Which gas should never be used to test gas piping?

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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

Which gas should never be used to test gas piping?

Explanation:
Oxygen must never be used to test gas piping because it is a strong oxidizer and can make any leaked fuel gas ignite or even cause an explosion. The purpose of a test gas is to create a noncombustible or low-oxidizer environment so leaks can be found safely, so inert options like nitrogen (and sometimes argon or helium) are used instead. Using oxygen during a test would significantly raise the risk of ignition if there’s a leak, making it unsafe.

Oxygen must never be used to test gas piping because it is a strong oxidizer and can make any leaked fuel gas ignite or even cause an explosion. The purpose of a test gas is to create a noncombustible or low-oxidizer environment so leaks can be found safely, so inert options like nitrogen (and sometimes argon or helium) are used instead. Using oxygen during a test would significantly raise the risk of ignition if there’s a leak, making it unsafe.

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