When joining 2 1/2-8 NPT fittings, which sealant option is appropriate?

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Prepare for the NFPA 54 National Fuel Gas Code Test. Enhance your knowledge with multiple-choice questions and flashcards, complete with hints and detailed explanations. Get exam-ready now!

Multiple Choice

When joining 2 1/2-8 NPT fittings, which sealant option is appropriate?

Explanation:
Sealing threaded gas connections requires a sealant that is approved for natural gas service. Teflon tape (PTFE tape) or a pipe joint compound that is rated for gas are both acceptable for 2 1/2-8 NPT fittings. These sealants fill the gaps between the male and female threads to prevent gas leaks and are used according to the manufacturer’s instructions. No sealant can lead to leaks, and using gasket with hot glue isn’t appropriate for NPT threaded joints. A non-PTFE-only requirement would unnecessarily reject valid PTFE tape use. So the best choice is to use Teflon tape or gas-rated pipe joint compound.

Sealing threaded gas connections requires a sealant that is approved for natural gas service. Teflon tape (PTFE tape) or a pipe joint compound that is rated for gas are both acceptable for 2 1/2-8 NPT fittings. These sealants fill the gaps between the male and female threads to prevent gas leaks and are used according to the manufacturer’s instructions. No sealant can lead to leaks, and using gasket with hot glue isn’t appropriate for NPT threaded joints. A non-PTFE-only requirement would unnecessarily reject valid PTFE tape use. So the best choice is to use Teflon tape or gas-rated pipe joint compound.

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