Important Terms for Steam Boilers:
Though there are many terms used in steam boilers, yet the following are important from the subject point of view:
🔹 It is made up of steel plates bent into cylindrical form and riveted or welded together.
🔹 The ends of the shell are closed by means of end plates.
🔹 A boiler shell should have sufficient capacity to contain water and steam.
🔹 It is the space, generally below the boiler shell, meant for burning fuel in order to produce steam from the water contained in the shell.
⤷ Grate:
⤷ Furnace:
⤷ Heating Surface:
⤷ Mountings:
⤷ Accessories:
🔹 It is a platform, in the combustion chamber, upon which fuel (coal, wood) is burnt.
🔹 The grate generally consists of cast iron bars which are spaced apart so that air (required for combustion) can pass through them.
🔹 The surface area of the grate, over which the fire takes place is called grate surface.
🔹 It is the space, above the grate and below the boiler shell, in which the fuel actually burnt.
🔹 The furnace is also called fire box.
🔹 It is that part of the boiler surface, which is exposed to the fire (or hot gases from the fire)
🔹 These are the fittings which are mounted on the boiler for its proper and safe functioning.
🔹 They include water level indicator, pressure gauge, safety valve etc.
🔹 It may be noted that a boiler cannot function safely without the mountings.
🔹 These are the devices, which form an integral part of a boiler, but are not mounted on it.
🔹 They include superheat, economizer, feed pump etc. It may be noted that the accessories help in controlling and running the boiler efficiency.
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