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Power L/MinOil Flow Power is the ability to deli-ver a certain performance
in a certain time.Speed (V) and load (F) combined, can be ex-
pressed in power (P in kW)
by a mathematical formula:P = (V x F) : 6120 P in kW, V in meters/min.,
F in kg (1 kg ~ 10 Newton),
6120 is constant.The theoretical value can easily be calculated, but in
practice we need to install
sufficient power to over-
come efficiency losses.
Cable on sheaves, cable
on drum, gearbox, motor
electric or hydraulic and
the supply lines all create
losses. To overcome these losses we need to install extra
power. In the power chart
we already accounted for
an average loss, so the power you find in the graph is roughly the instal-
led power. PressureBar 160Kw132Kw110Kw90Kw75Kw55Kw45Kw37Kw30Kw22Kw18.5Kw15Kw11Kw7.5Kw5.5Kw3Kw2.2Kw1.1Kw 51015202530354075150225300
0510152025303540
120180240300360420 60 LINE SPEEDM/min. TonneLINE PULL Example:27 tonne pull at 16 m/min speed give 90 kW
90 kW at 186 bar give min. 300 l/minAir winchesAir pressure 7 bar
Air consumsion 21 l/s per kW Planetary winch total efficiency 80%Example:Load (F) 27 Ton, speed (V) 16 meter/min, give 88 kW by calculation. Installed electric motor will
be 90 kW
Hydraulic required, with available 300 liter/min, a pressure of 190 bar is needed. Or; When we
only have 150 liter/min. available oil flow, we need to go to a pressure over 360 Bar. Please
check the available pressure and flow in hydraulic applications and make sure it suits the power
chart's requirements. | 19 |
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