A number of failures have been attributed to longitudinal cracking on large diameter liquid pipelines. Cracks caused by third party damage and railroad fatigue are discussed. Third party damage cracks originate from gouged dents caused by construction equipment striking the pipeline. The railroad fatigue cracks originate at the toe of tire longitudinal weld as a result of improper loading during transportation. An inspection program was developed to detect each of these cracking types. These inspection programs will be explained and examples of pipe anomalies demonstrated.

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