THE British Standards Institute has issued a new draft technical specification on the Evaluation of AC corrosion likelihood of buried pipelines: application to cathodically-protected pipelines. This draft is now being circulated for discussion, and is applicable to buried or immersed cathodically-protected metallic structures that are (or maybe) influenced by AC traction systems and/or AC power lines.
BSI points out that, in the presence of AC interference, the criteria given in EN 12954:2001, Table 1, are not sufficient to demonstrate that the steel is being protected against corrosion, and the new technical specification provides limits, measurement procedures, and information to deal with long-term AC interference and evaluating the likelihood of AC corrosion. This is therefore an important document providing detailed information and measurement techniques for the evaluation of such problems on buried pipelines. It gives up-to-date guidance to corrosion engineers and pipeline operators to help understand this phenomenon that is of concern, particularly, to pipelines having very high quality coatings and running parallel to high-voltage overhead transmission lines.
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