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