mechanical formula, circumference, diameter, velocity, rpm revolutions per minute,torque, horsepower, formulas and constants Drive System Mech Formulas | Applied Industrial Technologies | Applied.com
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  Applied Industrial Technologies Drive System Mechanical Formulas table and Formulas and Constants equivalents available for easy reference.
   
   Products > ... Technical Reference > Drive System Mech Formulas

Drive System Mechanical Formulas

Need to find:

Formula:

Circumference
of a circle

3.1416 x Diameter

Diameter
of a circle

Circumference
(3.1416)

Velocity
in feet per minute

FPM = .262 x Diameter x rpm

rpm
revolutions per minute

Feet per minute
(2.262 x Diameter)

Torque
in/lbs

hp x 63025
rpm

Torque
in/lbs

Force (lbs) x radius (in)

Horsepower (hp)

Torque (in/lbs) x rpm
63025

Horsepower (hp)

Force x FPM
33000

Belt Length

[1.57 x ( DIA + dia] = ( 2 x Center Dist)

Motor rpm
synchronous

120 x 60 (HZ)
Number of motor poles

Pump Motor hp

GPM x head in feet x spec gravity
3960 x efficiency of pump

Fan Motor hp

CFM x pressure (lb/sq ft)
33000 x efficiency

 

 

 

 

 

 

 

 

 

 


Formulas and Constants

1 hp = 33,000 / Foot-pounds of work per minute

1 hp = .746 KW = KW ÷ 1.341

1 hp= 2,547 BTU per hour

1 BTU = Heat required to raise 1 lb water 1 °F

1 BTU = 777.6 / Foot-pounds work

1 Kilowatt Hour = 3,415 BTU

Heat Value of Carbon = 14,600 BTU per pound

Latent Heat of Fusion of Ice = 143.15 BTU per pound

Latent Heat of Evaporation of Water at 212 °F. = 970.4 BTU per pound

Total Heat of Saturated Steam at Atmospheric Pressure = 1,150.4 BTU per pound

1 Ton of Refrigeration = 288,000 BTU per 24 hours

g = Acceleration of Gravity (commonly taken as 32.16 feet per second per second)

1 Radian = 57.296°

1 Meter = 100 cm = 39.37 in

1 Kilometer = .62137 mi

1 Gallon = 231 cu in

1 Barrel = 31.5 gal

Atmospheric Pressure = 14.7 lbs per sq in = 29.92 in mercury at 32 °F

1 lb per sq in Pressure = 2.3095 ft fresh water at 62 °F
    = 2.0355 in mercury at 32 °F
    = 2.0416 in mercury at 62 °F

Water Pressure (lbss per sq in) = .433 X height of water in ft (Fresh water at 62 °F)

Weight of 1 cu ft Fresh Water = 62.355 lbs at 62 °F = 59.76 lbs at 212 °F

Weight of 1 cu ft Air at 14.7 lbs per sq in Pressure = .07608 lbs. at 62 °F = .08073 lbs at 32 °F


Information used with permission of Dodge and Reliance Electric © 2007

 




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