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Reciprocating Relief Valve Scnerio


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#1 Engineer87

Engineer87

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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?.

 

 

 

 

 

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#2 fallah

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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.


#3 Art Montemayor

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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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