Section VIII Safety Valves
Section VIII Safety Valves
(OP)
Hello All,
My company makes jacketed pressure vessels where the jacket and inner chamber are filled with steam. One of our designs takes steam from the jacket and uses that as the steam source for the inner chamber. This is the only source of pressure for the inner chamber. The jacket is rated for 45 PSIG internal and the chamber is rated for 45 PSIG external and 30 PSIG internal. Can we install one safety valve on the jacket and not have one on the inner chamber? The argument is if the jacket safety is set to 30 PSIG and the jacket is the only source of pressure then the chamber is inherently already protected. As always, thank you for the help!
Best,
Steris
My company makes jacketed pressure vessels where the jacket and inner chamber are filled with steam. One of our designs takes steam from the jacket and uses that as the steam source for the inner chamber. This is the only source of pressure for the inner chamber. The jacket is rated for 45 PSIG internal and the chamber is rated for 45 PSIG external and 30 PSIG internal. Can we install one safety valve on the jacket and not have one on the inner chamber? The argument is if the jacket safety is set to 30 PSIG and the jacket is the only source of pressure then the chamber is inherently already protected. As always, thank you for the help!
Best,
Steris





RE: Section VIII Safety Valves
Patricia Lougheed
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RE: Section VIII Safety Valves
RE: Section VIII Safety Valves
RE: Section VIII Safety Valves
RE: Section VIII Safety Valves
RE: Section VIII Safety Valves
I completely understand the arguments and the intention of the code. What I don't understand is that a few of our competitors use only one safety and I'm not sure how they are able to get away with it. Their process flow and piping is roughly the same as ours. I feel like there is an exception somewhere but I don't know where.
Thanks again!
-Steris
RE: Section VIII Safety Valves
I think I found what I was looking for. There is an exception in Appendix M-5.5 as allowed by UG-125(g) & UG-135(d)(2). I hope that is able to help someone else. Thanks again for all your help!
Best,
Steris