Safe work load calculation of hoisting wire rope and hoist chains

Hoisting wire rope and hoist chains are the important part of the hoist which are closely bound up with the safe work load, now let’s talk about the formula or rule of thumb to calculate the SWL of ropes and hoist chains.

Basic:

All diameters are measured in millimeters (mm).
All weight are calculated in Kilograms(kg).

Formula SWL-Fiber Rope

Diameter in mm squared=The weight in kg.
(Diameter)²=SWL Kg
Example: For a 12mm diameter rope.....
SWL=12*12=144Kg

Formula Size-Fiber Rope

Choosing the correct rope for the load
Fiber Rope Square root of weight
Example:900Kg load
Rope diameter=√90=30mm

Hoisting wire rope Construction

6*19 (6 strands*19 wires)
6*24 (6 strands*24 wires)
6*37 (6 strands*37 wires)


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