About Dongqi Groupĭongqi Group is a Sino-foreign joint venture. So, now do you have more understanding about it? If you are still not clear with that but want to know more welcome to contact us and ask more information. Load factor 1.93 1.73 1.41 Comparative Methods of Slinging Square root of the wight(Kg) divide by the grade of China Or SWL=0.3*D²*Grade Formula Size-Chain of different grade Grade 80 chain=24 times stronger than fibre rope Formula for different grades Grade 60 chain=18 times stronger than fibre rope Grade 40 chain=12 times stronger than fibre rope Grade 30 chain=9 times stronger than fibre rope SWL=8D² Steel wire rope descarding factorġ0% of the wires broken in a length of eight times the diameterĨ*20mm=160mm 11 wires broken over a length of 160mm discard sling (Diameter)²*8=SWL Kg Example: For a steel wire rope of 15mm diameter Rope diameter=√90=30mm Wire Rope Construction As we all known:Īll diameters are measured in millimetres (mm).Īll weight are calculated in Kilograms(kg). Wire rope and chain are the important part of the hoist which are closely bound up with the safe work load, now let’s talk about how to calculate the SWL of ropes and chains.
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