Hi,
I have a relief valve installed at the suction side of reciprocating compressor.I'm just wondering if relief valves are sized in this case are for blocked flow/accumulation taking 10% overpressure margin above the set pressure?.
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Posted 25 June 2014 - 01:54 PM
Hi,
I have a relief valve installed at the suction side of reciprocating compressor.I'm just wondering if relief valves are sized in this case are for blocked flow/accumulation taking 10% overpressure margin above the set pressure?.
Posted 25 June 2014 - 02:02 PM
Hi,
The over pressure for the scenarios other than fire case is to be 10% above the PSV set pressure. Your query isn't so clear...Please clarify a bit more...
Edited by fallah, 25 June 2014 - 02:13 PM.
Posted 25 June 2014 - 02:05 PM
Engineer87:
You fail to state what the set pressure is for the subject PSV or the design pressure of the suction drum on the compressor. Those are critical values.
I suspect that you have a very positive design suction pressure on your reciprocating compressor – above 15 psig. If that is correct, then you must have a PSV on the suction drum since it obviously is considered a pressure vessel and the ASME code mandates it.
Blocked flow for a reciprocating compressor means the compressor is shut down. The source of your suction gas should be regulated or controlled and you don’t identify it. It is not normal to have a suction PSV on a compressor unless you have a pressure vessel in front of it – as explained above. Please give us all your basic data – like fluid, flow rates, pressures, MAWP, temperatures, etc. Then we have a more accurate and clearer picture of what you have.
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