Q 1. What is the function of fusible plug?
Ans. Overheating damage to the boiler is prevented by fusible plug. Overheating occurs when water level is low. It Is fitted above the fire box. When water level falls below the level of fusible plug, it is exposed to steam and it melts. Steam and water rush to the fire box and extinguish the fire which prevents overheating of boiler.
Q 2. A fusible plug melting point?
Ans. The melting point of fusible plug should be less than the temperature of the steam getting generated, since the fusible plug is supposed to melt when it comes in contact with the steam. Fusible plugs should usually be replaced after a period of about 2 years.
Q 3. In fusible plug, the fusible metal is protected?
Ans. The fusible metal is to be melted only by the steam and not by the hot gases released from the combustion in the fire box. The fusible metal is therefore protected from fire by flange on the hollow gun metal plug.
Q 4. Purpose of blow-off cock in boiler?
Ans. Blow-off cock is used to remove or blow out mud, sediments and scales that had settled down at the bottom of the boiler. Also it is used to empty the boiler when it is required to be cleaned.
Q 5. A fusible plug should be replaced ?
Ans. Fusible plugs should usually be replaced after a period of about 2 years.
Q 6. What is the function of a feed check valve? how it work
Ans. The function of feed check valve is to control the supply of water to the boiler. It also prevents the back flow of water when the pump is switched-off. It is installed slightly below the normal water level in the water space. Check valve moves up and down automatically under the pressure of water on its gun metal seat.
Q 7. Feed check valve is mounted at?
Ans. The feed check valve is mounted in the water space slightly below normal level of water. It controls the flow of water in the boiler and also prevents the back-flow of water from the boiler back to the pipe when the pump is switched off.
Q 8 A boiler mountings are provided for?
Ans. Boiler mountings are attached for safe operation of the boiler. Steam stop valve, Man hole and pressure gauge are boiler mountings.
Q 9. What is junction valve and stop valve used in boiler?
Ans. The smaller diameter valve that connects boiler and steam pipe is called stop valve and the larger one is called junction valve. It is mounted on top of the boiler shell. It is used to regulate the flow of steam outside the boiler.
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