Good day to you Geping, Most questions on how the flange analysis calculations are performed can be answered by the following AutoPIPE help section: Scroll down to the appropriate selection and open the folder to see step by step procedure with details on calculations performed. Be sure to read all the information including all notes. In your case, suggest that you review ANSI Section III and ANSI Check procedures. Regards, Mike Dattilio Bentley Systems Design Analyst Design Engineering Analysis group ===================================================
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