Question 262General Subjects - QMED
70% to passTo prevent overheating and scoring of the shaft after repacking the stuffing box, which of the following procedures should be carried out?
AOperating the pump slowly and applying oil freely to the shaft until the packing is properly seated.
BTightening the gland in all the way and then backing it off slightly.
CLubricate the lantern ring with cylinder oil before installing new turns of packing.
DTighten the packing in small increments while the pump is operating.
AI Explanation
The correct answer is D) Tighten the packing in small increments while the pump is operating. This is the correct procedure to prevent overheating and scoring of the shaft after repacking the stuffing box. Tightening the packing gradually while the pump is running allows the packing to properly seat and seal around the shaft, preventing excessive friction and heat buildup. The other options are incorrect because: A) Running the pump slowly with oil may not properly seat the packing, B) Fully tightening the gland can over-compress the packing, and C) Lubricating the lantern ring is not the primary step to prevent overheating.
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