Product Manual
42
WIRE ROPE REPLACEMENT CRITERIA:
If any cable is found to be in need of replacement, the entire
cable set, pulleys and safety rollers must be replaced
immediately.
See cable conditions guide.
In the following table, "lay" means the distance
measured along a line parallel to the axis of the
rope in which the strand makes one complete turn
about the axis of the rope, or the wires make a
complete turn about the axis of the strand.
WIRE ROPE INSPECTION
Inspect wire rope cables for wear or damage. Wipe cables with a rag to detect
hard to see small broken or frayed cable strands. See chapter
9.2, Fig.75
and
ANSI/ALI ALOIM standard.
The wire rope must be removed from service if one or more of the following criteria
are met:
1.
More than six randomly distributed broken wires in one rope lay or 6d length.
2.
More than three broken wires in one strand in one rope lay or 6d length.
3.
Three or more broken wires at rope terminations.
4.
One outer wire broken at the point of contact with the core of the rope which has
worked its way out of the rope structure and protrudes or loops out from the rope
structure
5.
Heavy rusting, corrosion, or pitting. A light surface corrosion on outer wires is normal.
6.
Wear or scraping of one-third of the original diameter of outside individual wires
7.
Excessive stretch. It is normal for new cable to require adjustment during “break-in”,
after which small periodic adjustments may be required. However, if a cable that has
been in service for 6 months should suddenly require frequent adjustments or has
used all the cable adjustment available, all cables must be replaced immediately.
8.
Deformed strands, kinking, crushing, bird-caging, or any other damage or distortion
of wire rope structure
9.
Variations in diameter (necking) or any change from normal appearance
10.
Reductions from nominal diameter of more than 1/32" (for cables 3/8" to 1/2" dia.
inclusive)
11.
End attachments cracked, deformed or worn