Question 334Steam Plants - 1st Asst/Chief70% to pass
Excessive thrust bearing wear in a main propulsion turbine rotor should FIRST become apparent by _______________.
AI Explanation
The correct answer is A) taking rotor position indicator readings.
Excessive thrust bearing wear in a main propulsion turbine rotor will first become apparent by changes in the rotor position indicator readings. As the thrust bearing wears, the rotor will gradually shift its axial position, which will be detected by the rotor position indicator before other symptoms become noticeable.
The other answer choices are incorrect because: B) metal particles in the lube oil purifier would be a later symptom, C) rubbing noises when jacking over the main unit would indicate more severe wear, and D) an intermittent vibration when changing speed could have various causes unrelated to thrust bearing wear.
Related Questions
#332 An unusual vibration in the main propulsion turbine unit, accompanied by a rumbling sound in the reduction gear, could be caused by _______________.#333 Raising vacuum on a main turbine unit without using the turning gear will result in _______________.#335 If the main propulsion turbine begins to vibrate severely while you are increasing speed, you should _______________.#336 A common cause of the Babbitt linings cracking in a turbine journal bearing is from _______________.#337 When a turbine bearing shows signs of overheating, you should _______________.