Hydraulic HP

David G · Sep 21, 2015

I am working on figuring the gear thrust for my new hydraulic pump, first step was HP, next step is torque, then multiply it by the gear angle.

1500 PSI @ 12 GPM = 10.5 HP

If I set the pressure relief @ 1500 PSI, I can work from there.

David G · Sep 21, 2015

Next step

The pump has 50 lb/ft of torque on it @ 1500 RPM.

Brendon-KS · Sep 21, 2015

You could also use this equation: torque (in-lb) = pressure (psi) * displacement (in^3) / 6.28. The rotational speed and thus the resulting power does not need to come into play when doing the math to calculate the radial pressure on the shaft resulting from the gear tooth angle - it's all based on the maximum pressure and the pump displacement.

J. Schwiebert · Sep 21, 2015

Seat of the pants engineering used to say a good rule of thumb is it takes 1 Horse power for each one gallon output @ 1500PSI. Also remember all pumps are rated on theoretical displacement while actual output is close to 85% of theoretical flow. Pumps also become more efficient in the middle of their rated RPM band.

Hydraulic HP

David G

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David G

Well-known Member

Brendon-KS

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J. Schwiebert

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