A good method for unreeling wire rope is to run a
pipe or rod through the center and mount the reel on
drum jacks or other supports so the reel is off the
ground, as shown in figure 6-40. In this way, the reel
will turn as the rope is unwound, and the rotation of the
reel helps keep the rope straight. During unreeling, pull
the rope straightforward, and avoid hurrying the
operation. As a safeguard against kinking, NEVER
unreel wire rope from a reel that is stationary.
To uncoil a small coil of wire rope, simply stand
the coil on edge and roll it along the ground like a
wheel, or hoop, as also shown in figure 6-40. NEVER
lay the coil flat on the floor or ground and uncoil it by
pulling on the end, because such practice can kink or
twist the rope.
KINKS.One of the most common forms of
damage resulting from improper handled wire rope is
the development of a kink. A kink starts with the
formation of a loop, as shown in figures 6-41 and 6-42.
A loop that has not been pulled tight enough to set
the wires or strands or the rope into a kink can be
removed by turning the rope at either end in the proper
direction to restore the lay (fig. 6-43). If this is not done
and the loop is pulled tight enough to cause a kink (fig.
6-44), the kink will result in irreparable damage to the
rope (fig. 6-45).
Figure 6-40.Unreeling wire rope (left); uncoiling wire rope
Figure 6-41.Improper handling.
Figure 6-42.Wire rope loop.
Figure 6-43.The correct way to take out a loop in a wire
Figure 6-44.Wire rope kink.
Figure 6-45.Kink damage.
Kinking can be prevented by proper uncoiling and
unreeling methods and by the correct handling of the
rope throughout its installation.
DRUM WINDING.Spooling wire rope on a
crane hoist drum causes a slight rotating tendency of
the rope due to the spiral lay of the strands. Two types