Paragraph IWB-3641 of Section XI [1] permits the use of Nonmandatory Appendix C or H to perform the analytical evaluation of flaws in austenitic and ferritic piping. When considering welded austenitic material, Appendix C does not include the welding residual stress as an input to the calculations for maximum allowable flaw length and depth. In contrast, Appendix H does include the welding residual stress when the K′r coordinate on the failure assessment diagram curve is calculated for austenitic materials. This paper calculates the maximum allowable axial and circumferential flaws in a welded austenitic component subject to internal pressure loads using Appendix C procedures and using Appendix H procedures. The results are compared to investigate cases where a flaw may be acceptable using one set of procedures and not acceptable using the other.

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