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Pipeline Operations and Maintenance 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 primary hazard associated with natural gas accumulation in an enclosed space?

    Answer: Asphyxiation due to oxygen displacement and explosion risk

    Natural gas displaces oxygen, creating asphyxiation hazards, and within flammable limits it can explode if ignited.

  2. What action should a pipeline operator take when excavation damage exposes a pipeline?

    Answer: Immediately stop work, evacuate, and notify the operator

    When a pipeline is struck or exposed during excavation, work must stop immediately, the area must be evacuated, and the pipeline operator must be notified.

  3. What is the Lower Explosive Limit (LEL) of natural gas (methane) in air?

    Answer: 5%

    The Lower Explosive Limit of methane is approximately 5%, meaning concentrations below this level will not ignite.

  4. What is the function of a check valve in a natural gas system?

    Answer: To allow flow in one direction only

    A check valve permits gas flow in only one direction and automatically prevents reverse flow.

  5. Which tool is used to locate underground pipelines before excavation in the US?

    Answer: 811 one-call system

    The national 811 one-call system requires excavators to notify utilities before digging so pipelines and other buried utilities can be marked.

  6. What type of corrosion occurs when two dissimilar metals are connected in a moist environment?

    Answer: Galvanic corrosion

    Galvanic corrosion occurs when two dissimilar metals are electrically connected in an electrolyte, causing the less noble metal to corrode preferentially.

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