ACCELERATION |
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COMPRESSIBILITY
OF OIL |
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DENSITY |
or  |
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DEPTH OF FIELD |
Also see Common Formulas Laser Applications |
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ENERGY |
E = HE + HV + HP = Total energy contained in fluid |
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FLOW |
Through an orifice – see PRESSURE DROP |
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FORCE |
F = AP |
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FRICTION-
MECHANICAL |
Mr = W × f
NOTE: Static (or breakaway) friction coefficient is greater than kinetic (or moving) friction coefficient. |
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GRAVITY |
g = 32.16 ft / sec2 (at sea level) |
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GRAVITY-
SPECIFIC |
SP GR = Ratio of weight of a substance to weight of an equal volume of water.
For hydraulic oil: approx 0.9 |
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HEAD-
ELEVATION |
Height of liquid or fluid in feet above reference plane.
To express feet of water, HE = Vertical height of liquid above reference plane x SP GRr |
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HEAD-
VELOCITY |
 |
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HEAD-
PRESSURE |
 |
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| HEAT |
BTU/MIN = L × SP HT × LB/GAL × Temp change (Fº) |
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| HORSEPOWER |
 |
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| MASS |
 |
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| ORIFICE AREA |
see PRESSURE DROP |
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| PRESSURE |
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PRESSURE-
ATMOSPHERIC |
Normal = 14.7 PSI - 29.92 in Hg = 33.0 ft water |
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| PRESSURE DROP |
For oil hydraulic systems, the following will approximate pressure drop through "short orifice" (1/4 to 1/2-inch long-length not over 3 times diameter):
For specified pressure drop: A (required) = 
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| RADIAN |
 |
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| SPRING RATE |
F/Distance compressed (or stretched),
where the distance is from the free length |
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| TORQUE |
 |
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| VELOCITY |
Angular: Radians/SEC = 
Flow:  |