Which leak testing approach uses a tracer gas to reveal leaks?

Which leak testing approach uses a tracer gas to reveal leaks?

• A. Hydrostatic test
• B. Vacuum test
• C. Acoustic test
• D. Tracer-gas test

Answer: (D)

Tracer-gas testing works by introducing a gas into the item under test and then using a detector to sense where that gas is escaping. Because gases can pass through very small openings, this method is highly sensitive and can pinpoint leaks that other methods might miss. Common choices for tracer gases include helium, hydrogen, or sulfur hexafluoride, chosen for their detectability. A detector or sniffer is moved around joints, seams, and potential leak points to find where the tracer gas appears outside the system, revealing the leak path. In contrast, hydrostatic testing relies on liquid pressure to show leaks, vacuum testing checks for pressure loss, and acoustic testing listens for leak sounds; none use a tracer gas for detection.

Tracer-gas testing works by introducing a gas into the item under test and then using a detector to sense where that gas is escaping. Because gases can pass through very small openings, this method is highly sensitive and can pinpoint leaks that other methods might miss. Common choices for tracer gases include helium, hydrogen, or sulfur hexafluoride, chosen for their detectability. A detector or sniffer is moved around joints, seams, and potential leak points to find where the tracer gas appears outside the system, revealing the leak path. In contrast, hydrostatic testing relies on liquid pressure to show leaks, vacuum testing checks for pressure loss, and acoustic testing listens for leak sounds; none use a tracer gas for detection.