This paper summarizes the main mechanism and influencing factors for Hydrogen Induced Cracking. The evolution of HIC test requirements over nearly 30 years for linepipe intended for sour service are reviewed. Some typical examples of the requirements for sour service pipe production at Europipe (formerly Mannesmann) developed over the past 20 years and the details of trial production of sour service pipes in grade X 70 with 30 mm wall thickness are presented. However, with the steadily increasing demands it becomes progressively more difficult to fulfill the before mentioned standard test conditions. In those cases where the overall profile of requirements (strength, toughness) can not be consistently achieved, fit-for-purpose testing methods are currently emerging. As an example the results of a pipe order, where the fit-for-purpose approach has been used to qualify the pipe for a special project, will be described.

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