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lashsd
Active Contributor

Join Date: Mar 2008
Posts: 11
Good Answers: 2

Type of Pump to be Used

06/19/2010 3:38 AM

We have replaced neat cutting oil by an water based emulsion in a gun drilling operation.

The cutting oil having a viscosity of 14 cSt was pumped using a vane pump giving 100 lpm @ 100 bar pressure.

With emulsion ( 2 cSt) the the pump pressure dropped to 60 bar initially. After 2 months of operation max pressure now developed is 40 bar.

Is the pump wearing down?

What type of pump should be ideally used for such application?
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user-deleted-1105
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Popular Science - Weaponology - New Member United Kingdom - Member - New Member

Join Date: May 2007
Location: Harlow England
Posts: 16512
Good Answers: 670
#1

Re: Type of pump to be used

06/19/2010 4:15 AM

Is the oild viscosity increasing, or decreasing? Filters getting clogged?
I assume the oil is recirculated...
Does it matter? What is actually important? Probably the flow rate...
Del

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mike k
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Hobbies - DIY Welding - New Member

Join Date: Apr 2008
Location: Bristol, Tennessee
Posts: 1177
Good Answers: 58
#2

Re: Type of Pump to be Used

06/25/2010 11:51 PM

Your cutting fluid is probably deteriorating, losing it's lube properties. Try fresh fluid, although your pump is probably trashed from wear. For pumping water based coolant, plenty of additive must be kept in the mix, good filtration, and change the coolant now and then. It probably gets funky with bacteria anyway, which is hazardous.

Few pumps can compare with a good vane pump for service, but you must filter out abrasives, and provide some lubrication.

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