18.5.6 Rating for Various Modes of Use
The geometry of the slinging arrangement, i.e. mode of use, calls for a further factor to be applied to the marked SWL to arrive at the maximum load that may be lifted by the sling in a particular configuration. (See Figure 18.5.6-1 and Figure 18.5.6-2 )
Figure 18.5.6-1 A. Straight pull Maximum load = marked SWL. B. Choke hitch Maximum load = 0.8 x marked SWL. C. Basket hitch Maximum load = 1.4 x marked SWL (max angle to vertical 45°)
Figure 18.5.6-2 A. Basket hitch Maximum load = 2 x marked SWL. B. Two leg Maximum load = marked SWL. C. Four leg Maximum load = marked SWL.
The maximum load that may be lifted by a sling in choke hitch is 0.8 x marked SWL. If the sling is used in basket hitch, no part of the sling should be disposed at a greater angle than 45° to the vertical, i.e. the maximum angle between the parts of the sling is 90° and the maximum load that may be lifted is 1.4 x marked SWL. Where a sling is used in basket hitch and the parts of the sling are parallel, the maximum load that may be lifted is 2 x marked SWL.