Can't find what you're looking for? Try searching the site with the search box to the left. Technical Support
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General
Rules |
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Flow
velocity in hydraulic lines: Pump suction lines 2 to 4 feet
per second, pressure lines up to 500 psi - 10 to 15 ft./sec., pressure
lines 500 to 3000 psi - 15 to 20 ft./sec.; all oil lines in air-over-oil
systems; 4 ft./sec. |
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Horsepower
for driving a pump: For every 1 hp of drive, the equivalent
of 1 gpm @ 1500 psi can be produced. |
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Horsepower
for idling a pump: To idle a pump when it is unloaded will
require about 5% of it's full rated power |
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Wattage
for heating hydraulic oil: Each watt will raise the
temperature of 1 gallon of oil by 1° F. per hour. |
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Useful
Formulas |
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Cylinder
Area (sq. In.) = 3.1416 × Radius (inch)(sq.) |
A
= Pi × R(sq.) |
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Cylinder
Force (pounds) = Pressure (psi) × Area (sq. in.) |
F
= P × A |
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Cylinder
Speed (ft./sec.) = (231 × gpm) / (12 × 60 × Area) |
v
= (0.3208 × gpm) / A |
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Fluid
Motor Horsepower = Torque (in. lbs.) × rpm / 63025 |
HP
= TN /63025 |
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Fluid
Pressure (PSI) = Force ( pounds) / Area ( sq. in.) |
PSI
= F/A |
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Fluid
Motor Speed (rpm) = (231 × gpm) / disp. (cu. in.) |
n
= (231 × gpm) / d |
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Fluid
Motor Torque (in. lbs.) = Pressure (psi) × disp. (cu.in./ rev.)
/ 6.2822 |
T
= (P ×d) / (2 ×3.1416) d = disp. rev (cu. in. / rev.) |
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Hydraulic
Horsepower = Pressure (psi) × gpm / 1714 |
HP
= (psi × gpm) / 1714 |
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Pump
Input Horsepower = gpm × Pressure (psi) / 1714 × eff. |
HP
= (Q ×P) / 1714 × E |
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Pump
Output Flow (gpm) = (Speed (rpm) × disp. (cu. in.)) / 231 |
gpm
= (n ×d) / 231 |
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