RE: [Fwd: queries on compressor]

From: <Arif>
Date: Thu Nov 17 2005 - 02:41:00 EST


The amperes no load compressor and fully loaded compressors are remarkably different hence there is considerable power saving. I would disagree that it actually consumes the same power in both conditions.

AJ

Qatar.

From: <a href="/group/PipingDesign/post?postID=NlP2fZCVJ57KOFCCysvFDWn9R-BrntovZ4kUm2P1JXCEt_QBSxLAevxG3H81FSA9MrrOSOVpI2E8ZavMnNSmvCbI5w">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=NlP2fZCVJ57KOFCCysvFDWn9R-BrntovZ4kUm2P1JXCEt_QBSxLAevxG3H81FSA9MrrOSOVpI2E8ZavMnNSmvCbI5w">PipingDesign@yahoogroups.com</a>] On Behalf Of David G. Eastwood
Sent: 17 November 2005 00:29
To: <a href="/group/PipingDesign/post?postID=NlP2fZCVJ57KOFCCysvFDWn9R-BrntovZ4kUm2P1JXCEt_QBSxLAevxG3H81FSA9MrrOSOVpI2E8ZavMnNSmvCbI5w">PipingDesign@yahoogroups.com</a> Subject: RE: [PipingDesign] [Fwd: queries on compressor]

Refer to Skip Foreman's technical paper available at
<a href="http://www.dresser-rand.com/e-tech/recip.asp,">http://www.dresser-rand.com/e-tech/recip.asp,</a> particularly the section
on
unloaders and clearance pockets.

Compressor design usually needs to account for multiple design conditions and this is achieved by designing fixed clearances, optimising valve design, unloaders, pulsation dampners and multi-staging for efficiency when appropriate.

Variable flows are accommodated by using unloaders, bypass lines (wasteful, but cheaper initial outlay), clearance pockets and very occasionally using variable speed motors (expensive).

The power consumption varies with operating conditions and is not constant as you imply.

Regards
David Eastwood

-----Original Message-----
From: <a href="/group/PipingDesign/post?postID=NlP2fZCVJ57KOFCCysvFDWn9R-BrntovZ4kUm2P1JXCEt_QBSxLAevxG3H81FSA9MrrOSOVpI2E8ZavMnNSmvCbI5w">PipingDesign@yahoogroups.com</a> [mailto:<a href="/group/PipingDesign/post?postID=NlP2fZCVJ57KOFCCysvFDWn9R-BrntovZ4kUm2P1JXCEt_QBSxLAevxG3H81FSA9MrrOSOVpI2E8ZavMnNSmvCbI5w">PipingDesign@yahoogroups.com</a>] On Behalf Of Paul Bowers
Sent: Saturday, November 12, 2005 3:56 PM To: <a href="/group/PipingDesign/post?postID=NlP2fZCVJ57KOFCCysvFDWn9R-BrntovZ4kUm2P1JXCEt_QBSxLAevxG3H81FSA9MrrOSOVpI2E8ZavMnNSmvCbI5w">PipingDesign@yahoogroups.com</a> Subject: [PipingDesign] [Fwd: queries on compressor]

Sir, 

     I had a question :
      when we operate Reciprocating compressors we are either operating
at a certain fixed motor RPM. This allows for the rated capacity of Compressor.
But if the demand flow rate is required in less quantity i.e. under part-load conditions it doesn't change the RPM accordingly so as to adjust to the desired flow rate. Hence it actually consumes the same power under low-load conditions as the peak-load conditions.

So, can we apply some VFD's for such systems which can adjust accordigly as the desired flow rate so that automatically RPM's vary and power consumed is comparatively less under part-load conditions.

Regards,
Anindya Mazumdar
Maxpro Department
United Phosphorus Limited
Unit-1,GIDC ,Ankleshwar


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[Non-text portions of this message have been removed] Received on Thu Nov 17 02:41:00 2005

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