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Oil + Air Vacuum Pump

Oil + Air Vacuum Pump

Oil + Air Vacuum Pump

We're looking for a pump that will pump a mixture of 40 scfm of air plus 60 gpm of Dexron III oil, and maintain a 9 inHg vacuum on the pump suction.  Discharge is to an atmospheric storage tank.  We've looked at rotary lobe, gear, and air operated diaphragm pumps, and none seem to be capable of our conditions.  We're scavenging oil out of a compressor bearing housing, and have a lot of air leakage through seals + internal openings.  Can anyone make any suggestions?

RE: Oil + Air Vacuum Pump

You might investigate using a liquid ring vacuum pump with the oil as the liquid.

RE: Oil + Air Vacuum Pump

Do you even need a pump?  With that amount of air flow you could probably blow the oil back to the tank.  This type of scavenging is done on some turbine engine bearing sumps.  It may be viable if you don't require a vacuum in the sump.

RE: Oil + Air Vacuum Pump

Yes, the oil ring or a multi stage centrifugal vacuum pump.

RE: Oil + Air Vacuum Pump

Could you use a venturi? You've got airflow/pressure, but is it enough for an eductor to work?

RE: Oil + Air Vacuum Pump

Thanks for the suggestions.  Our air is starting at atmospheric pressure (leakage into the bearings), so we don't have any air motive force to work with.  We are using a "dry rotary claw" vacuum pump to handle the air leakage, and a Wilden-type pump to handle the oil.  We're running the air-oil stream through a vertical separator vessel and taking oil out the bottom, air out the top.  We have a demister on the vacuum pump discharge.  We'll start up this week, and I'll let you know how it works.

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