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Reciprocating Compressor Suction Pressure And Flow

reciprocating compressor flow suction pressure flow rate compressor

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#1 rs20170808@gmail.com

rs20170808@gmail.com

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Posted 15 April 2019 - 01:34 PM

Hello All, 

 

I have seen from some compressor performance runs from Ariel that at low suction pressure we have low flowrate (in MMSCFD) that a compressor can do...and at high suction pressure we have higher flow rate. What is the basic reasoning behind this? 

 

If a compressor can do say, 6 MMSCFD at 30 PSIG suction pressure, can it do 4 MMSCFD at 30 PSIG suction pressure also?  Considering discharge pr. is same?

 

If a compressor can do say, 5 MMSCFD at 60 PSIG suction pressure, can it do 5 MMSCFD at 30 PSIG suction pressure also? Considering discharge pr. is same?



#2 Pilesar

Pilesar

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Posted 15 April 2019 - 03:28 PM

Consider reciprocating compressors constant volume rate movers. Volume rate times the density gives mass flow rate. At higher suction pressure, the density is higher and therefore the mass flow rate is higher for the same constant volume rate. Although the units MMSCFD have 'cubic feet' in them, this really should be thought of as a mass flowrate since it can be converted to mass as a function of molecular weight.






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