What is required to achieve a gas-tight connection when assembling 2 1/2-8 NPT fittings?

What is required to achieve a gas-tight connection when assembling 2 1/2-8 NPT fittings?

• A. Apply Pipe Joint Compound Or Teflon Tape
• B. Do Not Seal
• C. Only Use Glue
• D. Use A Gasket

Answer: (A)

Gas-tight threading relies on a proper sealant on the NPT threads. The correct approach is to apply an approved thread sealant—either pipe joint compound or PTFE tape rated for gas service—on the male threads before assembly. As the joint is tightened, the sealant fills the microscopic gaps in the threads to prevent gas leaks. Using glue or a gasket isn’t appropriate for these threaded connections, and leaving threads unsealed would allow leaks.

Gas-tight threading relies on a proper sealant on the NPT threads. The correct approach is to apply an approved thread sealant—either pipe joint compound or PTFE tape rated for gas service—on the male threads before assembly. As the joint is tightened, the sealant fills the microscopic gaps in the threads to prevent gas leaks. Using glue or a gasket isn’t appropriate for these threaded connections, and leaving threads unsealed would allow leaks.