Typical Feed Rates for the US Filtermaxx Open Bowl Centrifuge

Product Flow Rate (GPH)
Biodiesel - finished product 40
Diesel Polishing1 40
WVO  Cleaning for biodiesel 25
WVO  Cleaning for fuel 15-20
WMO Cleaning for fuel 10-20
Transmission fluid 15-25
Lube oil for reuse2 8-12
Hydraulic oil for reuse 10-25

Feed rates may be higher or lower depending upon contamination and viscosity of the oil.
¹Free water drained before centrifuging
²Blended with new oil

All oils must have free water drained before centrifuging. If you put water in, you will get centrifuged water out. Centrifuge does not convert water to oil.


“brown or milky oil” requires 200+F and slower feed rates to break emulsions. Emulsions may also be broken by blending with 15% gasoline and settling for two weeks.

Reusing Crankcase Oil

Crankcase oils for reuse are best cleaned at 6000 G. Crankcase oils see about a 6% reduction in the additive package. Oil is typically blended with new oil for reuse. Shell Rotella Diesel oil has a very strong additive package and is suggested for blending.

Feed Rates and Centrifuge Loading

Centrifugal cleaning power or “G force” and hydraulic drag both increase by the square of the rotor speed. A small increase in speed creates a large increase in power and drag.  Rotor drag is also proportional to the feed rate.  Feeding a centrifuge twice as fast produces twice the amount of rotor drag. Drag increases rapidly with an increase in viscosity. Therefore centrifuge loading will be much higher when rapidly feeding heavy oil into a high G force centrifuge than a slow feed of light oil into a low G force centrifuge. Light thin oils may be cleaned faster than heavy thick oils. US Filtermaxx centrifuges us a 1.5 HP motor to handle the heavy loading produced by higher feed rates and thicker oil. We also offer variable speed centrifuges that may be adjusted for the best results with any viscosity and feed rate.