dustoneg

So settling = vertical forces, and quake = horizontal forces. Therefore settling does not cover quake as I proposed further above. But the piping penetrating the wall should be able to handle both stresses by design.

qcvdrill

I can't explain, because I don't understand, why vertical movements of earthquake effects are not specifically included.??It makes no sense to me, unless you figure the earth moves uniformly in the vertical direction during an earthquake.??I can't see how that is reasonable.??In any case, if I thought vertical earthquake loads/movements were significant to the piping, I would include them regardless of what you can quote from the code.??Codes are minimum requirements and do not supercede engineering judgement.