The first known phenomenon of stress-corrosion cracking (SCC) in buried gas transmission pipelines was discovered in 1965.(1) Shortly thereafter, the NG-18 Committee of the Pipeline Research Committee of the American Gas Association initiated a research program at Battelle's Columbus Laboratories to investigate the causes for, and the means of mitigating, SCC. The factors which sustain SCC such as stress, temperature, pipe-to-soil potential and chemical environment were determined early in this program and have been reported elsewhere.(1-3)

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