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=BQgEDL3lw6fAvUuftd8pOl3AKPFY0bBgHzdX9p9Q8Sj0ySWSiKcOUjLzcwtSFi7g0HQJcy376mxjetdBVkfzecdACw">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=BQgEDL3lw6fAvUuftd8pOl3AKPFY0bBgHzdX9p9Q8Sj0ySWSiKcOUjLzcwtSFi7g0HQJcy376mxjetdBVkfzecdACw">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=BQgEDL3lw6fAvUuftd8pOl3AKPFY0bBgHzdX9p9Q8Sj0ySWSiKcOUjLzcwtSFi7g0HQJcy376mxjetdBVkfzecdACw">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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Yahoo! Groups Links Received on Fri Dec 03 06:16:00 2004
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