[RIGGER’S CORNER] < Continued from page 79.
Use the rigging card panel to the left to select the correct size carbon shackles to be used at the top of the rigging triangle and at the load connections for the application depicted in Figure A.
Use the rigging card panel to the left to select the correct size eye bolts and or hoist rings for the application depicted in Figure A.
The correct answers are:
Top shackle: Minimum of 7/8" diameter with W.L.L. of 6.5 tons. We need a shackle that has a WLL greater than 5 tons (total load to be lifted plus weight of rigging gear etc.) and preferably has a diameter bigger than the diameter of the wire rope.
Bottom shackles at load connection: Minimum of 5/8" diameter with W.L.L. of 3.25 tons. We need shackles at load connections that have WLL’s greater than the sling tension of 5,775 lbs. (1.155 x 5,000lbs = 5,775 lbs.) and preferably has a diameter greater than the diameter of wire rope.
Eye bolts: Minimum size: S-279 7/8". T e in line W.L.L. of this eye bolt is 10,600 lbs, but when subjected to the 60 degree horizontal sling angle the eye bolt loses 35 percent of its capacity. In summary, we need an eye bolt that can handle the sling tension of 5,775 lbs. after its W.L.L. has been adjusted for the sling angle.
Hoist Ring: HR-125 3/4" is rated for maximum of 7,000 lbs. or 3.5 tons. We need a hoist ring that has W.L.L greater than the sling tension of 5,775 lbs. A properly installed HR-125 Hoist Ring keeps its full working load limit regardless of the horizontal sling angle. ❙
80 MAY-JUNE 2012 WIRE ROPE EXCHANGE
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