I reviewed ANSI Check and Section III Appendix XI in Autopipe Help. I don't see the effective flange pressure (P+Peq) is mentioned in Appendix XI method. I did hand calculations for H and Wm1, and compared them to the H and Wm1 from flange analysis report. I found Autopipe Flange Check Appendix XI Method does not replace P with P+Peq; therefore my conclusion is Appendix XI Method in Autopipe does not check an NS flange for the requirements of NC-3658 (I do not find an option for checking either NC-3658.1, NC-3658.2 or NC-3658.3 in Autopipe Flange Check). Please advise whether my conclusion is correct.
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