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Medical Gas Systems Flashcards

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  1. What is the maximum allowable pressure drop across a zone valve in a medical gas piping system under full flow conditions per NFPA 99?

    Answer: 5 psi

    NFPA 99 requires that zone valve pressure drop not exceed 5 psi under full-flow conditions to maintain adequate downstream pressure.

  2. Which color-coded label is assigned to nitrous oxide piping in a US hospital per NFPA 99 and CGA standards?

    Answer: Light blue

    Nitrous oxide piping is identified with a light blue label per CGA C-9 and NFPA 99 to distinguish it from oxygen (green) and medical air (yellow).

  3. A biomedical technician is verifying a medical air compressor system. Which parameter must be continuously monitored and alarmed per NFPA 99?

    Answer: Dew point of the air supply

    NFPA 99 requires continuous monitoring and alarming of the dew point of medical air to ensure adequate moisture removal and prevent contamination.

  4. In a bulk liquid oxygen system, what safety device prevents overpressure in the storage vessel?

    Answer: Pressure relief valve

    Pressure relief valves are required on bulk liquid oxygen storage vessels to vent excess pressure and prevent catastrophic failure.

  5. When performing a cross-connection test on a newly installed medical gas system, which method is used to verify outlet identity?

    Answer: Pressurize one gas at a time and verify only labeled outlets flow that gas

    Cross-connection testing pressurizes one gas source at a time while verifying that only the correctly labeled outlets supply that gas and no cross-flow occurs.

  6. Which NFPA 99 health care facility category requires the highest level of medical gas system redundancy and emergency backup?

    Answer: Category 1

    Category 1 facilities (e.g., operating rooms, ICUs) require the highest redundancy because failure of equipment could cause major injury or death.

  7. What is the primary hazard of using a cylinder of compressed oxygen in an area with oil-contaminated fittings?

    Answer: Risk of fire or explosion due to oxygen-enriched ignition of oil

    Oil in contact with high-pressure oxygen can ignite spontaneously, creating a severe fire or explosion hazard; all oxygen equipment must be oil-free.