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Figure  13-38.-Determination  of  double-basket  hitch  sling  capacity.
Proof  Testing  Slings

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure  13-39.—Determination  of  single-choker  hitch  sling Double-choker  hitch  (fig. 13-40): For sling angle of  45  degrees  or  more,  SWL  =  SWL  (of single-vertical hitch) x 3 divided by 4 x H divided by L x 2. Sling angles of less than 45 degrees, SWL = SWL (of  single-vertical  hitch)  x  A  divided  by  B  x  H divided by L x 2. Sling Inspection All slings must be visually inspected for obvious unsafe  conditions  before  each  use.  A  determination  to remove slings from service requires experience and good  judgment,  especially  when  evaluating  the remaining strength in a sling after allowing for normal wear. The safety of the sling depends primarily upon the remaining   strength.   Wire   rope   slings   must   be immediately  removed  from  service  if  any  of  the following conditions are present: l Six randomly distributed broken wires in one rope lay or three broken wires in one strand in one lay Figure  13-40.—Determination  of  double-choker  hitch  sling  capacity. 13-21







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