Table 14. When to Replace Wire Rope-Based on Number of Broken Wires
| Standard | Equipment (lbs per ft) |
Number Broken Wires in Running Ropes |
Number Broken Wires in Standing Ropes |
||
|---|---|---|---|---|---|
| In One Rope Lay |
In One Strand |
In One Rope Lay |
At End Connection |
||
| ASME/B30.2 | Overhead & Gantry Cranes | 12** | 4 | Not Specified | |
| ASME/B30.4 | Portal, Tower & Pillar Cranes | 6** | 3 | 3 | 2 |
| ASME/B30.5 | Crawler, Locomotive & Truck | Retirement criteria based on number of broken Cranes Rotation Resistant Rope wires found in length of rope equal to 6 times rope diameter – 2 broken wires maximum, and 30 times rope diameter – 4 broken wires maximum. | |||
| Running Rope | 6** | 3 | 3 | 2 | |
| ASME/B30.6 | Derricks | 6** | 3 | 3 | 2 |
| ASME/B30.7 | Base Mounted Drum Hoists | 6** | 3 | 3 | 2 |
| ASME/B30.8 | Floating Cranes & Derricks | 6** | 3 | 3 | 2 |
| ASME/30.16 | Overhead Hoists | 12** | 4 | Not Specified | |
| ANSI/A10.4 | Personnel Hoists | 6** | 3 | 2** | 2 |
| ANSI/A10.5 | Material Hoists | 6** | Not Specified | ||
**Also remove for 1 valley break
Figure 43. A wire broken under a tensile load that exceeds its strength is recognized by the “cup and cone” configuration at the fracture point (a). The necking down of the wire at this point shows that failure occurred while the wire retained its ductility. Shear-tensile fracture (b) occurs in wire subjected to a combination of transverse and axial loads. Fatigue breaks are usually characterized by squared-off ends perpendicular to the wire either straight across or Z-shaped (c&d).