What are the standards for wire rope scrapping

1. The number of broken wires of hoisting machinery steel wire rope within one twist pitch reaches 10% of the total number of wires of steel wire rope. Such as rope 6 × 19 = 114 wires. When the number of broken wires reaches 12, it shall be scrapped and renewed, such as rope 6 × 37 = 222 wires. When the number of broken wires reaches 22, it shall be scrapped and renewed. For the steel wire rope composed of thick and thin wires, the number of broken wires is calculated as one fine wire and 1.7 thick wire

2. If the radial wear or corrosion of the steel wire exceeds 40% of the original diameter, it shall be scrapped. When it is less than 40%, the number of broken wires can be reduced and scrapped according to the regulations.

3. The number of scrapped wires of steel wire rope for hoisting hot metal or dangerous goods by hoisting machinery shall be half of the scrapping standard of steel wire rope for general crane. In addition, in one of the following cases, the steel wire rope shall also be scrapped.

When the diameter of steel wire rope is reduced by 7%; When the whole strand of outgoing line is broken; When the steel wire rope has obvious internal corrosion; When the local outer steel wire rope shows "cage" distortion; The fiber core of the steel wire rope is twisted, bent, plastically deformed, the hemp core is detached, and the performance of the steel wire rope is affected by arc high temperature burn.

4. The whole rope strand shall be scrapped if it is broken.

5. When the diameter of the steel wire rope is reduced by 7% or more relative to the nominal diameter, the steel wire rope shall be scrapped even if no broken wire is found.

6. The exposed hemp core shall be scrapped.

7. The steel wire rope shall be scrapped if it has obvious corrosion.

8. Local outer steel wire is elongated in cage shape and shall be scrapped

9. Mechanical damage of steel wire rope jacketing machine due to bearing operation on sharp protrusions.

10. Local wear due to friction of supporting structure. The steel wire rope vibrates between the crown wheel and the drum.

11. Narrow wear can lead to fatigue fracture, which can be caused by working in too large rope groove or working in too small support groove casserole.

12. The steel wire rope is seriously worn and the fiber main core protrudes. The use shall be stopped and the steel wire rope shall be replaced with a new one

13. The serious wear of steel wire rope twisted in the same direction is caused by the friction between the intersection points of multi-layer wound steel wire rope.

14. The steel wire rope will be damaged due to the serious corrosion caused by soaking the steel wire rope in the chemically treated water of the clamp, so the steel wire rope should be stored in a moisture-proof and dry place.

15. There is almost no sign of damage on the surface, but the interior is rusted and the gap between strands disappears completely.

16. Typical broken wire caused by bending fatigue of steel wire rope. This kind of occurs mostly in the type of point contact steel wire rope, so it is recommended to use wire contact steel wire rope.

17. The broken wire between strands or rope cores is obviously different from the broken wire at the "top" of strands due to the lack of rope core support.