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
If you have received this E-Mail in error please return it to the
sender.
We should be grateful if you would also copy the communication to
postmaster@mitsuibabcock.com then delete the E-Mail and destroy any
copies of it.
It is your responsibility to scan any attachments for viruses.
For further information, visit us at WWW.MITSUIBABCOCK.COM
Yahoo! Groups Sponsor
Get unlimited calls to
U.S./Canada
Yahoo! Groups Links
a.. To visit your group on the web, go to:
http://groups.yahoo.com/group/PipingDesign/
b.. To unsubscribe from this group, send an email to:
PipingDesign-unsubscribe@yahoogroups.com
c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed] Received on Thu Dec 23 08:09:00 2004
This archive was generated by hypermail 2.1.8 : Mon Oct 27 2008 - 20:24:06 EDT