Formula For: Word Formula: Letter Formula:
PUMP OUTLET FLOWin Gallons/Minute
FLOW = RPM x PUMP DISPLACEMENT(Cu. In./Rev.)
231
PUMP INPUT POWER in Horsepower Required
HORSEPOWER INPUT = FLOW RATE OUTPUT(GPM) x PRESSURE(PSIG)
1714 x EFFICIENCY(Overall)
PUMP EFFICIENCYOVERALL IN PERCENT
OVERALL EFFICIENCY
(%) = OUTPUT HORSEPOWER
x 100
INPUT HORSEPOWER
EffOV. = HP OUT
x 100
HP IN
OVERALL EFFICIENCY (%) = VOLUMETRIC Eff. x MECHANICAL Eff.
EffOV. = EffVOL x EffMECH
PUMP EFFICIENCYVOLUMETRIC IN PERCENT
VOLUMETRIC EFFICIENCY
(%) = ACTUAL FLOW RATE OUTPUT(GPM)
x 100
THEORETICAL FLOW RATE OUTPUT(GPM)
EffVOL = QACT.
x 100
QTHEO.
PUMP EFFICIENCYMECHANICAL IN PERCENT
MECHANICAL EFFICIENCY
(%) = THEORETICAL TORQUE TO DRIVE
x 100
ACTUAL TORQUE TO DRIVE
EffMECH = TTHEO.
x 100
TACT.
PUMP DISPLACEMENTIN CUBIC INCHES/REVOLUTION
DISPLACEMENT = FLOW RATE(GPM) x 231
PUMP RPM
PUMP TORQUEIN INCH POUNDS
TORQUE = HORSEPOWER x 63025
RPM
PUMP TORQUEIN INCH POUNDS
TORQUE = PRESSURE(PSIG) x PUMP DISPLACEMENT(CIPR)
2 x 3.14
PUMP LIFE B10 BEARING LIFE
B10 HOURS OF
BEARING LIFE =
RATED LIFE HOURS x RATED SPEED(RPM) x (RATED PRESSURE(PSIG) )3
NEW SPEED(RPM) (NEW PRESSURE(PSIG) )3
B10 = RATED HRS. x RPMr x (P r)3
RPMn (P n)3
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