At lifting-unloading operations, when a crane is used, as a connection between the hook and the load a sling is used. It may be rope, chain, or webbing sling. They use mostly sling chains in Europe. These slings are preferred to the others because of their advantages to the rope slings, namely:
The chain is more flexible and movable than the reope, what makes the work with the sling much easier.
Having the same Work Load Limit (WLL), the chain has a smaller diameter than the rope, what influences upon the price of a kilogram.
When a rope is used, there is a possibility of an injure resulting of an eventual unwisting of the rope's fibres, whereas such injure is impossible, if a chain is used.
When a rope is overloaded and breaks, it lashes like a lash and may cause a serious injure. In the same situation, if the chain broken, it shrinks and is not dangerous for the people around.
The sling chains of the new generation, which are of quality class GK8, have a very high level of exploitation security. They have an elongation way of min. 25% till reaching the breaking load, if they are eventualy overloaded.This prevents from danger of a sudden breaking at evental overloading, because before that, the chain becomes longer min. with 25% - which is not the case with the ropes.

chain slings sheme

table of work load limit (WLL), chains class 8

table of work load limit (WLL), chains class 10

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