Document P/N:
2P121260
Release Date: 02/27/2017
Revision: E
8 of 41
To calculate the flow in gal/rev or GPM when the plunger diameter, stroke length, and number of
cylinders is known:
PD x PD x .7854 x SL x NC = GPR
231
GPR x RPM = GPM
To calculate the fluid flow velocity through a pipe or hose when the GPM and pipe size are known:
Pipe I.D. x Pipe I.D. x .7854 = Internal Area = A
GPM x .3208 = Flow Velocity
A
To calculate the size pipe of hose required to maintain a specified flow velocity when the GPM and
desired flow velocity are known:
GPM x .3208 = Internal Area Required
FV
To calculate the maximum allowable GPM through a specified hose or pipe at a specified flow velocity
when the internal area of the pipe and the desired flow velocity are known:
FV x A = Max GPM
.3208
To calculate pinion shaft or driveline torque when the input BHP and pinion shaft RPM are known:
BHP x 5252 = Torque
Pinion Shaft RPM
Conversion Factors:
Multiply: By: To Obtain:
Barrels (U.S.) 42 Gallons (U.S.)
Gallons (U.S.) .023809 Barrels (U.S.)
Gallons (U.S.) 231 Cubic Inches
Cubic Inches .004329 Gallons (U.S.)
Cubic feet per second 448.831 GPM
GPM .002228 Cubic Feet per Second
Head Feet (water) .4331 PSI
PSI 2.309 Head Feet (water)
Kilowatts 1.341 Horsepower
Horsepower .7457 Kilowatts
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