Question 210Steam Plants - Assistant Engineer

The correct answer is A) The fusible plugs will melt. In a fire-tube type auxiliary boiler, the crown sheet is the top of the furnace. As the water level approaches the crown sheet, the fusible plugs installed on the crown sheet will melt, allowing the steam and water to escape and preventing the furnace from overheating and potentially exploding. This is a safety feature designed to protect the boiler and prevent catastrophic failure. The other options are incorrect because: B) The furnace will not explode if the fusible plugs function as intended, C) Excess steam will not be generated, and D) The furnace will not overheat if the fusible plugs melt and release the steam and water.