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Figure  13-34.Using  spreader  bars
Figure  13-38.-Determination  of  double-basket  hitch  sling  capacity.

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure 13-36.-Determination of bridle hitch sling capacity. Spreaders Bars spreaders end connection should be the same as the thickness  of  the  shackle  pin. In  hoisting  with  slings,  spreader  bars  are  used  to prevent crushing and damaging the load. Spreader bars are short bars, or pipes, with eyes fastened to each end. By setting spreader bars in the sling legs above the top of the load (fig. 13-34), you change the angle of the sling leg and avoid crushing the load particularly in the upper portion. Spreader  bars  are  also  used  in  lifting  long  or oversized objects to control the sling angle, as shown in figure 13-35. When spreader bars are used, make sure you do not overload the end connection. A spreader bar has a rated capacity that is the same as hooks and shackles. A good rule of thumb is the thickness of the Sling Safe Working Loads Formulas for estimating the loads for most sling configurations have been developed. These formulas are based on the safe working load of the single-vertical hitch of a particular sling. The efficiencies of the end fittings  used  also  have  to  be  considered  when determining  the  capacity  of  the  combination. The formula used to compute the safe working load (SWL) for a bridle hitch with two, three, or four legs (fig. 13-36) is SWL (of single-vertical hitch) times H (Height) divided by L (Length) times 2 = SWL. When 13-19







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