| A "birdcage" is caused
by sudden release of tension and the resulting rebound of rope.
These strands and wires will not be returned to their original
positions. The rope should be replaced immediately. |
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| This is a wire rope with a high strand;
a condition in which one or more strands are worn before adjoining
strands. This is caused by improper socketing or seizing, kinks
or doglegs. At top, you see a close-up of the concentration
of wear. At bottom, you see how it recurs every sixth strand
in a 6-strand rope. |
 |
| A typical failure of a rotary drill line
with a poor cutoff practice. These wires have been subjected
to continued peening, causing fatigue type failures.
A predetermined, regularly scheduled cutoff practice can help
eliminate this type of problem. |
 |
| A kinked wire rope is shown here.
It's caused by pulling down a loop in a slack line during handling,
installation or operation. Note the distortion of the strands
and individual wires. This rope must be replaced. |
 |
| This is localized wear over an equalized
sheave. The danger here is that it's invisible during the rope's
operation, and that's why you need to inspect this portion of
an operating rope regularly. The rope should be pulled off the
sheave during inspection and bent to check for broken wires, |
 |
| Here's a wire rope that has jumped a sheave.
The rope "curled" as it went over the edge
of the sheave. When you study the wires, you'll see two types
of breaks here: tensile "cup and cone"breaks and shear
breaks that appear to have been cut on an angle |
|
| Drum crushing is caused by small drums,
high loads and multiple winding conditions. |
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