Question 152Steam Plants - QMED

The correct answer is B) steam has formed and all air is vented. When raising steam on a cold boiler, the air cock should be closed after steam has formed and all air has been vented from the boiler. This is important to ensure that the boiler is properly pressurized and operating safely. Closing the air cock before the air has been fully vented could prevent the boiler from reaching the desired pressure and temperature. The other answer choices are incorrect because: A) closing the economizer drain is a separate step, not related to closing the air cock; C) lighting the burners and getting them firing normally is also a separate step; and D) cutting the boiler in on the line is a later step that occurs after the air has been vented.