Question 307Steam Plants - 1st Asst/Chief70% to pass
If a line shaft bearing begins to overheat, the shaft speed should be reduced. If overheating persists, you should then _______________.
AI Explanation
The correct answer is A) apply emergency cooling water externally to the bearing.
If a line shaft bearing begins to overheat, the immediate response should be to reduce the shaft speed to decrease the heat generation. If the overheating persists, applying emergency cooling water externally to the bearing is the proper course of action. This helps dissipate the excessive heat buildup and prevent further damage to the bearing.
Options B, C, and D are incorrect because increasing lube oil pressure, flooding the bearing with higher viscosity oil, or decreasing lube oil pressure, respectively, would not effectively address the overheating issue. Applying external cooling water is the recommended step to take if the overheating persists after reducing the shaft speed.
Related Questions
#305 Considering helical main reduction gearing, what operational anomalies do the following tooth or teeth conditions represent? #306 Which immediate action should you take when the temperature of one line shaft bearing increases above its normal operating temperature? #308 A sequential lift, nozzle valve control bar on a turbo-generator, utilizes which of the following operating principles? #309 Which of the following statements represents the significance of the differential pressure existing between the nozzle block and steam chest of a turbo generator equipped with a lifting beam mechanism? #310 Which of the following is used to hold the poppet valves closed in a turbo-generators nozzle control speed regulator?