1. vb. [Drilling] To replace replace the drilling line wrapped around the crown block crown block and and traveling block. As a precaution against drilling line failure due to fatigue, the work done by the drilling line is closely monitored and limited. The work is commonly measured as the cumulative product of the load lifted in tons! and the distance lifted or lowered in miles!. After a predetermined limit of ton"miles, new line is unspooled from the storage reel reel and and slipped through the crown block and traveling block sheaves and drawworks spool, with the e#cess on the drawworks spool end cut off and discarded. drawworks,, sheave sheave,, traveling block See: crown block , drawworks
Cutting off a Drilling Line: Safe Procedures $or many years drilling contractors have e#tended 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 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. %f the line line becomes too badly worn, it should should be cut off off or changed when noticed. %n preparation for cutting slipping! the drilling drilling line, employees should be aware of the potential ha&ards, including but not limited to' 1. $all from from height' wear wear proper fall fall protection protection full full body harness! harness! and utili& utili&ee 1(() tie off. off. *. +oisting +oisting personn personnel el into into the the derrick derrick may result result in falls, caught in, caught between: use full body harness type boatswains chair or work basket!, use personnel hoisting procedures, be sure the winch operator has full view of the person being hoisted at all times. The winch operator must stay at winch at all times when a person is being hoisted, held in position, or lowered. -. truck truck by' be aware aware of potential potential dropped dropped from the the derrick, derrick, stay out out from below below derrickman when he is tying off the blocks, take care when removing the drilling line form the drum, be aware of use u se of tools while tightening the clamps on the line drum and dead line!. /. lip0$all lip0$all while while removing removing drilling drilling line from from drum0rig drum0rig floor' floor' be aware of footing, footing, keep deck clear of tripping ha&ards, use a rig floor winch to let the cut off line down from the rig floor. . 2iscommunica 2iscommunication' tion' hold hold a pre"3ob pre"3ob safety safety meeting meeting to discuss discuss each member memberss responsibilities, assign a signal man for tasks that re4uire hoisting operations.
5hen getting ready to cut off the drilling line, the traveling block should be hung in the derrick on block hanging lines! that hang from the crown. The hanging line should be rated for the weight of the blocks plus an ade4uate safety factor check with wire rope manuf acturer!. The T%5 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 boatswains chair or derrick work basket!. The driller should be at the master clutch. 6nce the derrickman has attached the hanging lines! to the blocks, he should return to the drill floor. 5hen removing the blocks hanging lines! after the drill line is cut and slipped, the derrickman should utili&e a boatswains chair and air hoist line to reach the hanging lines!. 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 boatswains chair. The man that secured the hang"line should climb down the derrick ladder using a safe climbing device. +e should never slide down the dead line. 1. 7emove the e#cess worn line from the drum and cutoff as planned. Always use a wire line cutter. Never use a hatchet or sharp tool . 5ear eye protection chipping goggles! in addition to this check. *. 8lamp the drum end of the line back into the drum and tighten the drum clamp as tightly as possible. -. 9oosen the clamps on the wire line anchor and slip through as much line as is needed to put the desired wraps on the drum. 8are should be taken to ensure that the warps are tight and together. /. Tighten the wire line clamps on the anchor, pick up traveling block and remove the hanging lines! from block. The hanging lines! should be tied back in the corner of the derrick out of the way of the blocks and ready for use the ne#t time the line is slipped or cut off. . 7echeck all clamps and position of line and start in hole with a safe drilling line. :. 7einstall the crown protection device if it was removed. Ad3ust as necessary to stop the blocks as re4uired. ;. 7einstall the guard on the front of the drawworks. <. 7einstall the weight indicator sensor on the dead line and remove the T%5 valve.
