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Special Hazard Suppression Systems Flashcards

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  1. Which NFPA standard governs dry chemical extinguishing systems?

    Answer: NFPA 17

    NFPA 17 is the Standard for Dry Chemical Extinguishing Systems and covers design, installation, testing, and maintenance requirements.

  2. A CO2 local application system is the preferred approach when protecting a hazard that:

    Answer: Cannot be economically enclosed and total flooding is impractical

    Local application directs CO2 directly at the fuel surface or equipment when building a total-flooding enclosure is impractical or uneconomical.

  3. What is the primary purpose of a pre-discharge alarm in a total flooding gaseous suppression system?

    Answer: To warn occupants to evacuate before the agent discharges

    Pre-discharge alarms provide an audible/visual warning so personnel can evacuate the hazard area before the agent is released, preventing exposure to potentially hazardous concentrations.

  4. Halon 1301 was phased out of new production primarily because of:

    Answer: Its ozone-depleting properties identified under the Montreal Protocol

    Halon 1301 contains bromine, a highly effective ozone-depleting substance; its production was banned in developed countries by 1994 under the Montreal Protocol.

  5. Which foam type is most effective at controlling three-dimensional and flowing liquid hydrocarbon fires?

    Answer: AFFF (Aqueous Film Forming Foam)

    AFFF creates a thin aqueous film that spreads across the fuel surface rapidly, making it uniquely effective against spill fires and three-dimensional flowing fuel fires.

  6. Per NFPA 750, what droplet size criterion defines a water mist system discharge?

    Answer: The Dv0.99 (99th percentile droplet diameter) must be less than or equal to 1000 microns

    NFPA 750 defines water mist as a water spray for which the Dv0.99 is less than 1000 microns at the minimum design operating pressure, distinguishing it from conventional sprinkler spray.

  7. Under NFPA 2001, FK-5-1-12 (Novec 1230) is classified as which agent type?

    Answer: Halocarbon clean agent

    FK-5-1-12 is a fluorinated ketone and is classified as a halocarbon clean agent under NFPA 2001, alongside HFCs such as HFC-227ea and HFC-125.