This article will deal with kinks and bends in wire rope, likely causes, tips on how to identify them, and advice on whether to discard or not.
A kink or bend can occur in wire rope at any point in their lifetime from supply to operation. Mechanical damage is usually the culprit in their formation.
A few possible causes/times of kinking/bending are:
Care taken in handling and during the operation of the crane will eliminate the majority of occurrences.
ISO 4309:2017 suggests that we apply a severity rating of either 20% or 100%, where 100% means discard. Unlike a wire rope sling (where we discard the rope based on the severity of the kink or bend), in crane rope, we need to take into account the following factors:
Kinks (like the ones shown below in figure 1) are usually catastrophic and are a "no-brainer" in terms of discard regardless of the location.
Figure 1 - Severe kink in wire rope.
Bends are a little bit more varied and will depend on whether it is in the working part of the rope running over a sheave or on and off the drum or in the standing part.
Figure 2 - Slight bend in wire rope.
Figure 3 - Bend with displaced wires and strands.
Figure 3a - Severe bend in wire rope.
As with any problem found in a wire rope the decision to discard will be based on the duty of the crane, the knowledge and experience of the inspector and the general condition of the rest of the rope.
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