Should you use pipe thread-sealing compounds on the seats of brass flare fittings?

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Maine Propane Tank Setter Test: Get prepared with flashcards and multiple choice questions. Test your knowledge with explanations and hints for each answer. Equip yourself for success on your exam!

Multiple Choice

Should you use pipe thread-sealing compounds on the seats of brass flare fittings?

Explanation:
The essential idea is that flare fittings seal with their flare seating surfaces, not with the threads. The nut tightens the flare to create a metal-to-metal seal, so applying pipe-thread sealant to the seating area would contaminate the surfaces and prevent proper sealing. For propane installations, no sealant belongs on the seats of brass flare fittings; assemble to spec and verify with a leak test.

The essential idea is that flare fittings seal with their flare seating surfaces, not with the threads. The nut tightens the flare to create a metal-to-metal seal, so applying pipe-thread sealant to the seating area would contaminate the surfaces and prevent proper sealing. For propane installations, no sealant belongs on the seats of brass flare fittings; assemble to spec and verify with a leak test.

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