Thanks everyone for the helpful comments.
I'll be looking more closely into the possibility of a pressure spike from the pump, air entrapment, and valve closure.
The pump is centrifugal. 10" discharge pipe, 3000gpm, 12ft/s. There is a downstream check valve, and then a vertical tap off for...
The PSV discharges to a sump - atmospheric pressure.
It lifts during continuous operation.
Additionally: Some people here questioned the effect of nozzle loading on PSV set points. But we've checked fit-up by unbolting the flanges and the piping aligns nicely and bolts together smoothly...
Hi all,
We have an ongoing problem with a relief valve. On the discharge side of a pump (water, ambient temps), we have a relief valve that has repeatedly lifted prematurely. When removed and bench tested, this relief valve will then lift within 1% of the 235psig setpoint. Upon...
