What is the discard criteria for bird-caged wire rope?
Bird-caged wire rope must be immediately discarded when the cage length exceeds one rope lay or when accompanied by core protrusion.
Bird-caging occurs when wire rope strands separate and balloon outward, creating a cage-like appearance. This severe distortion happens due to shock loading, overloading, or improper spooling. The critical discard criterion is when the cage length equals or exceeds one rope lay length (the distance for one strand to make one complete wrap around the rope core).
Remember: "One Lay Out, Core Sticks Out = Bird Cage DISCARD"
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