what is the operating principle of the watertube and firetube boiler?
Water tube boilers are more common in small size commercial boilers and in marine boilers. They are a good choice for marine applications because they are less affected by the movement of the ship. With a water tube boiler the levels in the steam drum are difficult to control in a heavy sea.
A fire-tube boiler is a type of boiler in which hot gases from the fire pass through one or more tubes within the boiler. A water-tube boiler is a type of boiler in which water circulates in tubes heated externally by the fire.
