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zizar
Participant

Join Date: Mar 2008
Posts: 2

Rule of Thumb to Select Gas Compressor

03/12/2008 5:42 AM

Hello,

Can anyone tell me what is the general rule of thumb to select either reciprocating or centrifugal type gas compressor? What will govern the decision mainly; the pressure ratio or mass/volume flow?

I have these conditions; volume flow = 20MMSCFD, suction P = 100psig, discharge P = 400psig, suction T = 104 F, gas is 16 MW, What will be the suitable compressor? I believe this is borderline case?
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Steve S.
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Join Date: Aug 2007
Posts: 1790
Good Answers: 87
#1

Re: Rule of Thumb to Select Gas Compressor

03/12/2008 4:50 PM

I think that flow rate and ratio puts you in a centrifugal for a single machine train. The pressures are no problem for either a centrifugal or a recip, but that is a pretty high flow rate for a recip at that ratio (assuming one machine, if you used multiple recips you could do it.. it would just come down to space and economics).
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zizar
Participant

Join Date: Mar 2008
Posts: 2
#2
In reply to #1

Re: Rule of Thumb to Select Gas Compressor

03/12/2008 10:55 PM

Thank you Steve.

As a general rule, what is the flow threshold to decide centrifugal versus recip machine, if there is any? Thanks.
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Steve S.
Guru

Join Date: Aug 2007
Posts: 1790
Good Answers: 87
#3
In reply to #2

Re: Rule of Thumb to Select Gas Compressor

03/13/2008 1:12 PM

We have a set of envelopes in our selection standard, I just checked your conditions against that.

If you go to the web site of an OEM like Dresser Rand or Mann turbo that makes both, they may have a set of envelopes as well. I a pretty sure I have seen a set of curves on the Mann web site any way.
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Steve S.
Guru

Join Date: Aug 2007
Posts: 1790
Good Answers: 87
#4
In reply to #3

Re: Rule of Thumb to Select Gas Compressor

03/13/2008 4:11 PM

Here is an example of the sort of info you can find on the OEM web sites..

http://www.manturbo.com/en/500/500_productdetail.php?prod=radial
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