Compressor Discharge PSV Set Pressure Basis
Compressor Discharge PSV Set Pressure Basis
(OP)
I have a PSV on the discharge side of a reciprocating compressor. The set pressure of the PSV ensures piping and compressor cylinder design pressure limits are not breached. However, if the PSV lifts then rod loads will be exceeded due to the higher compression ratio and compressor motor power will also be exceeded.
In addition to limiting discharge pressure to below design pressure, should i be considering lowering the PSV set pressure to also avoid exceeding:
1) rod load limits
2) electric motor rating
Thanks.
In addition to limiting discharge pressure to below design pressure, should i be considering lowering the PSV set pressure to also avoid exceeding:
1) rod load limits
2) electric motor rating
Thanks.





RE: Compressor Discharge PSV Set Pressure Basis
design safety factors of your piping and compressor cylinder. Also, your electric motor may/should have it's own overload protection. Just some things to think about.
Good luck,
Latexman
Technically, the glass is always full - 1/2 air and 1/2 water.
RE: Compressor Discharge PSV Set Pressure Basis
If you were approaching rod load at normal operating pressure (call it 70% of MAWP), then you would definitely be in rod load when the PSV goes off, but that is a fact of the magnitude of discharge pressure not PSV setting.
David Simpson, PE
MuleShoe Engineering
Law is the common force organized to act as an obstacle of injustice Frédéric Bastiat