Do a search on Peristaltic Pumps, especially looking into Thomas
Register (at http://www2.thomasregister.com/) and you will find several
mfrs of the pumps. Each has his own specialty service, pumping range,
etc. They do not, by their nature, have the ability to draw much
suction, but can do some (perhaps a meter or 2 of water column)
Merry Christmas, Happy new year, and all that!
... Bruce D. Bullough ...
Sebesta Blomberg & Associates, Inc.
2381 Rosegate
Roseville, MN 55113 USA
+ 651-634-7344
www.sebesta.com
-----Original Message-----
From: George McKinney [mailto:gmckinney@augustaeng.com]
Sent: Thursday, December 23, 2004 7:09 AM
To: <a href="/group/PipingDesign/post?postID=YJFb_qZQn4nUXVdZwVLFfESBpTPUiz3QDILeEdoqmBy9L8lcNWv-jha8okUYLrTDWommwH-k2oXga-k8mNNvRhoLoeZrz8M">PipingDesign@yahoogroups.com</a>
Subject: Re: [PipingDesign] Pumping Bingham Plastics
[bcc][faked-from][mx][spf]
Barbara:
There is one type of pump, essentially progressive cavity, which uses a
flexible hose in a semi-circular cage, with a rotating roller mechanism
to do the pumping. Very tolerant of solids/sludge, and the flex hose
pumping cavity is simple to replace so contamination is not a problem.
On the negative side, they need a flooded suction, will not pull much of
a vacuum. But for what you describe, might be just the thing.
Problem is, I don't remember the manufacturer (Alzheimer's - the real driver behind Google).
George McKinney
Steve (+ Gents + the other 1)
I was wondering how you got on with the baby poo pumping problem that you posted to the list in August? What sort of pump did you end up going along with? Is it working well?
I have a similar sort of problem; pumping contaminated sludge (10% solids in water) over 250m. The sludge has formed at the bottom of a large pond which is to be completely emptied. I don't have details of density, viscosity etc.
Most important consideration here is total reliability of the pump as it
won't be possible to change out parts that have been in contact with the
process fluid.
The sludge could contain solids up to 6mm diamter, so the pump will have
to be something very robust. I was thinking of a positive displacement
progressive cavity pump or possibly an eductor.
The client already has eductors in use, the lack of moving parts is a very attractive feature and the client does like to stick with familiar
technology. But, I am not sure that there will be sufficient steam available and the client is not keen to use large quantities of demin water due to the issue of decontaminating it after it has been in contact with the sludge.
The positive displacement progressive cavity pump is widely used in the
sewage industry and the manufacturer's claim that they are tolerant of entrained solids. They certainly look simple enough and don't require an additional motive fluid.
The project is in very early stage and I have been asked to come up with
a high level document to outline the options. Detail design of pumps will be done by a real pumping expert.
Can anyone suggest alternative pumps types that are known to work well for this sort of duty?
I know to keep the pipe route as straight as possible, avoid low points
and use large radius bends but does anyone have other useful tips for pumpimg sludges and slurries?
Barbara
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