Practice Test GeeksG3 - Gas Technician Level 3 Certification Practice Test
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Leak Detection and Testing Procedures Flashcards

7 cards from real G3 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Leak Detection and Testing Procedures flashcards as text

  1. Which leak detection method is most commonly used for a quick field check of gas piping joints?

    Answer: Soap bubble solution applied to joints

    Soap bubble solution is the standard field method for locating gas leaks at joints and fittings, as bubbles form visibly where gas escapes.

  2. Before applying pressure for a leak test on a new gas piping installation, what must a technician ensure?

    Answer: All open ends are capped and appliance connections are isolated

    All open ends must be capped and appliance connections isolated to contain the test pressure and obtain accurate results.

  3. What is the minimum test pressure typically required for a pressure integrity test on a residential gas piping system according to most North American codes?

    Answer: 10 psi

    Most codes require a minimum of 10 psi (or 1.5 times the maximum allowable operating pressure, whichever is greater) for pressure integrity tests on residential systems.

  4. When performing a pressure drop test, a technician notices a pressure drop of 0.5 in. W.C. over 10 minutes. What does this indicate?

    Answer: A leak is present in the system

    Any measurable pressure drop during a pressure drop test indicates a leak is present in the system, as a tight system should hold pressure.

  5. Which gas has the lowest explosive limit (LEL) making leak detection especially critical?

    Answer: Propane

    Propane has a lower LEL (2.1%) compared to natural gas (5%), meaning smaller concentrations of propane in air can create an explosive mixture.

  6. What is the primary reason soap solutions containing chlorides should NOT be used for leak detection on stainless steel gas piping?

    Answer: Chlorides cause stress corrosion cracking in stainless steel

    Chlorides in soap solutions cause stress corrosion cracking in stainless steel, compromising the pipe's structural integrity over time.

  7. After a gas leak is detected and repaired, what must a technician do before restoring gas service?

    Answer: Re-test the repaired section to confirm the leak is eliminated

    Re-testing the repaired section confirms the repair was successful and the leak has been eliminated before restoring service.