I have some 3 and 4" Sch. STD A-106 Gr. B pipe with a design minimum temperature of -20F per curve B of Figure 323.2.2A. I am planning to use para 323.2.2(b) and Figure 323.2.2B to calculate my stress ratio and exempt it from impact testing with a new design minimum temperature of -50F.
Looking...
I think we might be on the same track now.
The reason I mentioned looking in the remarks (item 22) was because I was also looking at UG-19(a)(2). What I didn't realize is that UHX-19.3.1 is different than UG-120(b)(1)(-a). UHX-19.3.1 only requires a remark if the differential pressure design is...
I agree that the channel and/or front head plus nozzles for the tubebundle are external to the shell, but... the code says exactly the opposite regarding differential pressures.
UG-28(e): The external design pressure or maximum allowable external working pressure shall not be less than the...
I've noticed quite a few U-stamped shell and tube heat exchangers designed to BPVC.VIII.1-2017 that list the external MAWP of the inner chamber (tubeside) as either N/A or 15 psig on the U-1 form (line 16). I've seen it across the board with a wide range of shellside and tubeside design...
A question came up regarding a pressure vessel we are manufacturing. I included a sketch below for clarity.
We are supplying vessel #1 (blue) which is installed inside a drum (vessel #2). Vessel #1 carries a U-stamp. It has some piping connected to it which is designed to B31.3, the parts in...
