Positive Displacement Pump Recomendations
Positive Displacement Pump Recomendations
(OP)
Any thoughts regarding the best type of pump for: Crude oil with a few % solids. The majority of the solids are locked up in an emulsion (roughly 10 to 20%); however some of the large particles (300 microns) are oil wet outside of the emulsion. The majority of the solids are in the 1 to 10 micron size and are tightly locked up in the emulsion.
I need a reliable, low shear, positive displacement pump. Rate would be around 25 gpm at 200 psig.
Any suggestions or articles that would help me determine the best type of pump for this service would be appreciated.
My initial thought is to look into a progressive cavity pump.
I need a reliable, low shear, positive displacement pump. Rate would be around 25 gpm at 200 psig.
Any suggestions or articles that would help me determine the best type of pump for this service would be appreciated.
My initial thought is to look into a progressive cavity pump.





RE: Positive Displacement Pump Recomendations
These units are great for crude oil services, and in fact are used for things like Orimulsion, the bitumen emulsion fuel that was coming out of Venezuela.
In your application, you may want to run aroud 120 rpm, you're probably looking at 5-10 hp, so that's not too big.
RE: Positive Displacement Pump Recomendations
CRG: take a look to this article, it can help you ww
RE: Positive Displacement Pump Recomendations
RE: Positive Displacement Pump Recomendations
David
David Simpson, PE
MuleShoe Engineering
www.muleshoe-eng.com
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RE: Positive Displacement Pump Recomendations
RE: Positive Displacement Pump Recomendations
RE: Positive Displacement Pump Recomendations
Ted
RE: Positive Displacement Pump Recomendations
Try this company www.kawa-pump.co.jp They may have sales outside Japan."
These are commonly called hose-pumps and could prove ideal for your aplication and available from a number of manufacturers.
RE: Positive Displacement Pump Recomendations
Hose pump is the first one I thought, but you'll have to replace the hose a couple of times minumum in a year if the pump is continuous running.
Rotary lobe can also be used for slurry application. The bad point is, you may have to ask the vendor to visit your site if you got problem with the seals or other components. Some maintenance can only be done by the manufacturer.
Progressive cavity does have low shear as indicated by Zdas04. It generates continuous flow. Actually I do not get a reason why you should not use it except for its relatively high cost and large footprint.
RE: Positive Displacement Pump Recomendations
Thank you all for your advice.
CRG
RE: Positive Displacement Pump Recomendations
Low shear, low NPSHr, low pulsation, insensitive to viscosity, easily able to handle the flows/pressures discussed and reasonably tolerant of entrained solids/abrasives (we sometimes use them to pump things like dewatered sewage sludge and chicken carcasses!).
The main point to beware of, as already mentioned will be the selection of the correct elastomer for the stator, especially if the crude is warm or hot.
RE: Positive Displacement Pump Recomendations
A progressing cavity will work in this service but be prepared for maintenance hassles. They do not like to run dry, at all, and they do not like sand despite what anybody says. Even outfitted with special materials and special clearances, they will see high MTBF. Oil patch operators tend to have a tough time with these pumps. In my opinion and experience the PC pump is the 2nd choice behind the recip pump.
Same goes for gear pumps. The solids will eat them alive. I once retrofitted two Viking pumps with a singe duplex Gaso. The Vikings were failing about once every two weeks. The sand destroys the internal clearances.
Hope this helps!