Safety factor of the wire rope in a chain block

The ratio of the minimum breaking tension of the wire rope to the total working load is the safety factor. The safety factor of the new wire rope should ensure that it can provide reliable service throughout its service life under normal fatigue stresses and wear conditions. In applications involving the transportation of personnel, valuable items, or items that require a long service life, as well as in corrosive environments or those where frequent inspections are difficult, a higher safety factor should be adopted. Below are the recommended values for selecting safety factors: Type Safety Factor Staticly tensioned steel wires and steel strands 3–4 Main cables of small suspension bridges 3–3.5 Suspension wires of small suspension bridges 3.5–4 Cables in aerial ropeways 3–4 Traction cables in aerial ropeways 5–6 Cranes, etc. 5–5.5 Control cables on grab cranes 4–5 Excavators 5 Horizontal traction and continuous traction vehicles 4–5 Mine hoists, shafts, and inclined shafts Minimum 5 Industrial hoists Minimum 6 Bridge, gantry, tower, and mast cranes Minimum 6 Elevators – For carrying people Minimum 12 – For carrying goods Minimum 10 Hot metal cranes Minimum 8 Non-rotating wires, 18×7 type Minimum 10 :lol :victory: