Gas Fitter Practice · Question
What is the correct procedure for purging air from a newly installed natural gas piping system before lighting an appliance?
Purging air safely and to the outdoors is critical to prevent a dangerous air-gas mixture from forming inside the building or igniting prematurely. This must be
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Question: What is the correct procedure for purging air from a newly installed natural gas piping system before lighting an appliance?
Answer options:
- Light the furthest appliance and let it run until the flame is stable.
- Open the main gas valve fully and wait until a smell of gas is present. ✅ Use an approved method to vent the air to the outdoors, ensuring no ignition source is present.
- Connect a vacuum pump to draw out all the air before turning on the gas.
Correct answer: Use an approved method to vent the air to the outdoors, ensuring no ignition source is present.
Explanation: Purging air safely and to the outdoors is critical to prevent a dangerous air-gas mixture from forming inside the building or igniting prematurely. This must be done with extreme caution.
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