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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[Non-text portions of this message have been removed] Received on Thu Dec 23 08:09:00 2004
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