1 Nature and number of broken wires
The overall design of the lifting machinery does not allow the wire rope to have an infinite long life. For 6 - and 8-strand wire ropes, breaking occurs mainly on the outside. For the multi-strand wire rope (typical multi-strand structure) is different, most of this wire rope break occurs in the interior, so it is an "invisible" break.
2 The end of the rope is broken
When there is a broken wire at or near the end of the rope, even if the number is small, it indicates that the stress in the part is high, which may be caused by the incorrect installation of the rope end, and the cause of the damage should be identified. If the length of the rope allows, the broken wire should be cut and re-installed reasonably.
3 Local aggregation of broken wires
If the broken wires are close together to form a local aggregation, the wire rope should be scrapped. If such broken wires are concentrated in a rope length range of less than 6d, or in any rope strand, then even if the number of broken wires is less than the value listed in the table, the wire rope should be scrapped.
4 Increase rate of broken wire
In some use cases, fatigue is the main cause of wire rope damage, broken wire is in use after a period of time began to appear, but the number of broken wire gradually increased, its time interval is getting shorter and shorter. In this case, in order to determine the rate of increase in broken wires, the increase in broken wires should be carefully examined and recorded. Determining this "rule" can be used to determine the future date of wire rope obsolescence.
5 Rope strand is broken
If there is a break in the entire rope strand, the rope should be scrapped.
6 Reduced rope diameter due to rope core damage
When the fiber core of the wire rope is damaged or the steel core (or the internal rope strand in the multi-layer structure) is broken, resulting in a significant reduction in the rope diameter, the wire rope should be scrapped. Minor damage, especially when the stresses in all strands are well balanced, may not be apparent with the usual testing methods. However, this situation will cause the strength of the wire rope to be greatly reduced. Therefore, when there are any signs of minor internal damage, the inside of the wire rope should be inspected to find out. Once the damage is confirmed, the wire rope shall be scrapped.
7 Reduced elasticity
In some cases (usually related to the working environment), the elasticity of the wire rope can be significantly reduced and it is unsafe to continue using it.
