What type of joint is typically used for passing a pipe to a boiler?

A flange joint is commonly used for connecting pipes to a boiler due to its ability to create a strong, secure, and easily accessible connection. Flanged connections consist of two flanged surfaces that are bolted together with a gasket in between to ensure a tight seal, capable of handling high-pressure conditions typically found in boiler applications. This type of joint allows for easy disassembly for maintenance or replacement without the need for cutting the pipe.

In contrast, other types of joints present certain limitations: a socket joint may not provide the same level of accessibility, a compression joint is generally limited to lower-pressure applications, and a threaded joint can be susceptible to leaks if not properly sealed or if the threads become worn. Therefore, flanged joints are preferred in high-pressure boiler systems for their reliability and ease of maintenance.