![]() ![]() ![]() It describes a three-tier approach with Options 1-3 assessments for fracture mechanics-based analysis of pipeline girth welds. The procedure was published by API in July 2007, replacing Appendix A of the 2005 edition of API 1104. The US Department of Transport and PRCI funded a programme to update API 1104 Appendix A, details of which were published at the IPC 2006 conference. Example cases were undertaken to compare predicted tolerable flaw sizes using each procedure. Assessments to API 1104 were more likely to predict failure by plastic collapse than those to BS 7910. Generally, there was little difference between the two procedures, although assessments to BS 7910 were slightly closer to the assessment curve than those to API 1104. Both procedures predicted failure but by widely ranging margins of safety. Results from full-scale pipe bend tests and wide plate tests are used to plot assessment points for both procedures. ![]() The 2007 revision to API 1104 Appendix A for assessing flaws in pipeline girth welds is compared with BS 7910 Level 2 assessment procedures. Paper presented at 5th International Pipeline Technology Conference, Ostend, Belgium, 12 - 14 October 2009. National Structural Integrity Research Centre.Structural Integrity Research Foundation.
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