Thanks for your responses.
IFRs,
I agree with you. My point is if the first criteria is for empty condition, can I put atmospheric pressure for Mpi,as for our case, there is no internal pressure in empty condition other than atmosphere ?
Based on the API safety factor table, factor of 1.5 is...
Please advise if my interpretation as below of the criteria#1 of 5.11.2.1 of API-650 is appropriate.
This criteria appears to be applicable only when the tank is empty of its contents. A tank empty condition could exist before commissioning when the internal pressure would be zero. In our case...