Page 88 - Introduction to Marine Engineering
P. 88
Boilers 75
Boiler types
The watertube boiler is employed for high-pressure, high-temperature,
high-capacity steam applications, e.g. providing steam for main
propulsion turbines or cargo pump turbines. Firetube boilers are used
for auxiliary purposes to provide smaller quantities of low-pressure
steam on diesel engine powered ships.
Watertube boilers
The construction of watertube boilers, which use small-diameter tubes
and have a small steam drum, enables the generation or production of
steam at high temperatures and pressures. The weight of the boiler is
much less than an equivalent firetube boiler and the steam raising
Downcomers
Figure 4.2 Foster Wheeler D-Type boiler
