Question 169Motor Plants - 1st Asst/Chief70% to pass
Which of the listed problems will happen when the water level of a fire-tube type auxiliary boiler approaches the crown sheet?
AI Explanation
The correct answer is A) The fusible plugs will melt.
When the water level in a fire-tube type auxiliary boiler approaches the crown sheet (the top of the furnace), the fusible plugs installed on the boiler will melt. These plugs are designed to melt at a specific temperature, typically around 250°F, to prevent the crown sheet from overheating and potentially causing an explosion.
The other options are incorrect because: B) The furnace will not explode if the fusible plugs function as designed, C) The furnace will overheat if the water level is too low, and D) Excess steam will not be generated if the fusible plugs melt, as this action is intended to prevent further overheating and damage to the boiler.
Related Questions
#167 The thrust bearing shown in the illustration has over eight years of ahead running time. Measurements show "i1" is 4 mm and "i2" is 1mm. Which of the following conditions is indicated and what steps should be taken, if any? Illustration MO-0121 #168 When preparing to light off a cold boiler equipped with a return flow fuel oil system, the recirculating valve directs the flow of oil_______________.#170 Downcomers installed on auxiliary package boilers are protected from direct contact with hot gases by _______________.#171 Which of the following statements concerning fire-tube boilers is correct? #172 Which of the automatic boiler controls listed should be tested prior to lighting off an auxiliary boiler?