Criteria
for Replacement of Wire Ropes
When to Replace Wire Rope - Based on Number of Broken Wires
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).
TOP
P.O. Box 33170
5250 River Road
Cincinnati, OH 45233
Phone: (513) 941-2443
Fax: (513) 941-2445
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