Ray,

Thanks for the reply. We have a client and they have couple of storage tanks. Generally every tank have PSV on top. They telling us to find out what is max allowable pressure can tank hold? so they can set PSV less than the MAWP values (PSI).

1, So I did the Tank model and run the analysis. there is a calculation in tank software - Appendix F - Calculated failure pressure - I think this MAWP.

Please let me know the equation so that I can verify (code equation).

2, For MAVP - max allowable working vacuum - That means the external pressure? ((lb/ft^2)


I appreciate your help.

Thanks - Mayur