For gas piping, what type of connections must be used if the piping is concealed?

In the context of concealed gas piping, brazed tubing fittings are the appropriate choice due to their ability to create a permanent and reliable joint that is resistant to leaks. Brazing involves joining two or more metals by melting and flowing a filler metal into the joint, which results in a strong bond that maintains integrity under varying temperatures and pressures typically found in gas systems.

Brazed joints also provide a smooth and effective flow path for gas, minimizing turbulence and potential accumulation of debris that could lead to blockages or leaks. Because if the piping is concealed, it is crucial to ensure there are no maintenance issues or access challenges, and brazing offers a level of security and permanence that suits these installations well.

Unions and fittings, while useful for making disconnections easily accessible, may not provide the same leak-proof joint when concealed. Compression couplings and socket weld joints also serve specific purposes in piping applications, but they may not provide the same degree of durability or permanent joint security as brazed fittings in conditions where visibility and access for maintenance are limited.