Question 346Steam Plants - 1st Asst/Chief70% to pass
After properly lining up the main propulsion turbine for warm up, steam should first be admitted to the rotor through the _______________.
AI Explanation
The correct answer is D) astern throttle valve.
When properly lining up the main propulsion turbine for warm-up, steam should first be admitted to the rotor through the astern throttle valve. This allows the turbine rotor to gradually warm up and expand, preventing thermal stresses that could damage the turbine. The astern throttle valve controls the flow of steam to the astern section of the turbine, which is necessary for the initial warm-up process.
The other answer choices are incorrect because the HP turbine bleed valve, ahead throttle valve, and LP turbine bleed valve are not involved in the initial warm-up process. These valves serve other functions related to the operation of the turbine, but do not handle the initial admission of steam during the warm-up phase.
Related Questions
#344 To prevent damage to the turning gear mechanism, which of the following procedures must be carried out before the turning gear is engaged? #345 In securing the main turbines, steam to the second stage air ejectors should be left on for a short period of time in order to _______________.#347 With vacuum up and the main propulsion turbine standing by while awaiting engine orders, it is necessary to roll the unit alternately ahead and astern every five minutes to _______________.#348 Prior to rolling the main turbines in preparation for getting underway, you should _______________.#349 Before placing the jacking gear in operation on a main turbine unit, you must always insure that _______________.