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4-5. Wire Rope Inspection
a. Make a thorough inspection or the wire rope at least once
each month and keep a written, dated and signed report of
rope condition on file. Any deterioration, resulting in
appreciable loss of original strength, such as described
below, shall be carefully noted and determination made as
to whether further use of the rope would constitute a safety
hazard. See Figure 4-4 for identification of wire rope
components.
1) Reduction of rope diameter below nominal due to loss of
core support, internal or external corrosion or wear of
outside wires.
2) A number of broken outside wires and the degree or
distribution or concentration of such broken wires.
3) Worn outside wires.
4) Sections of rope which are normally hidden during
inspection or maintenance procedures, such as parts
passing over sheaves, should be given close inspection
as these are points most subject to deterioration.
5) Corroded or broken wires at end connections.
6) Corroded, cracked, bent, worn or improperly applied end
connections.
7) Kinking, crushing, cutting or unstranding.
b. No precise rules can be given for determination of exact
time for replacement of wire rope, since many variable factors
are involved. Safety in this respect depends largely upon
the use of good judgment in evaluating remaining strength
in the used rope after allowance for deterioration disclosed
Use only wire rope assemblies supplied by our company
since replacement rope assemblies must be of the same
size, grade and construction rope and have the same
swagged end fittings as the original rope assembly.
CAUTION
by inspection. Safety of rope operation depends upon this
remaining strength. Conditions such as the following should
be sufficient reason for questioning rope safety and
consideration of replacement.
1) Twelve randomly distributed broken wires in one rope lay
length or four broken wires in one strand in one rope lay
length. One lay is the length, parallel to the longitudinal
axis, in which a strand makes one complete turn about
the axis of the rope. See Figure 4-4.
2) Two wires broken adjacent at the end fittings.
3) Wear of one-third of the original diameter of outside
individual wires.
4) Kinking, crushing, birdcaging or any other damage
resulting in distortion of the rope structure.
5) Evidence of any heat damage from any cause.
6) Reductions from nominal 1/4 inch diameter to 15/64 inch.
4-6. Hook Throat Opening
Check throat opening as indicated in Figure 4-5. Replace hook
if measurement exceeds the allowable.
Figure 4-4 Basic Components of Wire Rope
Figure 4-5 Hook Throat Opening
*Dimension of throat opening with internal latch.
NOTE: Add 1/16" if measured without hook latch.
14020
14021
For more information contact: Sievert Crane and Hoist, (708) 771-1600, [email protected], www.sievertcrane.com
