What is required for gas piping above 70 psig?

What is required for gas piping above 70 psig?

• A. Welded
• B. Threaded
• C. Flanged
• D. Soldered

Answer: (A)

Gas piping that carries higher pressures needs joints that maintain tightness and strength under demanding conditions. Welding creates a continuous metal joint with no threaded or gasketed interfaces, which minimizes the risk of leaks, loosening, or failure when the pressure is high. Soldered joints don’t have the strength or reliability for gas service at higher pressures, and threaded joints can loosen or leak over time, while flanged joints add gasket leak paths and handling needs. For gas piping above 70 psig, the code requires welded joints to ensure a secure, leak-tight connection, which is why welding is the correct choice.

Gas piping that carries higher pressures needs joints that maintain tightness and strength under demanding conditions. Welding creates a continuous metal joint with no threaded or gasketed interfaces, which minimizes the risk of leaks, loosening, or failure when the pressure is high. Soldered joints don’t have the strength or reliability for gas service at higher pressures, and threaded joints can loosen or leak over time, while flanged joints add gasket leak paths and handling needs. For gas piping above 70 psig, the code requires welded joints to ensure a secure, leak-tight connection, which is why welding is the correct choice.