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Hydraulic pump formulas
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Virtual Machine Shop Forum  |  Machine Tool Technology  |  Questions, answers, ideas  |  Topic: Hydraulic pump formulas « previous next »
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Author Topic: Hydraulic pump formulas  (Read 241 times)
Geo.
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« on: November 29, 2016, 11:58:27 AM »

Horsepower for driving a pump:
For every 1 hp of drive, the equivalent of 1 gpm @ 1500 psi can be produced.

Horsepower for Idling a pump:
To idle a pump when it is unloaded will require about 5% of it's full rated power

Wattage for heating hydraulic oil:
Each watt will raise the temperature of 1 gallon of oil by 1X F. per hour.

Flow velocity in hydraulic lines:
Pump suction lines 2 to 4 feet per second, pressure lines up to 500 psi - 10 to 15 ft./sec., pressure lines 500 to 3000 psi - 15 to 20 ft./sec.; all oil lines in air-over-oil systems; 4 ft./sec.




   Pump Output Flow V GPM   GPM = (Speed (rpm) disp. (cu. in.)) / 231       (GPM = (n d) / 231)   

   Pump Input Horsepower V HP   HP = GPM Pressure (psi) / 1714 Efficiency    (HP = (Q P) / 1714 E)

   Pump Efficiency V E    Overall Efficiency = Output HP / Input HP    (E Overall = HP Out / HP In X 100 )
Overall Efficiency = Volumetric Eff. Mechanical Eff.    (E Overall = Eff Vol. Eff Mech. )

   Pump Volumetric Efficiency V E   Volumetric Efficiency = Actual Flow Rate Output (GPM) / Theoretical Flow Rate Output (GPM) 100      (Eff Vol. = Q Act. / Q Theo. X 100)

   Pump Mechanical Efficiency V E       Mechanical Efficiency = Theoretical Torque to Drive / Actual Torque to Drive 100    (Eff Mech. = T Theo. / T Act. 100)

   Pump Displacement V CIPR    Displacement (In.3 / rev.) = Flow Rate (GPM) 231 / Pump RPM
(CIPR = GPM 231 / RPM)

   Pump Torque V T     Torque = Horsepower 63025 / RPM       
 (T = 63025 HP / RPM)
Torque = Pressure (PSIG) Pump Displacement (CIPR) / 2k       
(T = P CIPR / 6.28)

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