Torque and horsepower relations:
T = HP x 5252 ÷ RPM
HP = T x RPM ÷ 5252
RPM = HP x 5252 ÷ T
Torque values are in foot-pounds. |
Hydraulic (fluid power) horsepower:
HP = PSI x GPM ÷ 1714
PSI is gauge pressure in pounds per square inch, GPM is oil flow in gallons per minute. |
| Velocity of oil flow in pipe:
V = GPM x 0.3208 ÷ A
V is oil velocity in feet per second, GPM is flow in gallons per minute, A is inside area of pipe in square inches. |
Charles' Law for behaviour of gases:
T1V2 = T2V1, or T1P2 = T2P1
T1, P1 and V1 are initial temperature, pressure and volume, and T2, P2 and V2 are final conditions. |
Boyle's Law for behaviour of gases:
P1,V1 = P2,V2
P1, V1 are initial pressure and volume; P2 and V2 are final conditions. |
Heat equivalent of fluid power:
BTU per hour = PSI x GPM x 1-1/2
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Burst pressure of pipe or tubing:
P = 2t x S ÷ 0
P is burst pressure in PSI, t is wall thickness, in inches; S is tensile strength of material in PSI; O is outside diameter, in inches.
0 est le diamètre extérieur en pouces. |
Thrust or force of any cylinder:
T = A x PSI
T is thrust or force, in pounds, A is piston area in square inches, PSI is gauge pressure. |
Hydraulic Cylinder Piston travel speed:
S = CIM ÷ A
S is piston travel speed, inches per minute, CIM is oil flow into cylinder, cubic inches per minute, A is piston area in square inches. |
Pressure loss per foot of pipe:
P = V x Q ÷ 18,300 D4
P is pressure loss in PSI per foot of pipe length.
V is SSU viscosity at operating temperature.
Q is GPM flow. D is inside diameter of pipe in inches |
| Force for piercing or shearing sheet metal:
F = P x T x PSI
F is force required, in pounds, P is perimeter around area to be sheared, in inches, T is sheet thickness in inches; PSI is the sheer strength rating of the material in pounds per square inch.
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Heat radiating capacity of a steel reservoir:
HP = 0.001 x A x TD
HP is the power radiating capacity expressed in horsepower; A is surface area, in square feet; TD is temperature difference in °F between oil and surrounding air. |
| Effective force of a cylinder working at an angle to direction of the load travel:
F = T x sin A
T is the total cylinder force, in pounds; F is the part of the force, which is effective, in pounds, A is the least angle, in degrees, between cylinder axis and load direction.. |