When is a safety valve required on an air reciver
When is a safety valve required on an air reciver
(OP)
We have a remote, out door, compressed air vessel. This vessel can not be over pressured from the air source.
Is fire the only reason to have a safety valve on the vessel? Is this an ASME requirement? What would be enough of a fire risk to require a valve?
How to size the valve for fire?
Is fire the only reason to have a safety valve on the vessel? Is this an ASME requirement? What would be enough of a fire risk to require a valve?
How to size the valve for fire?





RE: When is a safety valve required on an air reciver
Hmmm, I've heard that before, but this usually implies either a high tech redundant shutdown system or a relief valve somewhere on the pressure source? Has it gone through a HAZOP and LOPA assessment.
If you've got buy in from everyone on that then yes, fire is your key issue.
To prevent against fire needs a credible fire scenario to arise. If there isn't one then you have no fire risk.
But why do all this for a relief valve on an air tank??
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: When is a safety valve required on an air reciver
Murphy's Law of Equipment Installations = What cannot go wrong will go wrong.
RE: When is a safety valve required on an air reciver
The device setpoint is specified as the maximum allowable operating pressure (design pressure) for the vessel
Most other international codes are similar .... What doe your local building code authority require ?
Consider posting on the "Safety and Relief valve" forum
MJCronin
Sr. Process Engineer
RE: When is a safety valve required on an air reciver
The receiver is feed from another receiver with safety valves. So that source can not over pressure our vessel.
We are now being asked to look at the fire case. The vessel is located on a gravel outdoor site. No source of fuel (process is water and steam) unless the weeds grow.
To put this is prospective, the vessel is not much different the valve pneumatic actuators near by.
RE: When is a safety valve required on an air reciver
you should know by now it's the details we need....
This sounds like a pneumatic accumulator on the end of a pneumatic system to allow valve operation without flattening the system and hence a fairly low volume which probably takes it out of Pressure Vessel regulations.
What volume and pressure are we talking about?
But Fire case - No source of fire, no need for fire pressure relief.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: When is a safety valve required on an air reciver
That relief device can be either dedicated to the vessel itself, or it can be shared with other vessels of the same MAWP or lower that it is connected to by pipe, of adequate size, and without valves which can be closed or a fluid which can freeze etc. which would thereby defeat the pressure relief protection of the vessel. Typically, valves which are locked or car sealed in the open position may be permitted in the interconnecting lines after a HAZOP review.
That's the way I read and interpret ASME VIII-1. If others disagree, and can quote chapter and verse from either ASME VIII or API 520/521 that says otherwise, I will be happy to stand corrected.
RE: When is a safety valve required on an air reciver
Is there some language I'm missing within the 2010 or later editions that still requires a relief device regardless of circumstance even if the requirements of UG-140 are met? I'd be interested in whether or not I'm misunderstanding something or missed some language elsewhere that says otherwise.
Thanks,
Ehzin
RE: When is a safety valve required on an air reciver
RE: When is a safety valve required on an air reciver
RE: When is a safety valve required on an air reciver
consult your local fire chief and fire Codes to asses fire safety. If you want to instal an alternate safety for fire, you can probably use a Fuse Plug, the same that are used on Boilers.
General Blr. CA,USA