Which type of joint is commonly used for metal gas piping?

The correct answer relates to the types of joints that are typically used in metal gas piping systems, specifically welded and threaded joints. These joints are preferred because they provide a reliable and secure method for connecting metal piping used in gas systems.

Welded joints create a continuous bond between the pipes, ensuring there are no weak points that could lead to leaks, which is critical in gas applications. The welding process involves melting the edges of the pipes and fusing them together, resulting in a strong and often permanent connection that provides excellent integrity against pressures typically found in gas piping systems.

Threaded joints also offer effective means for connecting sections of piping. They allow for easy assembly and disassembly, which can be very helpful during maintenance and repairs. The threaded nature of the joint utilizes male and female threads to form a tight seal, which is essential for preventing leaks in gas distribution.

Other types of joints mentioned do not align with the typical standards for gas piping. Slip joints, for example, are usually associated with systems requiring flexibility and are more common in drain and waste piping. Soldered joints are primarily used for non-gas applications such as water piping and are not suitable for high-pressure gas systems. Compression joints rely on a mechanical grip which, while sufficient for