Question 149Steam Plants - QMED70% to pass
Which of the valves listed should be closed before lighting off a boiler?
AI Explanation
The correct answer is C) Economizer drain valve.
Before lighting off a boiler, the economizer drain valve should be closed to prevent water from draining out of the system, which could lead to issues during the boiler startup process. The economizer is a heat exchanger that preheats the boiler feed water, and the drain valve is used to remove any accumulated sediment or water from the economizer.
The other options are incorrect because the superheater vent valve, superheater drain valve, and air cock valve are not directly related to the initial boiler lighting process and do not need to be closed before this step.
Related Questions
#147 After a boiler has been taken off the line and is cooling, the air cock is opened to _______________.#148 Which of the following statements about boilers is correct? #150 When raising steam on an idle boiler and the steam pressure has risen to about 5 pounds more than the pressure of the boiler already on the line, you can _______________.#151 Which of the following precautions should be taken prior to lighting off a boiler? #152 While raising steam on a cold boiler, the air cock is to be closed after _______________.