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Basic Hydraulic Formulas
Formula For: Word Formula: Letter Formula:
FLUID PRESSURE
in Pounds/Square Inch
PRESSURE  = FORCE(pounds)

UNIT AREA(Square Inches)
P  = F

A
or PSIG  = F

A
FLUID FLOW RATE
in Gallons/Minute
FLOW RATE  = VOLUME(Gallons)

UNIT TIME(Minute)
Q  = V

T
FLUID POWER IN HORSEPOWER
HORSEPOWER  = PRESSURE(PSIG)  x  FLOW(GPM)

1714
HP  = PQ

1714
VELOCITY THROUGH PIPING
in Feet/Second Velocity
VELOCITY  = 0.3208  x  FLOW RATE THROUGH I.D.(GPM)

INTERNAL AREA(Square Inches)
V  = .3208Q

A
COMPRESSIBILITY OF OIL
in Aditional Required Oil To Reach Pressure
ADDITIONAL VOLUME  = PRESSURE(PSIG)  x  VOLUME OF OIL UNDER PRESSURE

250,000(approx.)
VA  = PV

250,000
COMPRESSIBILITY OF A FLUID
COMPRESSIBILITY  = 1

BULK MODULUS OF THE FLUID
C  = 1

BM
SPECIFIC GRAVITY OF A FLUID
SPECIFIC GRAVITY  = WEIGHT OF ONE CUBIC FOOT OF FLUID

WEIGHT OF ONE CUBIC FOOT OF WATER
SG  = W

62.4283
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