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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.

Read the first 6 Gas Distribution Systems flashcards as text

  1. What is the purpose of a gas distribution main valve installed at key intersections in the piping network?

    Answer: To isolate sections of the main for maintenance or emergency response

    Isolation valves at main intersections allow operators to shut off sections of the network to perform repairs or respond to leaks without interrupting service to the entire system.

  2. What class of plastic pipe is most commonly used for natural gas distribution in North America based on pressure rating?

    Answer: PE 4710

    PE 4710 is the most current high-performance polyethylene material specification widely used for natural gas distribution due to its superior pressure rating and slow crack growth resistance.

  3. What is 'leak survey frequency' determined by under 49 CFR Part 192 for gas distribution systems?

    Answer: Business classification (e.g., business district vs. residential) and pipe material

    Leak survey frequency under 49 CFR Part 192 depends on the business district classification and the pipe material, with more frequent surveys required for higher-risk areas.

  4. What is the function of a gas pressure regulator's 'vent line'?

    Answer: To release excess loading gas from the diaphragm chamber to atmosphere

    The vent line releases loading gas from the diaphragm chamber when the regulator opens, allowing the diaphragm to move and control downstream pressure.

  5. What record must a gas distribution operator maintain for each main and service line?

    Answer: As-built drawings or maps showing pipe location, size, material, and installation date

    Operators must maintain maps and records of the distribution system showing pipe location, diameter, material, and installation year as required by 49 CFR Part 192.

  6. Which type of fitting allows a branch connection to be made on a polyethylene gas main without interrupting gas service?

    Answer: Service tee saddle (saddle fusion fitting)

    A saddle fusion fitting is fused onto the outside of the main, allowing a branch connection to be drilled and tapped without shutting down gas flow.

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