Shukla,

Thanks for your reply. But i have not used any intermediate skirt nor do the tailing lug.

I have found the solution, its because i had some values fed in the Installation / Miscellaneous tab. I entered 'Zero' there and now its working


Ray,

Actually we are not into the design of Pressure vessel fully....hence we have not upgraded the version. At present, We use PV Elite to perform some in-house checks.