Figure 6-17.Determination of bridle hitch sling capacity.
The rated capacity of any sling depends on the
size, the configuration, and the angles formed by the
legs of the sling and the horizontal. A sling with two
legs used to lift a 1,000-pound object will have 500
pounds of the load on each leg when the sling angle is
90 degrees. The load stress on each leg increases as
the angle decreases. For example, if the sling angle is
30 degrees when lifting the same 1,000-pound object,
the load is 1,000 pounds on each leg. Try to keep all
sling angles greater than 45 degrees; sling angles
approaching 30 degrees are considered
hazardous and must be avoided.
Wire rope slings and associated hardware must be
stored either in coils or on reels, hung in the rigging
loft, or laid on racks indoors to protect them from
corrosive weather and other types of damage, such as
kinking or being backed over. Slings are not to be left
out at the end of the workday.
Chains are made up of links fastened through each
other. Each link is fabricated of wire bent into an oval
and welded together. The weld usually causes a slight