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When the pressure inside the boiler drum exceeds the desired level, then which of the following devices blows off the excess steam in the boiler?
  • a)
    Stop valve
  • b)
    Blow-off cock
  • c)
    Fusible plug
  • d)
    Safety valve
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
When the pressure inside the boiler drum exceeds the desired level, t...
Boiler mounting: The items which are mounted on the boiler for the safety purpose of the boiler.
Safety valve: It is used to prevent the overheating and overpressure of steam inside the boiler drum. The safety valve allows the blow off an excess quantity of steam from the boiler drum; thus, the pressure in the boiler falls within the safe limit. It is mounted on the top of the boiler.
Fusible plug: A fusible plug made of a low melting point alloy (lead-based) is installed on the roof of the crown in the furnace. If the water level in the shell falls below a certain level, the fusible plug melts due to overheating, and water pours down through the hole formed and puts down the fire.
Feed check valve: It is used to control the water supply to the boiler and prevent the escaping of water from the boiler when the pump pressure is less or the pump is stopped. Feed check valve ensures unidirectional flow.
Steam stop valve: The function of the steam stop valve is to regulate the flow of steam from one steam pipe to the other or from the boiler to the steam pipe in the same direction.
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When the pressure inside the boiler drum exceeds the desired level, then which of the following devices blows off the excess steam in the boiler?a)Stop valveb)Blow-off cockc)Fusible plugd)Safety valveCorrect answer is option 'D'. Can you explain this answer?
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