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Inspection and maintenance
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07.2020
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7.19.2
Replacement of wire rope due to broken wires
The part number of the rope is listed in the works certificate.
Wire ropes must be replaced if one of the following criteria applies.
The listed criteria are examples derived from the standard
ISO 4309 2017-11 Cranes -
Wire ropes - Care and maintenance, inspection and discard
.
Corrosion
In order to distinguish between corrosion of the wires and the rope surface:
➢
Wipe off or brush off the rope sections to be checked.
➢
Check the wire rope for corrosion in accordance with the following table and replace if
necessary.
Type of corrosion
Condition
Classification of the degree of severity
External corrosion
Wire surface heavily corroded, wires loose.
Replacement necessary with 100 %
Internal corrosion
Clear visible signs of internal corrosion, e.g.
corrosion particles emerging.
Replacement necessary with 100 %
Fretting corrosion
Reddish brown dust between the strands,
which almost covers the entire outer surface.
Replacement necessary with 100 % or with uncertainty
regarding the degree of severity
Reduction in rope diameter
➢
Replace wire ropes with the following even reductions in the rope diameter (as % of
the nominal diameter).
≤ 10
% with single-layer ropes with fibre core
≤ 7.5
% with single-layer ropes with steel core or ropes stranded in parallel
≤ 5
% with rotation resistant ropes
Local reduction of the rope diameter
➢
Replace wire ropes with visible local reductions (constrictions).
Corkscrew-like deformations
➢
Replace wire ropes with corkscrew-like deformations of more than 1/10 of the rope
diameter.
Bird-caging
➢
Replace wire ropes with bird-caging.
Protruding or deformed cores or strands
➢
Replace wire ropes with protruding or deformed cores or strands.
