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Emergency Response Procedures 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 Emergency Response Procedures flashcards as text

  1. What concentration of natural gas in air (expressed as % LEL) typically triggers evacuation procedures?

    Answer: 25% LEL

    Most standard operating procedures require evacuation and emergency response actions when gas concentrations reach or exceed 25% LEL to provide a safety margin below the explosive range.

  2. What agency must a natural gas operator notify if a gas incident causes a death or injury requiring hospitalization?

    Answer: PHMSA National Response Center

    49 CFR Part 191 requires operators to notify the PHMSA National Response Center by telephone for incidents involving death, injury requiring hospitalization, or significant property damage.

  3. What is 'backfilling and compaction' important for after a gas main repair?

    Answer: Restoring original soil conditions to protect the pipe and prevent future settlement

    Proper backfilling and compaction restore soil support around the repaired pipe, prevent ground settlement, and protect the pipe from future damage.

  4. Who is typically responsible for shutting off gas service during a structure fire when the fire department requests it?

    Answer: The gas utility upon request from fire department or emergency responders

    The gas utility is responsible for safely shutting off service when requested by fire or emergency personnel during a structure fire.

  5. What is the purpose of 'purging with inert gas' before restarting a gas main?

    Answer: To displace oxygen from the piping before introducing flammable gas, preventing a combustible mixture

    Purging with nitrogen or another inert gas displaces air (oxygen) from the piping so that when natural gas is introduced, no flammable mixture can form.

  6. What information must a gas operator collect when responding to a public report of a gas odor?

    Answer: Location, time, description of odor, and whether anyone is inside the affected structure

    First responders must collect the exact location, time of report, odor description, and occupancy status to prioritize and direct an effective emergency response.

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