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 A portion of water is discharged when the boiler is in operation to blow out mud scale or sediments periodically, by a:

1.  feed check valve
2.  blow off cock
3. safety valve
4.  fusible plug 

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Correct Answer - Option 2 :  blow off cock


Boiler Mountings: These are the safety devices mounted on boiler shell for its safe working.

 Blow Off Cock

A blow-off cock perform two functions:

  • It may discharge a portion of water when the boiler is in operation to blow out mud, scale or sediments periodically.
  • It may empty the boiler when necessary cleaning, inspection and repair is required.
  • Fitted in boiler shell at the lowest part of water space.

 Feed check valve

The function of a feed check valve is

  • To control the supply of water to the boiler
  • To prevent the escaping of water from the boiler when the pump pressure is less or the pump is stopped.

It is fitted in the water space of the boiler slightly below the normal level of the water.

 Safety Valve

  • The function of safety valve is to release the excess steam when the pressure of steam inside the boiler exceeds the rated pressure.
  • Safety valve generally mounted on the top of Shells.
  • As per boiler regulations, every boiler must have two safety valves.

 Fusible Plug

  • The function of a plug is to protect the boiler against damage due to overheating for low water level.
  • It is fitted tire box crown plate or over the combustion chamber.

 Junction or Stop Valve

  • A junction valve is a valve which is placed directly over a boiler and connected to a steam pipe which carries steam to the engine.
  • The function of stop value is to regulate the flow of steam from one steam pipe to the other or from the boiler to the steam pipe.

 Pressure Gauge

  • The function of a pressure gauge is to measure the pressure exerted inside the vessel. The gauge is mounted on the front top of the shell.


Boiler Accessories: These are used in increasing efficiency of the plant.

Economiser An economiser is a device in which the waste heat of the flue gases is heating the feed wat

Air Preheater

The function of the air preheater is to increase the temperature of air before it enters the furnace.

It is generally placed after economiser so that flue gases pass through the economiser and then to air preheater


The function of a superheater is to increase the temperature of the steam above its saturation point.

Superheaters are located in the path of furnace gases so that heat is recovered by the superheater from the hot gases.

Steam Separator

The function of steam separator is to remove the entrained water particle from the steam conveyed to the turbine.

Steam Trap

Its function is to drain away automatically the condensed steam from the steam pipes

Feed Pump

It is used to deliver feed water to the boiler.

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