Auxiliary Hoisting Lines
Sheaves
Check structural members used to support sheave installations for cracks, deformities, and wear. The sheave should hang freely and be able to turn as needed when under load. Inspect the spindle or mandrel in the swivel assembly for wear. Shackles used to hang the sheave must be of the 4-part type with bolt and locking pin. Screw pin type shackles should not be used in overhead applications. Check that safety cables are installed where they do not interfere with the normal operation of the sheave.
Routing
Check that the routing of the hoist cable runs freely without excessive contact with structural components of the mast. Pay particular attention to areas around the racking board and fingers where the cable can become trapped and cause excessive wear to the fingers and cable. Check equipment to see if hoist lines have been in contact with them. Top drive drilling units, rotary hose and service loop clamps, and stabbing boards can all be damaged by, or cause damage to, hoisting lines.
Knowledge Check Choose the best answer for the question.
6-2. Where must particular attention be given when routing hoist cables on the rig?
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