Sample interview questions: Can you explain the process of purging air from a gas system?
Sample answer:
Purging Air from a Gas System
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Identify all gas appliances and gas lines: Shut off all gas valves leading into the appliances.
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Open highest point valve: Slowly open the gas valve at the highest point in the system, allowing air to escape. Note that this valve will typically be located on the gas meter or a manifold near appliances.
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Bleed air from appliances: Open the bleed valves on each appliance one at a time. Use a wrench or hex key to open the valve slightly, allowing air to escape. Close the valve once all the air has been expelled, indicated by a consistent flow of gas.
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Repeat for multiple appliances: Continue bleeding air from all appliances in the system until no more air is released.
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Source: https://hireabo.com/job/12_0_12/Gasfitter