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Fluid Power Information Center
Miscellaneous Hydraulic Formulas
Formula For: Word Formula: Letter Formula:
TORQUE REQUIRED
in Inch Pounds
TORQUE = LEVER LENGH(In.) x PULL(lb.)
T = l x F
NET AREA OF PISTON
in Square Inches
AREA = ID2(in.) x 0.7854
A = d2 x 0.7854
FLUID VELOCITY
in Feet per second
VELOCITY  = 0.3208 x FLOW(GPM)

AREA OF PASSAGE(Square Inches)
V  = 0.3208 x Q

A
KILOWATTS REQUIRED TO HEAT SUBSTANCES
in Kilowatt Hours
KILOWATT HOURS  = WEIGHT OF SUBSTANCE(lb.) x SH x TEMPERATURE DIFFERENCE(oF)

3413
KWH  = W x SH x (DELTA)T

3414
SH = Specific Heat
WEIGHT OF FLUID OF KNOWN SPECIFIC GRAVITY
in Pounds/Gallon
WEIGHT  = 62.4283 x SPECIFIC GRAVITY

7.4805
W  = 62.4283 x SG

7.4805
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