We have a PSV that has been popping
We have a PSV that has been popping
(OP)
We have a PSV that has been popping. It is just downstream of a centrifugal compressor. I wonder if installing a dampener ahead of the relief valve might eliminate some of the pressure spiking. I have used these on reciprocating compressors routinely, but never thought of using after a centrifugal compressor.
Any thoughts?
Any thoughts?





RE: We have a PSV that has been popping
RE: We have a PSV that has been popping
a) The max operating discharge pressure is too close to the setpoint of the PSV
b) Some mechanical defect on the PSV or poor calibration of the PSV
c) The setting of the recycle PIC setpoint on this compressor has been altered recently or this PIC loop is too slow to handle the discharge pressure swings.
RE: We have a PSV that has been popping
Per ISO, only the term Safety Valve is used regardless of application or design.
RE: We have a PSV that has been popping
RE: We have a PSV that has been popping
RE: We have a PSV that has been popping
Per ISO, only the term Safety Valve is used regardless of application or design.
RE: We have a PSV that has been popping
mk3223 - This RV is on the second stage of a syngas compressor system. There is no intermediate separator. I don't think a full sized tank is in the cards; that is why I asked about the dampener vessel.
George - This is indeed a centrifugal compressor, 2nd stage. The operating pressure runs about 90% of the RV set point. The RV is a POSRV assumed to be able to handle 95% operating ratio. We believe the relief valve is mechanically sound (actually we have rotated a spare). Once running, the system doesn't experience large operating extremes, but your question on the PIC control is valid, since the recycle is done from the final stage. Yes, the dampener was meant to include consideration of a (smaller) tank.
avalveman and dcasto - The relief valve is an Anderson Greenwood 25312 POSRV. I am checking to see if a snubber is installed; if not, this is worth pursuing.
RE: We have a PSV that has been popping
Have you given any thought to adding a Rupture Disc under the PSV Inlet?
Sometimes its possible to do all the right things and still get bad results
RE: We have a PSV that has been popping
If this is the 2nd stage out of 3 then where is this pressure spike coming from that doesn't affect the other stages?
Can you put some numbers down here
Design pressure
Set pressure of the RV
Operating pressure of the system
Level of the pressure spike (if known)
Duration of event,
number per day?
Design code of the system
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: We have a PSV that has been popping
RE: We have a PSV that has been popping