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Proof  Testing  Slings
Figure 13-43.A. Simple tackle; B. Compound tackle.

Equipment Operator Basic - Beginning construction equipment operators manual
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Figure  13-41.—Proof  Test/Inspection  Sheet. Storage Wire rope slings and associated hardware must be stored either in coils or on reels, hung in the rigging loft, or laid on racks indoors to protect them from corrosive weather and other types of damage, such as kinking or being backed over. Slings are not to be left on the crane at the end of the workday. MECHANICAL, ADVANTAGE The push or pull a human can exert depends on the weight and strength of that individual. To move any load heavier than the amount you can physically move, a mechanical  advantage  must  be  used  to  multiply  your power. The most commonly used mechanical devices are block and tackle, chain hoist, and winches. Figure 13-42.—Parts of a fiber line block. BLOCK  AND  TACKLE A block (fig. 13-42) consists of one or more sheaves fitted in a wood or metal frame supported by a shackle 13-23







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