UNREELING AND UNCOILING
Wire rope is shipped in cut lengths, either in coils or on reels. Great care
should be taken when the rope is removed from the shipping package since it can
be permanently damaged by improper unreeling or uncoiling. Looping the rope
over the head of the reel or pulling the rope off a coil while it is lying on the
ground, will create loops in the line. Pulling on a loop will, at the very least, produce
imbalance in the rope and may result in open or closed kinks (Fig. 18).
Once a rope is kinked, the damage is not repairable. The kink must be cut out or
the rope is unfit for service.
Unwinding wire rope from its reel also requires careful and proper procedure.
There are three methods to perform this step correctly:
- The reel is mounted on a shaft supported by two jacks or a roller payoff (Fig.
19). Since the reel is free to rotate, the rope is pulled from the reel by a workman
holding the rope end, and walking away from the reel as it unwinds. A
braking device should be employed so that the rope is kept taut and the reel is
restrained from over-running the rope. This is necessary particularly with
powered de-reeling equipment.
- Another method involves mounting the reel on an unreeling stand (Fig. 20). It
is then unwound in the same manner as described above (1). In this case,
however, greater care must be exercised to keep the rope under tension sufficient
to prevent the accumulation of slack. Slack can allow the rope to drop
below the lower reel head and be damaged or loose wraps on the reel to fall
over the rope coming off the reel and become tangled.
- In another accepted method, the end of the rope is held while the reel itself is
rolled along the ground. With this procedure, the rope will payoff properly
however, the end being held will travel in the direction the reel is being rolled.
As the difference between the diameter of the reel head and the diameter of
the wound rope increases, the speed of travel will increase.
Never Exceed the Working Load Limit!