Quantcast Inspection Of The Broken Rope Safety Device

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e. Number of broken strands per lay.
f. The manner in which the fittings are attached.
g. The condition of the sheaves over which the rope must pass, including sheave alignment.
h. The amount of wear on the outer wires.
Any evidence of serious rope deterioration from corrosion should cause consideration to be given
to immediate replacement of the rope. More than one strand should be cause for caution. Breaks
occurring in the valley between adjacent strands are generally a warning of an abnormal
condition, justifying caution. Any broken wires at the dead end of a cable should be cause for
cutting off a section. Preferably at least three feet beyond the broken wires. Refasten the rope.
If the rope is not long enough, use a new piece of rope. Any of the following conditions should
cause the inspector to question the remaining strength of a rope, and to give consideration to the
possibility of discarding the rope:
a. If the core shows through more than one pair of strands.
b. If kinking damage is severe.
c. If there is evidence of improper lubrication, combined with other defects.
d. If wire has come in contact with an electrical circuit or has been subjected to overheating.
e. If there is serious reduction in rope diameter.
f. If there is evidence of "bird-caging". This increased diameter is usually caused by the
sudden releasing of a heavy load while the rope is twisted.
g. If there are numerous broken wires or as many as three adjacent broken wires in one rope
16.3.6 Inspection Of The Broken Rope Safety Device
(See Figure 16-9). The function of the broken rope safety device is to prevent the carriage
from free-falling in the event of a broken (or slack) hoist cable. Sliding wedges are used to
"Jam" the carriage against the mast to prevent it from free-falling. one complete installation is
found on each side of the carriage. Actuation of the slack cable limit switch occurs in


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