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Gas Distribution Systems Flashcards

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

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  1. What is the typical operating pressure range for a low-pressure natural gas distribution system serving residential customers?

    Answer: 0.25 to 2 psig

    Low-pressure residential distribution systems typically operate between 0.25 and 2 psig to safely supply gas to home appliances.

  2. What material is most commonly used for new natural gas distribution mains installed in the United States?

    Answer: Polyethylene (PE)

    Polyethylene pipe is the dominant material for new gas distribution mains due to its corrosion resistance, flexibility, and ease of installation.

  3. What is the purpose of a service line in a natural gas distribution system?

    Answer: To connect the distribution main to the customer's meter

    A service line is the piping that connects the distribution main to the customer's meter set assembly.

  4. What does the acronym 'PE' stand for when referring to gas distribution pipe material?

    Answer: Polyethylene

    PE stands for polyethylene, a thermoplastic material widely used for natural gas distribution piping.

  5. What is the purpose of installing a curb valve on a gas service line?

    Answer: To isolate the service line at the property line for emergency shutoff

    A curb valve allows the utility or emergency responders to quickly shut off gas supply at the property boundary without entering the building.

  6. What is the minimum burial depth for a polyethylene gas distribution main in a normal excavated trench?

    Answer: 18 inches

    49 CFR Part 192 requires a minimum cover of 18 inches for plastic gas mains in normal conditions to protect against damage.

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