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1111 IS-17880
operation
rateD CapaCitY
•
Sling legs shall not be kinked or twisted.
(See Figure 11)
•
Slings shall not be dragged on floor.
•
Slings shall be stored in cool, dark, dry areas,
preferably on racks.
Figure 11
Using slings at an angle can become deadly if that angle is not taken into consideration when selecting the sling to
be used. The tension on each leg of the sling is increased as the angle of lift, from horizontal, decreases. It is more
desirable for a sling to have a larger angle of lift, approaching 90°. Lifts with angles of less than 30° from horizontal
are not recommended. If you can measure the angle of lift or the length and height of the sling as rigged, you can
determine the properly rated sling for your lift.
What would be the rating of each sling rigged at this angle?
1. Calculate the Reduction Factor [RF].
a. Using the angle from horizontal, read across
the Angle Chart (see page 4) to the
corresponding number of the Reduction
Factor column.
- OR -
b. Divide sling height* [H] by sling length* [L].
2. Reduction Factor [RF] x the sling’s rated capacity
for the type hitch that will be used = Sling’s
Reduced Rating.
* Measured from a common horizontal plane to the hoisting hook.
What Capacity sling do i need?
1. Determine the weight that the sling will be lifting [LW].
2. Calculate the Tension Factor [TF].
a. Using the angle from horizontal, read across
the angle chart to the corresponding number
of Tension Factor column.
- OR -
b. Divide sling length* [L] by sling height* [H].
3. Lifting Weight [LW] x the Tension Factor [TF] = Minimum
Sling Rating for the type of hitch that will be used.
* Measured from a common horizontal plane to the hoisting hook.
Angle from
Horizontal
90
◦
Choker Hitch
Vertical Basket Hitch
Vertical Hitch
