Unwinding wire rope from its reel also requires careful and proper procedure.
There are three methods to perform this step correctly:
1)
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 work-
man 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.
2) 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 suffi-
cient 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.
3) 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.
Figure 19. The wire rope reel
is
mounted
on
a shaft supported by jacks. This pennits the reel
to rotate freely, and the rope can be unwound either manually
or
by
a powered mechanism.
28 • Wire Rope Technical Board - Wire Rope Users Manual, Fourth Edition
Figure 20. A vertical unreeling stand.
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