Figure 13-39.—Determination of single-choker hitch slingDouble-choker hitch (fig. 13-40): For sling angleof 45 degrees or more, SWL = SWL (ofsingle-vertical hitch) x 3 divided by 4 x H dividedby L x 2.Sling angles of less than 45 degrees, SWL = SWL(of single-vertical hitch) x A divided by B x Hdivided by L x 2.Sling InspectionAll slings must be visually inspected for obviousunsafe conditions before each use. A determination toremove slings from service requires experience andgood judgment, especially when evaluating theremaining strength in a sling after allowing for normalwear. The safety of the sling depends primarily upon theremaining strength. Wire rope slings must beimmediately removed from service if any of thefollowing conditions are present:l Six randomly distributed broken wires in onerope lay or three broken wires in one strand in one layFigure 13-40.—Determination of double-choker hitch sling capacity.13-21
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