Double-Choker Hitch (fig. 3-27): For slingangle of 45 degrees or more, SWL = SWL (ofsingle-vertical hitch) x 3 divided by 4 x Hdivided by L x 2.Sling angles of less than 45 degrees, SWL =SWL (of single-vertical hitch) x A divided byB x H divided by L x 2.Eye SplicesMost of the attachments used with wire ropeare designed to provide an eye on the end of the wirerope by which the maximum strength of the wire ropecan be obtained when the wire rope is connected to aload. With the exception of some slings, all spicedeyes should incorporate rope thimbles to maintainrope strength and reduce wear. If a thimble is notused, the efficiency of the connection can be reducedby as much as 10 percent because the rope flattensunder the load (fig. 3-28).Figure 3-28.-Wire rope thimble.Every wire rope manufacturer attaches a differentname to its particular type of eye splice; however, there areusually variations in the three basic groups:Figure 3-27.—Determination of double-choker hitch sling capacity.3-26
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