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Questions and Answers
What is the benefit of Class A foam?
What is the benefit of Class A foam?
- Reduces the surface tension of water (correct)
- Forms a vapor barrier on fuel spills
- Does not conduct electricity
- Incompatible with many other foam types
Which type of foam contains a surface-active agent that produces a fast-spreading film?
Which type of foam contains a surface-active agent that produces a fast-spreading film?
- High expansion
- Aqueous film-forming
- Class A
- Fluoroprotein (correct)
Class B foam is used for which type of fire?
Class B foam is used for which type of fire?
- Organic materials
- Electronic equipment
- Combustible metals
- Flammable liquids (correct)
How does foam extinguish flammable liquid fires?
How does foam extinguish flammable liquid fires?
Which type of nozzle is used most commonly with fluoroprotein foam?
Which type of nozzle is used most commonly with fluoroprotein foam?
Which type of foam is particularly well suited for gasoline spills?
Which type of foam is particularly well suited for gasoline spills?
Which type of nozzle is most commonly used to apply aqueous film-forming foam?
Which type of nozzle is most commonly used to apply aqueous film-forming foam?
To batch mix 3 percent foam into a 500 gallon water tank, how much foam concentrate should be added to the tank?
To batch mix 3 percent foam into a 500 gallon water tank, how much foam concentrate should be added to the tank?
Which device mixes foam concentrate in the water stream in the proper percentage?
Which device mixes foam concentrate in the water stream in the proper percentage?
Which type of foam is effective on polar solvents?
Which type of foam is effective on polar solvents?
What is the correct operating pressure for an in-line foam educator?
What is the correct operating pressure for an in-line foam educator?
Adding foam concentrate to a fire apparatus tank is called ____.
Adding foam concentrate to a fire apparatus tank is called ____.
Which type of foam is made from animal by-products?
Which type of foam is made from animal by-products?
What is high-expansion foam particularly used for?
What is high-expansion foam particularly used for?
The low surface tension of Class A foam affects its extinguishing properties by ________.
The low surface tension of Class A foam affects its extinguishing properties by ________.
Which foam application method is best for a pool of flammable liquid on open ground?
Which foam application method is best for a pool of flammable liquid on open ground?
Which foam application method is best for an open-top storage tank fire?
Which foam application method is best for an open-top storage tank fire?
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Study Notes
Class A Foam
- Reduces surface tension of water, enhancing water's ability to penetrate and suppress fires.
Fluoroprotein Foam
- Contains surface-active agents that create a fast-spreading film, effective on flammable liquid fires.
Class B Foam
- Specifically designed for flammable liquid fires, providing effective suppression in incidents involving such materials.
Foam Mechanism
- Extinguishes flammable liquid fires by separating the fuel from the flames, preventing re-ignition.
Nozzle Types
- Aerating Nozzle: Commonly used with fluoroprotein foam for effective dispersal.
- Adjustable Fog Nozzle: Most effective for applying aqueous film-forming foam.
Aqueous Film-Forming Foam
- Best suited for gasoline spills, providing rapid coverage and suppression.
Mixing Foam
- To achieve a 3% foam solution in a 500-gallon tank, 15 gallons of foam concentrate is required.
Foam Mixing Devices
- Proportioner mixes foam concentrate with water in the correct ratios, ensuring effective application.
Alcohol Resistant Foam
- Effective on polar solvents, critical in combating fires involving complex chemical compositions.
In-line Foam Educator Pressure
- Operates best at 200 psi, ensuring optimal mixing and delivery of foam.
Batch Mixing
- The process of adding foam concentrate to a fire apparatus, essential for maintaining foam supply during operations.
Protein Foam
- Made from animal by-products, highlighting the natural origins of some foam types.
High-Expansion Foam
- Particularly useful for flooding large enclosed areas, providing rapid suppression in extensive spaces.
Low Surface Tension Impact
- Allows deeper water penetration into fuels, enhancing extinguishing effectiveness of Class A foam.
Foam Application Methods
- Sweep (Roll-On): Best for flammable liquid pools on open ground, laying a blanket of foam to suppress fire.
- Bank Shot (Bank-Down): Most effective for fires in open-top storage tanks, allowing foam to flow onto the fuel surface.
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