Boilers can be classified in various ways, depending on firing method used, fuel fired, field of application, type of water circulation employed, and pressure of steam. Depending on their construction boilers can be divided into: fire tube boilers (Figure 3.), water tube boilers (Figure 4.).
Fire tube boilers have been used in various early forms to produce steam for industrial purposes. The fire tube boiler is a special form of the shell tube type boiler. A shell type boiler is a closed, usually cylindrical vessel that contains water. Hot gases pass through the tubes during the heat transfer process. The shell boiler evolved into modern forms such as the electric boiler, in which heat is supplied by electrodes embedded in the water.
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