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41 Cards in this Set
- Front
- Back
4 Ways foam extinguishes fire?
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Seperating
Cooling Smothering Penetrating |
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Class A foams are intended to be used on what?
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Flammable solids
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Class B foams are intended to be used on what?
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Flammable liquids
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Two types of flammable liquids that class B foam is used on?
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Hydrocarbons (does NOT mix with water)
Polar solvents (mixes with water) |
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Hydrocarbon Fuel examples?
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Crude oil, fuel oil, gasoline, benzene, naphtha, jet fuel, kerosene, are petroleum based combustible or flammable liquids that float on water.
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Polar Solvents examples?
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Alcohols, acetone, lacquer thinner, ketones, esters, and acids, are flammable liquids that mix readily with water.
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Foam Concentration
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Raw Foam liquid before the introduction of water and air.
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Foam Proportioner
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Device that introduces foam concentrate into the water stream to make foam solution.
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Foam Solution
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Mixture of foam concentrate and water before the introduction of air
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Foam (finished foam)
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Completed product after air is introduced into the foam solution.
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4 Stages of Foam creation?
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Foam Concentration
Foam Proportioner Foam Solution Foam |
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Foams today are of the MECHANICAL type and must be _____ and ______ before use?
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proportioned and aerated
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Depending on its purpose, foam can be described by three types:
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Low-expansion
Medium-expansion High-expansion |
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What NFPA standard is used for foam expansion?
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NFPA 11
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What is the Air/Solution ratio for low-expansion foam?
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20:1
*20 parts finished foam for every part of foam solution. |
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What is the Air/Solution ration for medium-expansion foam?
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20:1 to 200:1
*through hydraulically operated nozzle types. |
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What is the Air/Solution ration for high-expansion foam?
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200:1 to 1,000:1
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Which class of foam is being used more increasingly on wildland and structural fires?
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Class A
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Which Class of foam can be used with Fog Nozzles, Aspirating Foam Nozzles, medium and high expansion devices and compressed air foam systems (CAFS)?
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Class A
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Which foam is mildly corrosive, needing equipment to be flushed thouroly afterwards?
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Class A
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Which Class of foam is manufactured from either a synthetic or protein based substance?
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Class B
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How thick should a blanket of foam be to be most effective?
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4 Inches
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Most fire fighting concentrates are intended to be mixed at which percentage of water?
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94 to 99.9 percent
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Which Class of Foam is an exception to changing the percentage of water to control fire?
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Class A
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Class B Foams are mixed in proportions from what percentage range?
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1% to 6%
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What percentages are used on Class B foams that can be used on both Hydrocarbons and Polar Solvents?
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3% for Hydrocarbons
6% for Polar Solvents |
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4 Methods by which foam may be proportioned?
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Induction
Injection Batch-mixing Premixing |
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Two types of Foam proportioners for Induction?
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In-line eductors
Foam nozzle eductors |
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Type of Foam system commonly employed in apparatus-mounted or fixed fire protection system applications?
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Injection
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Simplest and most accurate method of mixing foam concentrate?
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Batch Mixing
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Type of foam creation that isnt effective on large inncidents?
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Batch Mixing
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One of the more commonly used methods of proportioning?
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Premixing
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Premix method is used with what 4 applications?
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Portable extinguishers
Wheeled extinguishers Skid-mounted twin agents units vehicle-mounted tank systems |
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Premix systems can be used how many times?
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one time
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What is the most common foam proportioners in used today?
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In-line Foam Eductors
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What are two types of portable proportioners?
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In-line foam eductors
Foam Nozzle Eductors |
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Which type of nozzle is used with compressed air foam systems (CAFS)?
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Solid-bore nozzles
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Fog Nozzles are used best with what type of foam and which class?
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AFFF Foam
& Class A |
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Air-aspirating foam must be used with which type of foam?
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Protien and fluoroprotein concentrates
*Probide maximum expansion of the agent. |
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Two types of medium and high expansion foam nozzles?
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Water-aspirating Nozzle
Mechanical Blower |
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Three ways to apply foam to a liquid fire or spill?
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Roll on method
Bank-down Method Rain Down method |