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Special Hazard Suppression Systems Flashcards

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  1. Which NFPA standard specifically governs carbon dioxide (CO2) extinguishing systems?

    Answer: NFPA 12

    NFPA 12 is the Standard on Carbon Dioxide Extinguishing Systems, covering design, installation, testing, and maintenance of CO2 systems.

  2. Per NFPA 12, what is the minimum total flooding design concentration of CO2 required to extinguish Class A surface fires?

    Answer: 34%

    NFPA 12 specifies a minimum CO2 concentration of 34% by volume for total flooding protection of Class A surface fire hazards.

  3. Which foam concentrate is specifically formulated to suppress fires involving polar solvents such as alcohols and ketones?

    Answer: AR-AFFF (Alcohol-Resistant AFFF)

    AR-AFFF forms a polymeric membrane on polar solvent surfaces that prevents the solvent from breaking down the foam blanket, unlike standard AFFF.

  4. Per NFPA 2001, what is the maximum time allowed to achieve the minimum design concentration in a total flooding clean agent system protecting a normally occupied space?

    Answer: 10 seconds

    NFPA 2001 requires that the design concentration be achieved within 10 seconds in normally occupied enclosures to minimize personnel exposure before evacuation.

  5. What is the primary environmental advantage of Novec 1230 (FK-5-1-12) over HFC clean agents such as FM-200 (HFC-227ea)?

    Answer: Significantly lower global warming potential (GWP of 1 vs. 3,220)

    Novec 1230 has a GWP of just 1 and an atmospheric lifetime of about 5 days, compared to FM-200's GWP of 3,220 and ~34-year lifetime.

  6. Wet chemical fire suppression systems installed in commercial cooking hood applications must comply with which NFPA standard?

    Answer: NFPA 17A

    NFPA 17A is the Standard for Wet Chemical Extinguishing Systems and governs design, installation, and maintenance of wet chemical systems used in commercial cooking equipment.

  7. Per NFPA 11, what is the typical expansion ratio range for 'high-expansion' foam?

    Answer: 200:1 to 1000:1

    NFPA 11 classifies high-expansion foam as having an expansion ratio between 200:1 and 1000:1, making it suitable for flooding large enclosed spaces such as warehouses.