General Discard Criteria : Crane Wire Ropes

Rope diameter reduction> 7% of NRD, only due to external wear.
Rope diameter reduction> 3% of NRD for rotation resistant ropes and > 10% for other ropes due to reasons other than external wear.
For single layer (6 and 8 strands) and parallel closed ropes if number of visible broken wires exceed 4% of total load bearing in all outer stands of the rope, over a length of 6d or 8% in 30d
For rotation resistant ropes if number of visible broken wires exceed 2 over a length of 6d or 4 in 30d.
Concentrated close group of broken wires in a length of 6d or in one strand.
Wire break in the strand valley indicate internal rope deterioration requiring closer inspection of the rope, 2 or more valley breaks in the 6 x d requires discard.
Broken wires adjacent to, the termination, requires the termination to be remade by shortening the rope otherwise the rope shall be discarded.
Localized distortion, damage crushing, kink, loop, birdcage formation.
Localized core or stand protrusion
Localized rope diameter reduction or lay variation associated with waviness
Collapsed core or complete fracture of one strand
Sign of sever corrosion or pitting
Damage due to heat.

For discard of ropes other than crane wire ropes relevant codes/standard should be referred.
The rope should be examined by a competent person who should always refer relevant
code/recommendation/ standard for deciding rope discard.