Re: Fw: CO2 Compressor

From: <Gordon.Reddek@Alcan.com>
Date: Sun Mar 28 2004 - 17:39:00 EST

I have heard of one compressor that always tripped on overtemperature because the operators did not understand the effect of recirculation. There was a by-pass around the compressor, and the operators incorrectly believed that if the discharge temperature was high they had to increase the by-pass. What they did not understand was that each time the gas passes through the compressor it picked up energy so increased by-pass aggravated the situation. The problem was solved by opening the by-pass wide.
Regards,

Gordon Reddek

"Paul Bowers" <pbowers@pipingdesign.com> 28/03/2004 07:13 AM
Please respond to PipingDesign

         To:     <PipingDesign@yahoogroups.com>
         cc:
         Subject:        Fw: [PipingDesign] CO2 Compressor

From Robert Poirier of
www.ropoirier.com (still under construction)

> I think i know what is the problem
>
> If compressor is a multi-stage piston compressor, If the the
compressor
> trip on high dicharge temperature (mandatory on all compressor) after
a few
> 10 minutes of operation the problem could be one of the following
>
> 1- not sufficent cooling water circulation in the intercooler or
intercooler
> is durty with silk (commond problem with water comming from
evaporative
> cooling tower).
>
> On next start up of compressor check, temperature of CO gas at the
> intercooler outlet and dischage of water temperature. If both are
gradualy
> increasing until shut down of compressor, you got the nature of
problem. See
> if you can increase water flow to the intercooler or clean the
intercooler.
>
> 2 Trip on high discharge temperature or overload of themotor. the
inlet
> pressure of CO gaz at the compressor decrease gradualy. this would
increase
> the compression ratio of the compressor, the amperage of motor would
> increase and the dicharge temperature of all stages.
>
> As Gordon mention, with more information we can determine the nature
of the
> problem and do the necessairy correction.
>
> Robert
>
> Robert Poirier, ing.
>
> R. O. Poirier inc
> 3341 félix-Leclerc
> Vaudreuil-Dorion, Québec
> J7V 8W5
> Tel: (514) 990-3599
> Fax: (450) 455-3470

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[Non-text portions of this message have been removed] Received on Sun Mar 28 17:39:00 2004