Metallic pipe joints can be joined how according to safety regulations?

Metallic pipe joints can be joined through methods such as welding or brazing according to safety regulations. Welding creates a permanent joint by melting the base metals together, which results in a strong, pressure-tight connection. Brazing, on the other hand, involves using a filler metal with a melting point above 450°C (842°F) to bond the pieces without melting the base metals, providing a robust joint as well. These methods are considered safe and effective for high-pressure applications typical of propane gas systems.

In various contexts, the other joining methods may not meet the stringent safety standards required for propane gas installations. For instance, while screwed joints can be utilized in certain situations, they may not provide the same level of integrity as welded or brazed connections, especially under high-pressure conditions. Bolted joints might introduce points of potential leakage or failure due to the mechanical fastening rather than a metallurgical bond. Clamps can be used for temporary connections or low-pressure situations, but they are generally not deemed reliable for permanent joints in high-pressure systems like those found in propane installations.