How Lifting Slings are Rigged?

Choke

Using the sling as a choker reduces its rated capacity. Rating in the following sling charts have lower capacity for choker hitches than vertical loading to reflect this.When using a choker sling at an angle of less than 120 degrees(see drawing) the choker rated capacity must be reduced.

Basket

A basket hitch equally distributes the load between the two legs of a sling. Consideration must be given to the angles created in basket hitches since they reduce the rated capacity.

(See “How Angles Effect Sling Stress” below)

As the angle between the legs of the sling increase, the load each leg has to lift increases. This applies to a single sling used in a basket hitch as well as a multi-leg sling or bridle. See illustration below.

1.First, divide the total load to be lifted by the number of legs to be used. This provides the load per leg if the lift were being made with all the legs lifting vertically.

2.Determine the angle between the legs of the sling and the vertical.

3.Then MULTIPLY the load per leg by the Load Factor for the leg angle being used (from the table at right) to compute the ACTUAL LOAD on each leg for this lift and angle.

NOTE: THE ACTUAL LOAD MUST NOT EXCEED THE RATED SLING CAPACITY.

4.Example: In drawing three (sling angle of 45 degrees):

1000 ÷ 2 = 500kg ( Per Leg if a vertical lift)