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You'll have to model your problem as a 3d solid FEM. The peak thermal stress equation is based on a thin-shell assumption. You cannot use is as-is for a thick-shell calc.

@IceBreakerSours & 3DDave, Thx for the information. Your responses made for an intresting read.

I don't understand your argument of comparing thick-shell theoretical numbers to thin-shell results. But considering your new dimensions and the material & pressure/temp loading specs which your have posted above I don't understand those theoretical numbers either. I've hand-calc'ed (thick &...

@Ali baba Sx Just a silly questions.. What governs the shape of the elements?? We talk of trias/quad shapes. Why don't we have elements circular in shape?? On the top of my head I can think of using circular shape elements at areas of stress concentration (plate with a hole for example).

Questions - where are these stresses measured? Outer/inner & middle/ends of the pipe?? - what are these new dimensions?? - same max pressure and max delta-temp as earlier??

@Beef Supreme This topic has been hashed and rehashed quite a number of times on this forum. Follow the discussion in these links for some perspective: https://www.eng-tips.com/viewthread.cfm?qid=378607 https://www.eng-tips.com/viewthread.cfm?qid=120567...