STT113 TOWER CRANE OPERATION AND SERVICE MANUAL
10B-11
attrition reach diameter 40% and even not found the broken fiber when the rope
diameter decrease 7% or more relative to nominal diameter.
9.
Outside and inside corrosion:
a).
Outside corrosion:
The corrosion outside the rope can observe by naked eye. The rope should discard
as useless when the surface appears chasm and rope quite loosens.
b).
Inside corrosion:
Check up the inner of rope, the rope should discard as useless if it confirmed inner
corrosion badly.
10.
Distortion
The ropes lose the normal switch and produce the visible freak owing to mechanical
damage or local fatigue in rope using, which can result in rope inner distributor of
stress asymmetry, familiar there are: undulation, cage shape distortion(appear in
multilayer enwind rope) steel wire force out, rope diameter local accretion, kinking,
rope diameter local minish, part crushed and kink. The rope should discard as
useless when appear above phenomena.
11.
The vitiate resulting by heat or electric arc effect
:
The surface of rope in annealed condition duo to the heat factor, the rope discard as
useless on account of electrical are welding contact, broken wire and broken wing
of rope.
