A. GENERAL
Firetube boilers are available for low or high pressure steam,
or for hot water applications. Firetube boilers are typically
used for applications ranging from 15 to 800 horsepower. A
firetube boiler is a cylindrical vessel, with horizontal tubes
passing through and connected to the front and rear tube
sheets. The vessel contains the water and absorbs the energy
generated from the flame. The front door and rear door
provide the seal to contain the hot combustion gasses. Baffles
designed into the doors serve to redirect the combustion
gasses through the various firetube passages. The flame
originates in the furnace. As the combustion gasses travel
down the furnace and through the various firetube channels,
heat from the flame and combustion gasses is transferred to
the water. Transferred energy develops into the required