The following enhancement has been logged:
TFS-E 659442 : Add Flange Leakage Evaluation based on NC 3658.3 Method
Until this feature is added to AutoPIPE, suggest the following workaround:
Manually calculate the Design Pressure to be used in the calculations as per 3658.3 and use Appendix XI method (available in AutoPIPE) to design the flanges.
1. Compare NC 3658.3 method (shown above) to ANSI Check / Equivalent Pressure method (shown below) find that these two methods are very similar. Notices that the axial term is ignored by NC 3658.3 method.
This would make NC 3658.3 method less conservative then ANSI Check method and explains why more flanges would pass analysis. However, NC 3658.3 method is for Nuclear piping, while other factors are considered for non-Nuclear piping care should exercised when choosing a flange analysis method.
2. Design requirements would govern which Flange Analysis method should be used for flange checks. It should not be based on which method passes all flanges.
Flange Analysis Enhancements