The Importance of Wire Rope
Wire rope is the only connection between the crane hook and the load. Rope failure leads directly to loss of life and property. For this reason, no compromise should be made on rope selection, installation and maintenance.
Rope Structure and Types
Wire ropes are made by laying strands, which are groups of steel wires, around a core. Common constructions include 6x19 (standard), 6x36 (flexible) and 6x37 (high flexibility).
Correct Rope Selection
- Capacity: Minimum breaking load must be at least 5 times the working load
- Diameter: Must match minimum drum and sheave diameter requirements
- Flexibility: More flexible ropes are preferred in multi-sheave systems
- Coating: Galvanized or plastic-coated ropes should be used in corrosive environments
Maintenance and Inspection
Daily visual inspections should look for damage, broken wires, crushing, corrosion and deformation. Monthly lubrication extends rope life.
Scrapping Criteria
A rope should be scrapped when broken wires reach 10% of total wires within one lay length, when diameter loss exceeds 7% of nominal diameter, or in case of kinking deformation or advanced corrosion.