Conversion Factors

1HP = 33,000 ft. lbs. per minute
1HP = 42.4 btu per minute
1HP = 0.746 kwhr (kilowatt hours)

1 U.S. Gallon = 231 cubic inches

Pipe Volume varies as the square of the diameter -
Volume in Gallons = 0.0034 x D² x L
D = inside diameter of pipe in inches, L = length in inches

Velocity in Feet Per Second = ( 0.408 x flow (gpm) ) ÷ D²
D = inside diameter of pipe in inches

Atmospheric Pressure at Sea Level = 14.7PSI
Atmospheric pressure decreases approximately 0.41PSI for each one thousand feet of elevation up to 23,000 feet.

Pressure (PSI) = feet head x 0.433 x specific gravity

Specific Gravity of Oil = 0.85 approximately

Thermal Expansion of Oil = approximately 1 cubic inch per 1 gallon per 10°F rise in temperature


Hydraulic Formulas

Horsepower = ( GPM x PSI ) ÷ 1714

Torque (lb. in.) = ( CU IN./REV. x PSI ) ÷ 2

Torque (lb. in.) = ( HP X 63025 ) ÷ RPM

Flow (gpm) = ( CU IN./REV x RPM ) ÷ 231


Head and Pressure Equivalents

The specific gravity of the liquid must be considered when converting pressure from feet of water to P.S.I. Here are some typical conversion figures:

1 P.S.I. = 2.30 feet of water (specific gravity 1.0)
1 P.S.I. = 2.88 feet of oil (specific gravity 0.8)

SINGLE PHASE MOTORS
FOR PUMP DRIVE CONTINUOUS DUTY, 40°C, UL RECOGNIZED

Single Phase: Split Phase Start, Drip Proof, Rigid Base, Class B Insulation,
Moderate Starting Torque, Sleeve Bearing

HP	RPM	VOLTAGE	NEMA FRAME	THERMAL PROF.	SERVICE FACTOR	APPROX. F.L. AMPS
1/3	1800	115	48	AUTO	1.0	6.6
1/2	1800	115	56	NONE	1.0	9.2

Single Phase: Capacitor Start, Drip Proof, Rigid Base, Class B Insulation,
Moderate Starting Torque, Sleeve Bearing

HP	RPM	VOLTAGE	NEMA FRAME	THERMAL PROF.	SERVICE FACTOR	APPROX. F.L. AMPS
1/3	1800	115/230	48	AUTO	1.0	7.0/3.5
1/2	1800	115/230	56	AUTO	1.0	9.2/4.6
3/4	1800	115/230	56	AUTO	1.0	10.4/5.2

Single Phase: Capacitor Start, Drip Proof, Rigid Base, Class B Insulation,
High Starting Torque, Ball Bearing

HP	RPM	VOLTAGE	NEMA FRAME	THERMAL PROF.	SERVICE FACTOR	APPROX. F.L. AMPS
1	1800	115/208-230	56	AUTO	1.15	13.4/6.8-6.7
1/2	1800	115/208-230	56H	AUTO	1.15	18.0/9.3-9.0
2	1800	115/208-230	145T	NONE	1.15	21.0/11.3-10.5
3	1800	115/208-230	184T	NONE	1.15	33.0/16.5
5	1800	208-230	184T	NONE	1.15	23.0-21.0
7 1/2	1800	208-230	215T	NONE	1.15	35.2

Single Phase: Capacitor Start, Totally Enclosed, Fan-Cooled, Rigid Base,
Class B Insulation, NEMA-L ( greater or = 1.0 HP ) High Starting Torque, Ball Bearing

HP	RPM	VOLTAGE	NEMA FRAME	THERMAL PROF.	SERVICE FACTOR	APPROX. F.L. AMPS
1/3	1800	115/208-230	56	AUTO	1.15	6.6/3.1-3.3
1/2	1800	115/208-230	56	AUTO	1.15	8.8/4.2-4.4
3/4	1800	115/208-230	56	AUTO	1.15	11.0/5.4-5.5
1	1800	115/208-230	56	AUTO	1.15	13.4/6.8-6.7
1 1/2	1800	115/208-230	56H	AUTO	1.15	15.2/8.2-7.6
2	1800	115/208-230	145T	NONE	1.15	18.8/9.4
3	1800	115/208-230	184T	NONE	1.0	34.0/17.0
5	1800	208-230	213T	NONE	1.0	27.5-26.0
7 1/2	1800	208-230	215T	NONE	1.0	36.5-33.0

THREE PHASE MOTORS
FOR PUMP DRIVE CONTINUOUS DUTY, 40°C, UL RECOGNIZED

Three Phase: Drip Proof, Rigid Base, Class B Insulation, NEMA B,
High Starting Torque, Ball Bearing

HP	RPM	VOLTAGE	NEMA FRAME	THERMAL PROF.	SERVICE FACTOR	APPROX. F.L. AMPS
1/3	1800	208-230/460	56	AUTO	1.35	1.5-1.6/0.8
1/2	1800	208-230/460	56	AUTO	1.35	2.3-2.4/1.2
3/4	1800	208-230/460	56	AUTO	1.25	2.9-3.0/1.5
1	1800	208-230/460	56	AUTO	1.15	3.5-3.6/1.8
1 1/2	1800	208-230/460	145T	AUTO	1.15	4.8-4.8/2.4
2	1800	208-230/460	145T	AUTO	1.15	6.2-6.2/3.1
3	1800	208-230/460	145T	AUTO	1.15	9.2-8.6/4.3
5	1800	230/460	184T	AUTO	1.15	13.2/6.6
7 1/2	1800	230/460	213T	AUTO	1.15	20.0/10.0
10	1800	230/460	215T	AUTO	1.15	26.6/13.3

Three Phase: Totally Enclosed, Fan-Cooled, Rigid Base, Class B Insulation,
Class F (182T-254T), NEMA B, High Starting Torque

HP	RPM	VOLTAGE	NEMA FRAME	APPROX. F.L. AMPS
1/3	1800	208-230/460	56	1.5-1.6/0.8
1/2	1800	208-230/460	56	2.3-2.4/1.2
3/4	1800	208-230/460	56	2.9-3.0/1.5
1	1800	208-230/460	56	3.5-3.6/1.8
1 1/2	1800	208-230/460	145T	4.8-4.8/2.4
2	1800	208-230/460	145T	6.0-5.8/2.9
3	1800	208-230/460	145T	8.6/4.3
5	1800	230/460	184T	14.0-13.2/6.6
7 1/2	1800	230/460	213T	21.0-20.0/10.0
10	1800	230/460	215T	28.0-27.0/13.5