MOTOR HORSEPOWER

In order to relate the motor horsepower to apparent power, multiply the horsepower by .746 (Conversion Factor--hp to watts) and divide by the motor efficiency. 


Where: 


HP
=
motor horsepower
=
efficiency of motor
P.F.
=
power factor of motor


HORSEPOWER REQUIREMENTS FOR PUMPS 




=
differential pressure across a pump in psi
GPM
=
the required flow rate in gallons per minute
=
pump efficiency


SYNCHRONOUS SPEED BY NUMBER OF POLES

POLES
60 CYCLES
50 CYCLES
2
3600
3000
4
1800
150
6
1200
1000
8
900
750
10
720
600