Crane wire rope
Most cranes come with a recommended type of wire rope to use on the different functional components. Proper application of the rope to each crane function is necessary to extract best performance, prevent accident and avoid damage to the equipment. For wire rope maintenance, we use lubricants.
Construction
- Number of strand depends of the rope consruction
- Number of wire also depends on the rope construction
- The construction depends on the application
- Many different types of ropes are available
1+8+K8 227 wires
Construction: 1(1+9+9)+8(1+6)+8(1+9+9)
- Bright or galvanised steel
- Wire strength 2160 N/mm2
- Compacted strands
Plastic coated
Rotation resistant
Standard
Galvanized or stainless
steel
Types of construction
Right hand regular lay
Left hand regular lay
Right hand lay (RHL) and Left hand lay (LHL)
Selection of wire rope
Min practical factor = hoist capacity / number of reeving
Zp=F0/S
EXAMPLE:
SWL : 10t
Reeving : 4/1
Duty : M4
Zp= 10/4
Zp= 2.5t
The ratio then needs to be multiply by the gravity (9.81) and the FEM safety factor depending on the mechanism duty.
MBL =Zp x 9.81 x FEM Duty
MBL =2.5 x 9.81 x 4
MBL =98.1kN
The MBL then needs to be compared to the wire rope supplier table and the suitable wire rope is selected.
Group Mechanism | Multiplicator |
M3 | 3.55 |
M4 | 4 |
M5 | 4.5 |
M6 | 5.6 |
M7 | 7.1 |
M8 | 9 |