Fire-tube boiler components are shown in Figure 6. A
fire-tube boiler is a type of boilers in which hot gases
from the fire pass through one or more tubes within the
boiler. It is one of the two major types of boilers, the
other being the water tube boiler. A fire tube boiler can
be either horizontal or vertical. A fire-tube boiler is
sometimes called a “smoke-tube” or “shell boiler” boiler