Hi, I have searched the forum but I wasn't able to find a clear answer to my question:
how do you check piping stresses due to tank loads under B31.3 code? I am not speaking about nozzle allowables.
Tank loads arise for soil settlement under tank weight, pressure head of contained fluid which makes the tank nozzle rotate (mainly near the bottom) and thermal displacements.
In my opinion all these loads are secondary loads, since they all cause nozzle displacements which stop at a given point.
But only thermal and pressure head loads can be considered truly cyclic.
I think that using Sh (hot allowable) is too much conservative, while using expansion allowable can be unsafe.
What are your thoughts about it?
Many thanks