fire-tube boiler has the same disadvantages as that of the
horizontal-tube designlimited capacity and furnace
Before selecting a vertical fire-tube boiler, you must
know how much overhead space is in the building where
it will be used. Since this boiler sits in an upright
position, a room with a high ceiling is necessary for its
The blowdown pipe of the vertical tire-tube boiler is
attached to the lowest part of the water leg. and the
feedwater inlet opens through the top of the shell. The
boiler fusible plug is installed either (1) in the bottom
tube sheet or crown sheet or (2) on the outside row of
tubes, one third of the height of the tube from the bottom.
Horizontal Return Tubular Boiler
In addition to operating portable boilers, such as the
Scotch marine and vertical fire-tube boilers. the
Utilitiesman must also be able to operate stationary
boilers, both in the plant and in the field. A
STATIONARY BOILER can be defined as one having a
permanent foundation and not easily moved or relocated.
A popular type of stationary fire-tube boiler is the
HORIZONTAL RETURN TUBULAR (HRT) boiler
shown in figure 1-4.
Figure 1-3.Cutaway view of a vertical fire-tube boiler.
Figure 1-4.Horizontal return tubular (HRT) fire-tube boiler.