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3. PD 6493: Guidance on methods for assessing the acceptability of flaws in fusion welded structures. London: BSI, 1991.
4. BS 7910: Guide on methods for assessing the acceptability of flaws in fusion welded structures. London: BSI, 1999.
5. API 1104: welding of pipelines and related facilities. Appendix A: alternative acceptance standards for girth welds,1994