Flashcards in Chapter 14 - Foam Equipment and Systems Deck (128)
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1
____________ foams are the most common foams in use. These products must be ___________ (mixed with water) and _______ (mixed with air) before use.
Mechanical / proportioned / aerated
p 480
2
- Foam produced by a physical agitation of a mixture of foam concentrates, water, and air.
Mechanical Foam
p 480
3
- Mixing of water with an appropriate amount of foam concentrate in order to form a foam solution.
Proportioning
p 480
4
- Introduction of air into a foam solution to create bubbles that result in finished foam.
Aeration
p 480
5
To produce fire fighting foam, foam concentrate, water, and air must be _________ or injected in the correct ratios.
educted
p 480
6
- Process used to mix foam concentrate with water in a nozzle or proportioner; concentrate is drawn into the water stream by the Venturi method.
Eduction
p 480
7
- Raw foam liquid in its storage container before being combined with water and air.
Foam concentrate
p 480
8
- Device that injects the correct amount of foam concentrate into the water stream to make foam solution.
Foam proportioner
p 480
9
- Mixture of foam concentrate and water before the introduction of air.
Foam solution
p 480
10
- Completed product after air is introduced into the foam solution.
Foam
Also known as finished foam
p 480
11
Class B fuels are divided into two categories; _______________ and ________ __________.
hydrocarbons and polar solvents
p 480
12
Fuels such as crude oil, fuel oil, gasoline, benzene, and kerosene are what type of class B fuels?
Hydrocarbons
p 480
13
Hydrocarbon fuels such as crude oil, fuel oil, gasoline, benzene, and kerosene, are _____________ based and have a specific gravity ?
petroleum based
less than one (water being considered equal to one) and will float on water
p 480
14
Class B foam is effective in extinguishing hydrocarbon fuel fires and suppressing vapors because it ?
floats on the surface of hydrocarbon fuels
p 480
15
Fuels such as alcohol, acetone, ketones, and esters are what type of class B fuels ?
Polar solvents
p 480
16
Polar solvent fuels, such as alcohol, acetone, ketones, and esters, are know as _________ liquids because they mix with water.
miscible
p 480
17
Many modern fuels, including gasoline, are blended with up to 15 percent ________ additives. Treat these products as ________ _________ during emergency operations.
solvent / polar solvents
p 480
18
What foams are designed solely for use on hydrocarbon fuels and are not effective on polar solvent products regardless of the concentration that is applied ?
Class B foams
p 481
19
- A petroleum based organic compound that contains only hydrogen and carbon.
Hydrocarbon Fuel
p 481
20
- Liquid having a molecule where the positive and negative charges are permanently separated, resulting in their ability to ionize in solution and create electrical conductivity. Water, alcohol and sulfuric acid are examples.
Polar Solvents
p 481
21
- Materials that are capable of being mixed in all proportions.
Miscible
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22
How foam works:
Foam extinguishes and/or suppresses vapors by the following methods
* ____________ - Creates a barrier between the fuel and the fire
* _________ - Lowers the temperature of the fuel and adjacent surfaces
* ____________ or ___________ - Prevents the release of flammable vapors, reducing the possibility of ignition or reignition.
* Separating
* Cooling
* Suppressing or smothering
p 481
23
______________ is the act of mixing water with foam concentrate to form a solution.
Proportioning
p 482
24
Most fire fighting foam concentrates are formulated to mix with ______ to _____ percent water.
94 to 99.9
p 482
25
Class A foams are formulated to be proportioned within certain limits established by the manufacturer to achieve specific objectives. These percentages may range from as little as ____ percent to ___ percent.
0.1 to 1 percent
p 482
26
Foam is proportioned using one of four basic methods:
* __________
* _________
* _______ ________
* ___________
* Induction
* Injection
* Batch Mixing
* Premixing
p 482-483
27
The ___________ method of proportioning foam uses the pressure of a water stream to induct (draft) foam concentrate into the fire stream.
induction method
p 483
28
Induction
This is achieved by passing the stream of water through a Venturi device called an __________.
eductor
p 483
29
Induction
A _________ ______ connected to the eductor is inserted into the foam concentrate container.
pickup tube
p 483
30
