ABSTRACT
Steam boilers have been used for many years in industries to run production equipment, drive steam turbines to generate electricity, provide heat to certain processes, steam-clean, and so on. A steam boiler converts water to steam with the heat energy from a fuel source such as oil, gas, and coal. The most common types of boilers are the retube boiler and watertube boilers in which re or hot gases are directed inside retubes and outside watertubes, respectively. In the retube boiler, the retubes are arranged in banks so that the hot gases will pass through the multiple pass retubes before they exit the stack. Water that surrounds the retubes absorb heat from the surface of the tubes. In a watertube boiler, watertubes are arranged in a vertical position. It usually has two or more drums in which the top drum allows the separation of steam whereas the bottom drum collects sludge.
