What defines a longitudinal joint in a boiler?

A longitudinal joint in a boiler is defined as a seam running the length of the shell. This type of joint is critical because it is involved in the structure and integrity of the boiler, helping to manage internal pressures and maintain the overall strength of the cylindrical shape. Longitudinal joints are essential for the seamless alignment of the boiler's construction, ensuring efficient operation and safety during its functional lifecycle.

The focus on a seam that runs the length of the shell emphasizes the importance of stability and support against the stresses that the boiler may experience during operation. Such joints are typically created by welding, allowing for a strong bond that can withstand the high operational demands of a boiler.