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Special Hazard Suppression Flashcards

7 cards from real CFPS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Special Hazard Suppression flashcards as text

  1. AFFF (Aqueous Film Forming Foam) suppresses flammable liquid fires primarily by:

    Answer: Forming a vapor-suppressing aqueous film and smothering the fuel surface

    AFFF drains an aqueous film ahead of the foam blanket that seals the fuel surface, simultaneously smothering the fire and preventing vapor release.

  2. Which NFPA standard covers low-, medium-, and high-expansion foam fire extinguishing systems?

    Answer: NFPA 11

    NFPA 11 is the standard for low-, medium-, and high-expansion foam systems applied to flammable and combustible liquid hazards.

  3. Alcohol-resistant AFFF (AR-AFFF) is specifically required when protecting fires involving:

    Answer: Polar solvents such as ethanol, acetone, and isopropanol

    Polar solvents rapidly destroy the foam blanket of standard AFFF by absorbing water; AR-AFFF forms a polymeric membrane that resists solvent breakdown.

  4. High-expansion foam is best suited for which type of fire scenario?

    Answer: Enclosed spaces such as basements, mines, or aircraft hangars

    High-expansion foam with expansion ratios of 200:1 to 1000:1 rapidly fills enclosed volumes to exclude oxygen, making it ideal for confined space flooding.

  5. The expansion ratio range for medium-expansion foam is:

    Answer: 20:1 to 200:1

    NFPA 11 defines low-expansion foam as up to 20:1, medium-expansion as 20:1 to 200:1, and high-expansion as 200:1 to 1000:1.

  6. Protein foam concentrate is derived from:

    Answer: Hydrolyzed natural protein material such as animal hooves and horns

    Protein foam is produced by hydrolyzing natural proteins (typically from animal by-products), giving it good heat resistance and drain-down characteristics.

  7. When designing a foam-water deluge system for a flammable liquid storage area, the minimum application rate is determined by:

    Answer: NFPA 11 requirements based on fuel type, foam type, and application method

    NFPA 11 provides application rate tables that account for fuel type, foam concentrate type, and whether application is top-side, subsurface, or semi-subsurface.