Using oxygen to purge copper tubing after brazing could cause an explosion.

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Study for the NOCTI Heating, Ventilation, and Air Conditioning (HVAC) Test. Practice with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for your exam!

Multiple Choice

Using oxygen to purge copper tubing after brazing could cause an explosion.

Explanation:
Oxygen is a strong oxidizer, and when copper tubing is hot from brazing, any residual oil, grease, flux, or solvents inside the tube can ignite in an oxygen-rich environment. Purging with pure oxygen creates the potential for rapid combustion or a flash/explosion if a fuel source is present or a spark occurs. Because of this risk, using oxygen to purge is dangerous, so the statement is true. In practice, inert purge gases like nitrogen are used to displace air without providing an oxidizer, which is why purging with oxygen is avoided.

Oxygen is a strong oxidizer, and when copper tubing is hot from brazing, any residual oil, grease, flux, or solvents inside the tube can ignite in an oxygen-rich environment. Purging with pure oxygen creates the potential for rapid combustion or a flash/explosion if a fuel source is present or a spark occurs. Because of this risk, using oxygen to purge is dangerous, so the statement is true. In practice, inert purge gases like nitrogen are used to displace air without providing an oxidizer, which is why purging with oxygen is avoided.

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