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Stray current corrosion seen as problem for gas utilities. M.J. Szeliga. Pipeline Gas Ind., March 1998, 81(3), 77--85.

Pipeline corrosion that develops as a result of stray current activity is described. It particularly concerns utility companies with gas mains adjacent to rail transport systems that operate on d.c. current. Remedial measures are discussed. They include decreasing the conductivity of rails to earth by using insulated track fasteners, and utility companies can increase the resistance of underground pipelines by using insulation coatings and by improving cathodic protection techniques. These options are reviewed. Test facilities for monitoring stray currents are described and illustrated. Regular monitoring is recommended and data are collected by computer loggers or with strip chart recorders.

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