Gear pump pressure ?

Collecting, filtering and dewatering of WVO SVO vegetable oil. For Biodiesel producers too.

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Postby powerstroke73L » Mon Nov 17, 2008 2:05 pm

I have the same pump newtoveggie is using paired with my Dieselcraft 0C-20. I used to let my oil get up above 180 degrees which I believe damaged the seals as the pump now seeps oil under pressure. As a stopgap the pump now sits inside a large turkey pan, but I'm thinking of replacing it with this hydraulic pump (second from the top-part # 6296K52):

http://www.mcmaster.com/#catalog/114/986
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Postby newtoveggie » Mon Nov 24, 2008 7:48 am

Getting Closer.

John from dieselcraft was good enough to send me out a new rotor and base thinking this may cure my problem. Not so.
The gear pump I use has steel spurs. The oil I ran through a few weeks back was loaded with water and I think this may have damaged the gear pump ( it actually says don't use water in the instructions - duh). Would damage from water lead to lower volumes of oil flow? Symptoms: When I close off enough valves the pressure will climb over 100 PSI but when I run the CF (bypass closed) the pressure won't get above 70 PSI. Before this watery batch I would close the bypass halfway and achieve 90 PSI easy.
Are your gears steel?
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Postby SunWizard » Mon Nov 24, 2008 8:46 am

Yes my gears are steel. Yes if you ran 100% water through it you can damage it. A water/VO blend would probably not damage it since VO has such good lubricity. The main problem is your pump is too small.
YVORMV - Your veg. oil results may vary.
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Postby powerstroke73L » Mon Nov 24, 2008 12:37 pm

SunWizard wrote:Yes my gears are steel. Yes if you ran 100% water through it you can damage it. A water/VO blend would probably not damage it since VO has such good lubricity. The main problem is your pump is too small.


Actually it's too big. I have the same pump and produces somewhere in the neighborhood of 1.1 GPM at 90 psi (its rated at 1.3 GPM/80 psi and 1 GPM 100 psi), so there is always a fair amount of bypass. That's why I have been looking into the hydraulic pump above. It displaces .129 cu inches per revolution which, when attached to a 1725 RPM motor would yield 222.5 cubic inches per minute. 222.5 cubic inches = .96 gallons per minute. I'll keep everyone posted.
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Postby newtoveggie » Mon Dec 01, 2008 7:48 pm

Final Update:

The watery batch put grooves in the CF shaft throwing it out of tolerance and ruining the steel spurs on the gear pump. I returned the pump to grainger and upgraded to a bronze pump so this won't happen in the future. Although in the future you know I will be able to spot a watery batch. This put me out of commission for three weeks so I am just now catching up on the backlog of dirty oil in my garage. Thank You to all who contributed to my dilemma.
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