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Floating cranes and floating sheerlegs for very high loads (normally above 100 t) Shipboard cranes
hook
M4
M3-M4
M3-M4
M2
M3
Shipboard cranes
grab or magnet
M5-M6
M3-M4
M3-M4
M4-M5
M3-M4
Tower cranes for construction sites
M4
M5
M4
M3
M3
Derrick tower gantry
M2-M3
M1-M2
M1-M2
—
—
Railroad cranes, approved for service in trains
M3-M4
M2-M3
M2-M3
—
—
M3-M4
M2-M3
M2-M3
—
—
Vehicle-mounted cranes
hook
T2
T3
T4
T5
T6
T7
T8
Average usage per day [h]
0.25 - 0.5
0.5 - 1
1-2
2-4
4-8
8 - 16
about 16
Total service life [h]
400 - 800
800 - 1600
1600 - 3200
3200 - 6300
6300 - 12500
12500 - 25000
25000 50000
Duty cycle load class
Machine class & torque conversion factor K
L1
light
M1 1.24
M2 1.24
M3 1.11
M4 1.11
M5 0.95
M6 0.91
M7 0.85
L2
medium
M2 1.24
M3 1.24
M4 1.08
M5 1
M6 0.87
M7 0.80
M8 0.67
L3
heavy
M3 0.98
M4 0.95
M5 0.91
M6 0.80
M7 0.71
M8 0.59
M8 0.56
L4
extremely heavy
M4 0.80
M5 0.75
M6 0.71
M7 0.63
M8 0.56
M8 0.5
M8 0.44
Definition of Nominal Torque TNom
Additional check – conditions
– Drum output speed 25 rpm
1- For all machine classes > M5 (M6-M8): to be checked, whether drum output speed 25rpm must be reduced. Refer to Carraro Sales or Application engineering.
– FEM class M5 / T5 / L2
Torque calculation Teff for alternative FEM – class Teff = K × TNom K: torque conversion factor
2- Brake torque safety must be checked upon formula: TBrake × i V= Teff
> 1.6
TBrake: brake torque at drive input i: drive ratio If brake safety < 1.6 refer to Carraro Sales or Application engineering.
