Crane slings are generally can be divided in the following types: Chain sling, wire rope sling, nylon slings, synthetic web, cargo nets, synthetic web, etc. Each type of crane sling has its own merits and shortcomings. In the following, the most frequently used crane slings will be put in length.
The chain slings are banned to use when the chain slings are found with defective welds, questionable welds, bending chain links or elongation chain links, cracked or deformed master and coupling links, etc. When the identification tags of the chain slings are miss, it is also forbidden to put into use. Any deformation, cracking or wearing is found, the chain slings are not ready to use. And any other unsafe condition is observed, it is banned to use.
Wire rope slings are not allowed to use when find five broken wires in on strand in on lay, kinking, crushing, bird caging, heat damage, attachment cracking, deforming or wearing, etc.
The synthetic slings are not qualified to use when the synthetic sling are found acid or caustic burns, age deterioration, melting or charring on the surface, colored thread exposure due to snags, tears, or cuts, etc. And also the synthetic slings are also forbidden to use when the identification tags are unreadable or missing, etc.
When select the crane slings, the following factors should be considered, the single specification, the size of the objects or loads, weight, shape, and the way of the hoisting, etc.
The safety of the crane slings are affected by the following factors:
1) Size, Weight, and Center of Gravity of the Load.
By the center of the gravity of the load, it means the crane hook must be directly over the center of gravity point. If NOT, it may result in to dangerous tilting and uneven stress to the sling leg.
2) Rated Capacity of the Sling.
The capacity of the crane sling varies with the sling types, sizes, and hitch types, etc. Notice the older crane slings must be used with caution.
3) History of Care and Usage.
The sling-related accidents are mainly resulted from the mishandling and misuse of the slings. Proper care of the crane slings is important for maximum service and safety. The crane slings must be protected with wood blocking, burlap padding and cover saddles to prevent sharp bends and cutting edges.
For the use of crane slings, the following rules should be followed:
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