For many years drilling contractors have extended the life of their drilling lines by moving the areas of wear toward the drum to be cut off. The proper time to slip or cut off line on the drum end varies on different rigs.
The crews should remember whatever cut-off procedure they are using, visual inspection should come first. If the line becomes too badly worn, it should be cut off or changed when noticed. In preparation for cutting (slipping) the drilling line, employees should be aware of the potential hazards, including but not limited to:
When getting ready to cut off the drilling line, the traveling block should be hung in the derrick on block hanging line(s) that hang from the crown. The hanging line should be rated for the weight of the blocks plus an adequate safety factor (check with wire rope manufacturer).
The TIW valve should be installed in the drill pipe prior to hanging off the blocks and the elevators attached to the pipe in the hole.
The derrickman should get to the traveling block by means of the air hoist line with a boatswain’s chair (or derrick work basket). The driller should be at the master clutch. Once the derrickman has attached the hanging line(s) to the blocks, he should return to the drill floor. When removing the blocks hanging line(s) after the drill line is cut and slipped, the derrickman should utilize a boatswain’s chair and air hoist line to reach the hanging line(s). After he has disengaged the hang-line from the block, he should swing the hang-line to a man in the derrick corner to be secured. The man in the derrick who is to secure the hang-line should have fall protection harness and be secured to the derrick at all times. The derrickman should then return to the floor by the boatswain’s chair. The man that secured the hang-line should climb down the derrick ladder using a safe climbing device. He should never slide down the dead line.
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