STT113 TOWER CRANE OPERATION AND SERVICE MANUAL
10B-8
VI. The discard as useless standard of rope
1. The quality and quantity of broken rope
For six layers and eight layers of ropes, broken rope mostly occurs on the appearance.
And that is difference to wire rope of multi wall wire of rope, broken rope of this wire
rope occurs inside but not to view.
The visible broken ropes are related to the fatigue when the rope must be
scrap in the hoisting machinery.
Table 10-6-1
(n)
the number of out
layer rope load
rope construction
working grade for mechanism M3
～
～
～
～
M8
alternate lay
albert lay
extent
6d
30d
6d
30d
101
～
～
～
～
120
6x19
、
、
、
、
7x19
、
、
、
、
6x(19)
6w(19)
、
、
、
、
34x7
10
19
5
10
221
～
～
～
～
240
6x37
19
38
10
19
Notice:
1.The working grade of mechanism for tower crane is M4.
2.The diameter of wire rope d_
3.Should take out the stuff steel wire from the check number because
can’t make stuff steel wire as load steel wire. The multilayer rope only
consider visible out layer wire of rope, for the rope with the steelcored
don’t consider the rope core and look upon inside wire of rope.
