Hydraulic Pump Volume Capacity
Calculate hydraulic pump volume capacity.
Hydraulic pump capacity can be estimated in Imperial units as
q = 0.26 A s / t (1)
where
q = pump output capacity (gpm)
A = area of cylinder (in2)
s = piston stroke (in)
t = required time for full stroke (s)
- 1 gpm (US) =6.30888×10-5 m3/s = 0.227 m3/h = 0.06309 dm3(litre)/s = 2.228×10-3 ft3/s = 0.1337 ft3/min = 0.8327 gpm (UK)
- 1 in (inch) = 25.4 mm = 2.54 cm = 0.0254 m = 0.08333 ft
- 1 in2 = 6.452 cm2 = 6.452×10-4 m2 = 6.944×10-3 ft2
Hydraulic pump capacity can be estimated in Metric units as
q = 10-6 A s / t (2)
where
q = pump output capacity (l/s)
A = area of cylinder (mm2)
s = piston stroke (mm)
t = required time for full stroke (s)
Required pump output for hydraulic cylinders ranging 1 - 6 1/2 inches are indicated below. Multiply pump capacity with stroke length (in).
Example - Required Pump Capacity
A 3" hydraulic cylinder with cylinder area 7.065 in2 makes a 30 inches stroke in 3 seconds. The required pump capacity can be calculated
q = 0.26 (7.065 in2) (30 in) / (3 s)
= 18.4 gpm
