Question 365Steam Plants - Assistant Engineer

The correct answer is A) completely fill the boiler with deaerated feed water and maintain a slight pressure. When laying up a water-tube boiler wet, the goal is to prevent corrosion by keeping the entire internal surface submerged and isolated from air. Completely filling the boiler with deaerated (oxygen-free) feed water and maintaining a slight positive pressure achieves this, preventing air from entering the boiler and causing oxidation. The other options are incorrect because they either do not fully submerge the internal surfaces (draining and refilling) or do not maintain a protective pressure (simply filling to steam level).