Re: [PipingDesign] Pump selection

From: <Chicago>
Date: Thu Dec 02 2004 - 18:51:00 EST

Yes, I am looking into Gould 3796. An Initial positive response on Gorman-Rupp U3B65-B from the vendor has tapered off due to limitations. Have you or anybody else have heard about self priming pumps from RS Corcoran ? ----- Original Message -----

   From: Jacques Chaurette
   To: PipingDesign@yahoogroups.com
   Sent: Thursday, December 02, 2004 4:50 PM    Subject: Re: [PipingDesign] Pump selection

   Now that we have the vapor pressure sorted out this does not seem like too difficult an application. It seems to me that a self-priming centrifugal pump by Gorman-Rupp or Goulds will do the job, they don`t normally come with these types of seals but maybe they can be installed.

   Jacques

     Yes, you are right. It is 2 psia. Not 2 psig.
       ----- Original Message -----
       From: Jacques Chaurette
       To: PipingDesign@yahoogroups.com
       Sent: Thursday, December 02, 2004 2:19 PM
       Subject: Re: [PipingDesign] Pump selection


       You said 2 psig at 80F, not the same.

       Jacques

         ----- Original Message -----
         From: Chicago
         To: PipingDesign@yahoogroups.com
         Sent: Thursday, December 02, 2004 11:35 AM
         Subject: Re: [PipingDesign] Pump selection



         The liquid is a mixture of Benzene (80%), Xylene and Toulene. The stated
boiling temperature of the mixture at 14.7 psia is 170 F. The vapor pressure of 2 psia at 80 F is only a derived number from a vendor. As a VOC the liquid is required to be stored under a nominal blanket of 5 in WC.

         Thank you for your interest.

           I think there is something missing here. Are you sure that the vapor pressure is 2 psig, this is extremely high, what kind of liquid is it, with a vapor pressure like that when the liquid is open to atmosphere then it will completely evaporate, there will be nothing left to pump. If the vapor pressure is correct, then you need to have this liquid under pressure which is a data that you have not given.

           Jacques

             I am trying to find a suitable pump for a rather complex
             application. The pump needs to be self priming as it has a lift of
             14 feet. At 100 GPM I expect the total head to be 150 feet. It needs
             to handle solids atleast 1/4 inch size, the vapor pressure of the
             pump liquid is about 2 psig at 80 F which really cuts down on the
             NPSH. And on top of it it would handle a VOC subject to NESHAP
             requirements- meaning sealless or double seal pumps. I have already
             rejected diaphragm type pump because of pulsations.
             Any suggestions, generic or otherwise ?








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[Non-text portions of this message have been removed] Received on Thu Dec 02 18:51:00 2004

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