Question 208Motor Plants - 1st Asst/Chief

The correct answer is C) secure both the fires and the feed inlet valve. When a tube ruptures in a water-tube auxiliary boiler due to low water, the immediate action should be to secure both the fires and the feed inlet valve. This is to prevent further damage to the boiler and potential explosion hazards. Continuing to feed water to the boiler when the water level is low can actually worsen the situation, as the sudden addition of cold water can cause thermal shock and further damage to the boiler. The other options are incorrect because A) maintaining feed water with low water level can exacerbate the problem, B) allowing the water level to fall out of sight is extremely dangerous, and D) waiting for a 50% pressure drop is too late and puts the boiler at high risk of failure.