Question 85Steam Plants - Assistant Engineer

The correct answer is D) remain open or partially open until steam blows through the lines, and then the valves should be closed. When raising steam on a boiler, it is important to properly manage the superheater drains to prevent damage to the system. Keeping the superheater drains open or partially open until steam blows through the lines allows any condensate to be removed, preventing water hammer or other issues that could occur if the drains were closed too soon. Once steam is flowing through the system, the drains can then be closed to maintain pressure and efficiency. The other options are incorrect because they do not properly address the need to remove condensate before closing the drains, or they suggest closing the drains at inappropriate times during the steam-raising process.