CarlosEstinos
Mechanical
Hello All,
I'm conducting a back-pressure test on a PSV fitted with bellows, testing at 30psi (air) as per ASME Viii.
The valve manufacturer tag plate shows the set pressure of the valve, but also the back pressure, in this case 22psi for the latter. I’m assuming that the back pressure stated on the tag plate means the test pressure, but it’s not something I usually see on a tag plate. The stated back pressure could also imply that it has been sized for an application with 1.5bar back pressure, either built up or superimposed.
ASME Viii states that the minimum test pressure for the second cavity of the PSV should be 30psi. Is that test pressure sensible based on the fact the tag plate shows 22psi for back pressure (this could be for sizing applications or the manufactures test limit for their bellows).
It’s a small testing anomaly, but bellows are quite fragile so I don’t want to kill them!
Any insight on this would be much appreciated.
Thanks in advance
I'm conducting a back-pressure test on a PSV fitted with bellows, testing at 30psi (air) as per ASME Viii.
The valve manufacturer tag plate shows the set pressure of the valve, but also the back pressure, in this case 22psi for the latter. I’m assuming that the back pressure stated on the tag plate means the test pressure, but it’s not something I usually see on a tag plate. The stated back pressure could also imply that it has been sized for an application with 1.5bar back pressure, either built up or superimposed.
ASME Viii states that the minimum test pressure for the second cavity of the PSV should be 30psi. Is that test pressure sensible based on the fact the tag plate shows 22psi for back pressure (this could be for sizing applications or the manufactures test limit for their bellows).
It’s a small testing anomaly, but bellows are quite fragile so I don’t want to kill them!
Any insight on this would be much appreciated.
Thanks in advance
