Pumping Bingham Plastics

From: <James>
Date: Thu Dec 23 2004 - 06:22:00 EST

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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For further information, visit us at WWW.MITSUIBABCOCK.COM Received on Thu Dec 23 06:22:00 2004