Hydraulic Formulas

Theoretical Thrust (Cylinders)
N = Effective area (sq.cm) x pressure (bar) x 10
Lb = Effective area (sq.in) x pressure (psi)

Hydraulic Power

kW =

Flow rate (L/min) x pressure (bar)


600

hp =

Flow rate (gpm) x pressure (psi)


1714

Geometric Flow Rate (Cylinders)

L/min =

Effective area (sq.cm) x piston speed (m/min)


10

gpm =

Effective area (sq.cm) x piston speed (in/min)


231

Velocity of Fluid in Pipe

m/sec =

Flow rate (L/min) x 21.22


D x D

(D: inside diameter of pipe in mm)
ft/sec =

Flow rate (gpm) x 0.408


D x D

(D: inside diameter of pipe in mm)