hydraulic pump sizing for a 6 tonne cargo lift
hydraulic pump sizing for a 6 tonne cargo lift
(OP)
We are fabricating a 6 tonne cargo lift , piston is having a stroke 3m, cylinder dia 80 mm shaft Dia 40 and we are facing problem in finding a right pump for our cargo lift.





RE: hydraulic pump sizing for a 6 tonne cargo lift
Mike Halloran
Pembroke Pines, FL, USA
RE: hydraulic pump sizing for a 6 tonne cargo lift
RE: hydraulic pump sizing for a 6 tonne cargo lift
Pressure to lift 6000kg or 58.860kN is 117 BAR or 11.7 MPa
Power required, assuming 80% efficiency is 21.9kW, say 25kW to be safe.
Adrian
RE: hydraulic pump sizing for a 6 tonne cargo lift
The capacity of pump which you had calculated 90 lit /min is way too much .
Piston which has a length of 3m and Diaz of 80 mm will be around 28 lit/min
So Kw should go down?.
RE: hydraulic pump sizing for a 6 tonne cargo lift
Assuming pushing on full bore of cylinder.
Bore = 80mm
Area = 80^2xPI/4 = 0.005027m^2
Length = 3m
So volume = 3 x 0.005027 = 0.01508m^3 = 15 litres
You want 18mtrs/min, so that's 6 x 15 = 90
The pressure at 6000kg = 117 BAR
To lift 6000 kg with that cylinder at that velocity will take 22kW at 80% eff.
I can't see where you would get 28 litres/ min from...please explain.
Cheers
Adrian
RE: hydraulic pump sizing for a 6 tonne cargo lift
18 x 0.005027 = 0.0905 Same result, 90lpm
Ted
RE: hydraulic pump sizing for a 6 tonne cargo lift
DOL
RE: hydraulic pump sizing for a 6 tonne cargo lift
When he agrees with volumetric flow required we can ask him the more difficult questions about buckling calcs and motion control valves.
Then we can finish him off with CE marking and LOLER regulation compliance.
Adrian