When part of firetube boilers, heads are commonly called?

In firetube boilers, the ends of the tubes where they are attached are commonly referred to as tube sheets. Tube sheets serve a critical function, acting as barriers to separate the combustion gases from the water in the firetubes. These components are crucial for ensuring that the heat exchange occurs effectively while maintaining the integrity of the boiler's design.

Tube sheets are also designed to withstand high pressures and temperatures typical of boiler operation, making them vital for the safety and efficiency of the boiler. They help in supporting the tubes and maintain the overall structure of the firetube design, allowing for optimal performance during operation. This terminology reflects the specific engineering function that tube sheets perform, distinguishing them from other components like heads or end plates, which may have different roles or definitions in other contexts or types of boilers.