RE: Pump selection

From: <Pankaj.Mandal@fluor.com>
Date: Fri Dec 03 2004 - 07:43:00 EST


Bungartz pumps are special vertical pumps where the pump itself do not go down into a shaft. It is located above the ground (like a vertical in-line pump), thus saving the cost of excavation etc.

We have had successful installation of such pumps in situations where available NPSH is very low. You may go thru their web-site (as mentioned in my previous mail) for details.

Pankaj.

"Steve McKenzie" <mechproj@xtra.co.nz> 12/03/04 04:46 PM
Please respond to PipingDesign 

         To:     <PipingDesign@yahoogroups.com>
         cc:
         Subject:        RE: [PipingDesign] Pump selection
.

Me neither, but I don't know much about pump brands.

However it may be worth designing and building your own priming station. On more specialised applications, it can be cheaper. If it is at all possible to put the pump down the (a) hole by using a pedestal pump, as Pankaj suggests, then that is often the best solution as NPSH uncertainties are reduced along with seal issues. I assume you are not extraction/subatmos pumping. The only special things to watch are bearing lube arrangements, shaft thrust issues, erosion/tip speed, servicing and foundations. Cant understand why you consider the pulsations from a diaphragm pump an issue. Please explain.

Cheers

Steve

-----Original Message-----
From: Jacques Chaurette [mailto:jchaurette@fluidedesign.com] Sent: Friday, December 03, 2004 2:50 PM
To: <a href="/group/PipingDesign/post?postID=dCr2O6EdISwdmSlvZg29JS3kRJKSKwIOMY7PHlwei3FaOoelyy0vo4yy2RW8BPfLEwPSeWybkxvTWYNq13hwa_nuFXMpBFc">PipingDesign@yahoogroups.com</a> Subject: Re: [PipingDesign] Pump selection

No, I have never heard of them.

Jacques

   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 ?

     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: <a href="/group/PipingDesign/post?postID=dCr2O6EdISwdmSlvZg29JS3kRJKSKwIOMY7PHlwei3FaOoelyy0vo4yy2RW8BPfLEwPSeWybkxvTWYNq13hwa_nuFXMpBFc">PipingDesign@yahoogroups.com</a>
         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: <a href="/group/PipingDesign/post?postID=dCr2O6EdISwdmSlvZg29JS3kRJKSKwIOMY7PHlwei3FaOoelyy0vo4yy2RW8BPfLEwPSeWybkxvTWYNq13hwa_nuFXMpBFc">PipingDesign@yahoogroups.com</a>
           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 Fri Dec 03 07:43:00 2004

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