Question 711Steam Plants - Assistant Engineer70% 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 B) astern throttle valve.
When starting up a main propulsion turbine, steam should first be admitted to the rotor through the astern throttle valve. This allows the turbine to be gradually warmed up and brought up to operating speed in the astern direction before switching to the ahead direction. Admitting steam through the ahead throttle valve could potentially cause thermal damage to the turbine components if the rotor is not properly warmed up.
The other options are incorrect because the ahead throttle valve (A) is used to admit steam for ahead operation, the LP turbine bleed valve (C) and HP turbine bleed valve (D) are used for other purposes and not for the initial warm-up of the turbine.
Related Questions
#709 Operating a steam turbine propulsion unit at medium-speed, in an area with extremely cold sea water and the main circulating pump providing full cooling water flow to the condenser will result in _______________.#710 The most critical period of main turbine operation is during cold start-up, rather than hot shutdown because _______________.#712 Which of the listed procedures should be followed when raising vacuum on the main propulsion plant prior to getting underway? #713 Prior to rolling the main turbines in preparation for getting underway, you should _______________.#714 Before placing the jacking gear in operation on a main turbine unit, you must always insure that _______________.