What is the work of fusible plug?
The function of fusible plug is to protect the boiler from damage due to overheating of boiler tubes by low water level. it is simply a hollow gun metal plug screwed into the fire box crown. This hollow gun metal plug is separated from the main metal plug by an annulus fusible material.
What kinds of metal in the fusible plug melts when overheating occurs?
A proper material for fusible plugs is commercial tin, the melting point of which is about 450 degrees F, or an alloy of two parts of lead and one of tin, having a melting point of 440 degrees F. In some places the law requires the use of Banca tin in fusible plugs. This metal has a melting point of 450 degrees F.”
What is a fusible plug in a refrigeration system?
Fusible plugs are sometimes fitted to the receivers of air compressors as a precaution against the ignition of any lubricating oil vapour that might be present. Should the action of the compressor heat the air above a safe temperature the core will melt and release the pressure.
What are fusible gases?
The fusible plug releases the gas before the hazardous reaction can begin. Fusible plugs are made of metals that melt at low temperatures. For example, acetylene cylinders have a fusible plug which melts at about 100°C (212°F).
Where is a fusible plug fitted?
Fusible plug is a safety device used to extinguish the fire in the furnace of the boiler when the water level falls too much below the normal level. It is fitted over the crown of the furnace or the combustion chamber.
What temperature does a fusible plug melt?
Answer: The answer is A, melt between 158-165°F. The fusible plugs found on chlorine cylinders, ton containers and larger containers are designed to melt and allow the pressure inside the container to decrease to safer levels.
Is fusible plug used in water tube boiler?
Fusible Plug is a fitting used in Steam Boilers to enhance the safety during operation. It’s working depends upon the water level in the Boiler shell. It is a threaded metallic cylindrical object, with a tapered hole in it which goes through its entire length.
When a fusible plug in a cylinder melts what happens to the refrigerant?
Also, the release of the liquid chlorine will expand to a gas about 460 times causing a very dangerous situation for first responders and emergency personnel. The fusible plug is made of a metal alloy designed to melt. Once the plug melts away, the gaseous chlorine will spew out of the small hole.
What is a fusible plug in a boiler?
Fusible Plug is a fitting used in Steam Boilers to enhance the safety during operation. It’s working depends upon the water level in the Boiler shell. It is a threaded metallic cylindrical object, with a tapered hole in it which goes through its entire length. It is usually of brass, bronze or even gunmetal.
What is the function of fusible plug Mcq?
Explanation: The function of the fusible plug is to protect the fire tube from burning due to excessive heating.
Is fusible plug boiler mounting?
Fusible Plug is one of the boiler mountings. Below shows the functions, position, constructions & working principle of a fusible plug in a boiler. Functions of a fusible plug: ➦ It is very important safety device of a steam boiler, which protects the fire tube boiler against overheating.