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Is the governing thickness for PWHT in ASME Div1 also governed by the butt-welds in the segments of a vacuum ring ? Many Thanks

I am starting to make a study on how to design a mounded storage tank ( cylindrical in sand bed and spherical on concrete ring-support covered with sand ). Is there anywhone who can give information on how to start such a study. I searched Internet but the only interesting document I found was...

If Z=0 , does this mean earthquake need not to be considered , because if using Z=0 , the factors Ca and Cv for earthquake design are not listed ?

Our client specifies the use of UBC 97 , Zone 0 , Soil type SD. However table 16-I defines no Z-factor for Zone 0. Can you please help me out ?

I am designing the lifting trunnions of a pressure vessel and calculate the effect of the loading of the trunnion on the shell as a WRC107 local load calculation. WRC reports the membrame and membrame+bending stress. Membrame should be compared to 1.5xSallow. The allowable membrame+bending is...