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Title: Multifrequency Eddy Current Inspection Of Gas Transmission Pipelines
Author: Donald T. Hayford, William D. Mink
Source: American Gas Association 1984
Year Published: 1984
Abstract: This paper discusses certain aspects of the development and testing of a multifrequency eddy current system to detect the presence of cracks in gas transmission pipelines. The work discussed here was conducted by Battelle Columbus Laboratories for Columbia Gas System Service Corporation during the period 1981 to 1984. Gas transmission pipelines, especially the older uncoated lines, are subject to corrosion pitting. If the pit grows through the pipe wall, a leak develops which is repaired when located by field repair crews. Typically, the repair is made by clamping a rubber gasket over the leak. Although it is rare, there is a possibility that a crack is located in the same region as the pit. In these cases, it may be desirable to replace a section of the pipeline rather than trying to repair the leak, since the forces placed on the pipe by the clamp could cause the crack to propagate. Since the cracks are invisible to the naked eye, some other means of detecting their presence must be found.

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