly shield cathodic protection currents.

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