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Hydraulic Pump Formulas for calculating Fluid Pressure, PUMP OUTLET FLOW, PUMP INPUT POWER, PUMP EFFICIENCY, VOLUMETRIC EFFICIENCY, MECHANICAL EFFICIENCY, PUMP DISPLACEMENT, PUMP TORQUE, PUMP TORQUE, and PUMP LIFE in our Fluid Power Formula Reference guide.
PUMP OUTLET FLOW in Gallons/Minute FLOW=RPM x PUMP DISPLACEMENT(Cu. In./Rev.) * * * 231 Q=nd * * * 231 PUMP INPUT POWER in Horsepower Required HORSEPOWER INPUT=FLOW RATE OUTPUT(GPM) x PRESSURE(PSIG) * * * 1714 x EFFICIENCY(Overall)HP=QP * * *or 1714 Eff GPM x PSIG * * * 1714 Eff PUMP EFFICIENCY OVERALL IN PERCENT OVERALL EFFICIENCY (%)=OUTPUT HORSEPOWER * * *x 100 INPUT HORSEPOWER Eff OV.=HP OUT * * *x 100 HP IN OVERALL EFFICIENCY (%)=VOLUMETRIC Eff. x MECHANICAL Eff.Eff OV.=Eff VOL x Eff MECH PUMP EFFICIENCY VOLUMETRIC IN PERCENT VOLUMETRIC EFFICIENCY (%)=ACTUAL FLOW RATE OUTPUT(GPM) * * *x 100 THEORETICAL FLOW RATE OUTPUT(GPM)Eff VOL=Q ACT. * * *x 100 Q THEO. PUMP EFFICIENCY MECHANICAL IN PERCENT MECHANICAL EFFICIENCY (%)=THEORETICAL TORQUE TO DRIVE * * *x 100 ACTUAL TORQUE TO DRIVE Eff MECH=T THEO. * * *x 100 T ACT. PUMP DISPLACEMENT IN CUBIC INCHES/REVOLUTION DISPLACEMENT=FLOW RATE(GPM) x 231 * * * PUMP RPM CIPR=GPM x 231 * * * RPM PUMP TORQUE IN INCH POUNDS TORQUE=HORSEPOWER x 63025 * * * RPM T=63025 HP * * * RPM PUMP TORQUE IN INCH POUNDS TORQUE=PRESSURE(PSIG) x PUMP DISPLACEMENT(CIPR) * * * 2 x 3.14 T=PSIG d * * * 2 x 3.14 or T=Pd * * * 2 x 3.14 PUMP LIFE B 10 BEARING LIFE B 10 HOURS OF BEARING LIFE=RATED LIFE HOURS x RATED SPEED(RPM)x(RATED PRESSURE(PSIG))3 * * ** * * NEW SPEED(RPM)(NEW PRESSURE(PSIG))3 B 10=RATED HRS.x RPM r x(P r)3 * * ** * * RPM n(P n)3
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