What type of joint prevents overheating in a boiler?

In the context of boilers, the design and structural integrity of the joints are crucial for preventing overheating and ensuring safe operation. The longitudinal joint is specifically designed to handle the stresses and pressures involved in a boiler system. These joints run along the length of the boiler and are typically used in the construction of boiler tubes and shells.

Longitudinal joints are often welded or riveted, which enhances their ability to withstand thermal expansion and contraction that occurs due to heating. This resistance to overheating is vital because excessive heat can lead to structural failures, leaks, or even explosions in a boiler environment. Thus, a well-designed longitudinal joint contributes to the overall efficiency and safety of boiler operation.

In contrast, other types of joints, such as lap joints or circumferential joints, may not provide the same level of thermal regulation or structural support needed in high-pressure environments like those found in boilers. Therefore, the longitudinal joint's design and positioning make it the most suitable choice for preventing overheating in this context.