Does AutoPIPE have a setting to switch between using ASME B31.3 eq. 3a or eq. 3b?
AutoPIPE only uses equation 3a in analyzing a model per ASME B31.3.
If you like to see an option added to switch between the 2 equations, please log a Bentley Service request mentioning this site.
ASME B31.3 Piping Code Calculation Issues