What does the term "boiler shell" refer to?

The term "boiler shell" refers to the primary structure that contains water and steam. In a boiler, the shell is critical as it forms the main body where the heating and transformation of water into steam occur. The shell is designed to withstand high pressures and temperatures, ensuring that it safely contains the water and steam under operational conditions.

This definition is essential for understanding how boilers work because the efficiency and safety of a boiler depend significantly on the integrity and design of the shell. The shell houses the water that is heated and ultimately converted into steam, which can then be used for various applications, including powering turbines or providing heating. Thus, the proper function and quality of the boiler shell are crucial for the overall performance of the boiler system.