Functions of Boiler Accessories on a steam boiler?


Boiler Accessories: These are the devices which are used as integral parts of a boiler and help in running efficiently.

  • Feed pump
  • Super heater
  • Economiser
  • Air Preheater
  • Injector


Accessories Descriptions:

       1. Feed pump

It is used to deliver water to the boiler. A feed pump may be of centrifugal type or reciprocating type. But a double acting reciprocating pump is commonly used as a feed pump.

      2. Super heater

It is an important devices of a steam generating unit. Its purpose is to increase the temperature of saturated steam without raising its pressure. It is generally an integral part of a boiler and is places in the path of hot flue gases from the furnace.


  • Steam consumption of the engine is reduced.
  • Losses due to the condensation in the cylinders and steam pipes are reduced.
  • Efficiency of the steam plant is increased.

      3. Economiser

An Economiser  is a device used to heat feed water by utilizing the heat in the exhaust flue gases before leaving through the chimney.


  • There is about 15-20% of coal saving
  • It increases the steam raising capacity of a boiler
  • Its prevents formation of scale in boiler water tubes, because the scale now formed in the economiser tubes, which can be cleaned easily.

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