There are a number of analytical techniques which can be employed during the course of a pipeline failure investigation to assist in the collection of all the pertinent information essential to determining the cause of failure. The key is to select the appropriate analytical techniques at the beginning of the investigation and involve experienced and qualified people in every facet of the examination and testing process. Case studies described in this paper involve stress corrosion cracking, external corrosion on a gas transmission pipeline, cracking of fibreglass line pipe, failure of a new mechanical interference fit pipeline joint and mill defects in a large diameter submerged arc weld seam.

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