A rig must hoist a load of 200,000 lbf. The drawworks can provide a maximum input...

  

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A rig must hoist a load of 200,000 lbf. The drawworks can provide a maximum input power of 800 hp. Ten lines are strung between the crown block and the traveling block and the dead line is anchored to a derrick leg on one side of the v-door (Fig. 1.17), a. Calculate the static tension in the fast line when upward motion is impending. Answer: 24,691 lbf. b. Calculate the maximum hook horsepower available. Answer: 648 hp. c. Calculate the maximum hoisting speed. An- swer: 106.9 ft/min. d. Calculate the derrick load when upward motion is impending. Answer: 244,691 lbf. e. Calculate the maximum equivalent derrick load. Answer: 280,000 lbf. f. Calculate the derrick efficiency factor. Answer: 0.874. Derrick Leg A B Dead Line Lines to Riock Fast Line D Figure 1 Table 1 Number of lines Efficiency 6 8 10 0.874 0.841 0.810 0.770 0.740 12 14 A rig must hoist a load of 200,000 lbf. The drawworks can provide a maximum input power of 800 hp. Ten lines are strung between the crown block and the traveling block and the dead line is anchored to a derrick leg on one side of the v-door (Fig. 1.17), a. Calculate the static tension in the fast line when upward motion is impending. Answer: 24,691 lbf. b. Calculate the maximum hook horsepower available. Answer: 648 hp. c. Calculate the maximum hoisting speed. An- swer: 106.9 ft/min. d. Calculate the derrick load when upward motion is impending. Answer: 244,691 lbf. e. Calculate the maximum equivalent derrick load. Answer: 280,000 lbf. f. Calculate the derrick efficiency factor. Answer: 0.874. Derrick Leg A B Dead Line Lines to Riock Fast Line D Figure 1 Table 1 Number of lines Efficiency 6 8 10 0.874 0.841 0.810 0.770 0.740 12 14

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