A fire tube boiler has:

A fire tube boiler is characterized by having water on the outside of the tubes and flue gases on the inside. This design enables the hot gases produced from the combustion process to flow through the tubes, while the water surrounds these tubes in the boiler shell. The heat from the flue gases is transferred to the water, which then generates steam or hot water for various applications.

In this type of boiler, the efficiency of heat transfer is maximized because the hot gases are in direct contact with the tubes that contain the water. As the flue gases travel through the tubes, they release heat, raising the temperature of the water surrounding them. This process is critical for the efficient operation of the fire tube boiler and is a fundamental aspect of its design.

Understanding the structure and operation of fire tube boilers is essential for those working in industries that involve steam generation and heating systems.