Harrington Hoists and Cranes RHN - Rhino Wire Rope Hoist - Manual (Page 44)

44
Table 5-5 Hoist (and Trolley) Inspection Methods and Criteria (continued)
Item Method Criteria Action

The full length of the Wire Rope must be inspected for rope diameter, broken strands or
wires, and condition. The rope must be free of load for testing to detect any broken wires when bending the
rope by hand (especially by radius of rope sheeve). Special care should be taken when inspecting sections
of rapid deteriation, such as the following:
 sections in contact with saddles, equalizer sheaves, or other sheaves where the rope travel is limited;
 sections of the rope at or near terminal ends where corroded or broken wires may protrude;
 sections subject to reverse bends;
 sections of rope that are normally hidden during visual inspection, such as parts passing over sheaves.

In certain applications (constant deadweight, recurrent stopping position, automatic
operation, etc.) wire fractures may occur inside the rope without being visible from outside.
Any condition that could degrade the strength and performance of the wire rope must be reported to a
qualified person for evaluation and disposition.
Wire Rope
Diameter Measure, Visual Any reduction in the diameter of the wire rope
must not be reduced due to corrosion, wear or
core collapse more than the discard value in
Table 5-7 . The outer wires should not be worn
more than 10% of their original diameter.
Replace. Inspect
drum and all
sheaves.
Wire Rope –
Broken
Wires or
Strands Visual The wire rope should be inspected for broken
wires or strands, paying close attention to end
connection and sections that frequently pass over
sheaves. The rope must NOT have:
 More than the Maximum number of broken
wires listed in Table 5-7 .
 More than 4 broken wires in 1 strand in one
lay (one full revolution of a strand around the
rope).
 Any broken strands.
Replace
Wire Rope –
Condition Visual  Any wire rope deformation with permanent
bends, flattening, unraveling, birdcaging, etc.
 General corrosion.
 Rope core exposure.
 One or more loose or protruding strands or
wires from rope.
 Severely corroded or broken wires at end
connections.
 Severely corroded, cracked, bent, worn or
improperly applied end connections
 Any evidence of heat damage of any kind.
(Wire rope exhibits any heat discoloration or
localized loss of lubrication).
Replace