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Sling Capacity in accordance with Lifting Equipment Engineers Association (LEEA)

The combined safe working load (SWL) of the lifting arrangement must take account of the angle of the slings by applying an angle factor to both the slings and shackles. The angle factors are given below.
Table 4 in 'Lifting Equipment A User's Pocket Guide' 2011 edition

Angle Factors
Maximum load to be lifted = angle factor x SWL marked on sling
Assumes all the slings are the same SWL.
Combination of SlingsAngle β of sling legs to the vertical
0° < β ≤ 45°45° < β ≤ 60°
1 x sling leg or endless sling0.70.5
2 x sling leg or endless sling1.41
3 x sling leg or endless sling2.11.5
4 x sling leg or endless sling2.11.5
2 x two leg slings1.51.0

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