Criteria for Replacement of Wire Ropes

 
Printable PDF
« Previous Page | Next Page »


 
Galvanized

  Number Broken Wires
in Running Ropes		 Number Broken Wires
in Standing Ropes

ANSI*
Standard

 Equipment In One
Rope Lay		 In One
Strand 		In One
Rope Lay		 At End
Connection
B30.2 Overhead & Gantry Cranes 12 4 Not Specified Not Specified
B30.4 Portal, Tower & Pillar Cranes 6 3 3 2
B30.5 Crawler, Locomotive & Truck Cranes 6 3 3 2
B30.6 Derricks 6 3 3 2
B30.7 Base Mounted Drum Hoists 6 3 3 2
B30.8 Flotaing Cranes & Derricks 6 3 3 2
B30.16 Overhead Hoists 12 4 Not Specified Not Specified
A10.4 Personnel Hoists 6** 3 2** 2
A10.5 Material Hoists 6** Not Specified Not Specified Not Specified
* American National Standards Institute
** Also remove for 1 valley break.
A wire broken under a tensile load that exceeds its strength 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 chacterized by squared-off ends perpendicular to the wire either straight across or Z-shaped (c & d).