Min vol of vessel to require PSV ?
Min vol of vessel to require PSV ?
(OP)
Dear sirs,
I recall guidenace on min vessel volumes that require a PSV.. but now can i find it no.. is it in API or the pressure vessel codes? and what defines it.. i assume is an engineering judgement.. eg when the equipment is not much bigger than pipe..
I recall guidenace on min vessel volumes that require a PSV.. but now can i find it no.. is it in API or the pressure vessel codes? and what defines it.. i assume is an engineering judgement.. eg when the equipment is not much bigger than pipe..





RE: Min vol of vessel to require PSV ?
You can protect multiple vessels with a single relief device if they are connected by pipe of adequate size with no valves in the line.
Even sub-ASME devices which walk and talk like a vessel and have relief cases which cannot discounted, need protection via a relief device. Even a 500 mL laboratory reactor pressure "vessel", which is far too small for ASME VIII to apply, needs a relief device (generally a rupture disc is used).
RE: Min vol of vessel to require PSV ?
Good luck,
Latexman
RE: Min vol of vessel to require PSV ?
RE: Min vol of vessel to require PSV ?
PIP VESSM001 does not speak to PSV requirements.
Good luck,
Latexman
RE: Min vol of vessel to require PSV ?
If i have
> Vessel design P 20 Barg.
> Pipework design P 10 barg.
RV on the vessel has to be 10 barg or can it be 20 barg ?
if i did not have a vessel in the system i would not have an RV.. so why can i not use 20 barg..
but it seems wrong.
RE: Min vol of vessel to require PSV ?
In this scenario, I usually look for the lowest MAWP in continuous contact (not including piping downstream of a pressure regulator) and set the PSV to protect that. I hate it when people rely on pipe failing to prevent a PSV from lifting.
David
RE: Min vol of vessel to require PSV ?
I 100% endorse and feel the same way about
any pipeline segment serving as passage of relieved material
to safeguard any vessel's/containment's mechanical integrity.
Best Regards
Qalander(Chem)
RE: Min vol of vessel to require PSV ?
Either your piping has the same or higher design pressure than the vessel it is connected to such that the code-required protection on the vessel is also protective of the piping, or the piping needs separate relief- or there is some other protective scenario at play in the design.
RE: Min vol of vessel to require PSV ?
Best Regards
Qalander(Chem)
RE: Min vol of vessel to require PSV ?
As for safety relief devices; Will your CFO and/or insurance carrier have a problem with a medium to huge bomb complete with shrapnel? [scarcasm off] Anything that can be isolated with valves needs a pressure relief device. For most items, there is a Code that requires that device. Just because you can't/didn't find a Code requirement, it doesn't mean that protection is not required or prudent.
ASME Code became law [in the 1930's?] because too many people got tired of explosions and carnage.
RE: Min vol of vessel to require PSV ?
thankyou for your information very helpful
RE: Min vol of vessel to require PSV ?
An exception can be made if a surplus vessel, with a high MAWP, is retrofitted into a lower MAWP system. In such cases, the PSV needs to be set at the design pressure of that system and not at the MAWP of the vessel.