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Foam Flashcards

1
Q

Class A and B foam that we use at TFD are High or Low expansion foams?

A

Low

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2
Q

What are class A foams used for?

A

Ordinary combustibles

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3
Q

What are class B foams used for?

A

Flammable liquids

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4
Q

What are the 5 class B foam types listed in the powerpoint?

A 
Protein foam
Fuoroprotein foam
Film Forming Fluoroprotein foam (FFFP)
Aqueous Film Forming Foam (AFFF)
Micro-Blaze Out
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5
Q

Hydrocarbon fuels ____ on water and are ____. (Wont mix with water)

A

Float

Hydrophobic

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6
Q

What does hydrophobic mean?

A

Wont mix with water

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7
Q

What are 7 examples of hydrocarbon fuels?

A 
Gasoline               
Kerosine               
Fuel oil                  
Benzene
Jet fuel
Crude oil
Naptha
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8
Q

Hydrocarbon fuel fires typically give off what color of smoke?

A

Black

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9
Q

Polar solvents are hydrophillic which means that…

A

They mix with water

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10
Q

What are 7 examples of polar solvents?

A

Alcohols Esters
Acetone Acids
Lacquer thinner Isopropyl
Ketones

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11
Q

Which burns cleaner, hydrocarbon fuels or polar solvents?

A

Polar solvents

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12
Q

Sometimes while polar solvents are on fire, the ___ is not visible

A

Flame

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13
Q

What are the 4 ways that foams work?

A

Smothering
Separating
Cooling
Suppressing

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14
Q

What is smothering?

A

Preventing air and flammable vapors from combining

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15
Q

What is separating?

A

Intervening between the fuel and the fire

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16
Q

What is cooling?

A

Water in the foam lowers the temperature of the fuel and adjacent surfaces

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17
Q

What is suppressing?

A

Preventing the release of flammable vapors

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18
Q

Many agents can extinguish a class B fire, however, foam provides what 4 things?

A

Firefighter safety
Prevention of fuel ignition/reignition
Suppression of flammable vapors
Post fire security

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19
Q

What is surface tension?

A

The ability of water to bind together

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20
Q

Does foam increase or decrease the surface tension of water?

A

Decrease

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21
Q

Decreasing the surface tension of water allows the foam to do what?

A

Float on top

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22
Q

What are the 3 types of incidents that may require foam?

A

Transportation accidents
Chemical spills
Spills of paint, motor oil, lacquer thinner (Flam. Liq. stored in warehouses and department stores)

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23
Q

What 3 things is foam NOT effective on?

A

Class C (electrical fires)
Pressurized gas
Combustible metals

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24
Q

What is the friction loss on a foam proportioner?

A

55 psi

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25
What is foam "solution"?
The foam concentrate mixed with water
26
What is the foam tetrahedron?
Foam concentrate Water Air Mechanical agitation
27
Foam is generated by what 3 things?
Mixing foam concentrate with water to make foam solution Mechanical agitation Aeration of the foam solution as it leaves the nozzle or is introduced before leaving the nozzle
28
Where does mechanical agitation occur?
As the water and foam concentrate pass through the hose
29
With finished foam, greater expansion = ____ ____
Slower drainage
30
As the foam drains it will become ____. It may look the same but will allow the ____ of ____. This foam is called ____ ____
Dry Release of vapors Skeletal foam
31
What are the 3 foam application techniques?
Bounce off Bank-in Lofting/raindown
32
When applying foam to a fire, what should you never do?
Plunge | da toilet
33
TFD engines carry what kind and how much foam on engines?
10 gallons of AFFF (Class B) | 20 gallons of Class A in tank
34
Class B foam is proportioned at ___% or ___% with a ___ foot max hose lay
3% or 6% | 250 foot
35
Class A foam is proportioned between ___% to ___% with a ___ foot max hose lay
.1 to 1% | 350 foot
36
The proportioner should be set at __ gpm
95 gpm
37
What stream should we use when applying foam according to TFD SOPs?
30 degree fog
38
What is the rate of application for a hydrocarbon fuel spill?
.10 gpm foam solution per square foot
39
What is the rate of application for an ignited hydrocarbon fuel spill?
.15 gpm foam solution per square foot
40
With un-ignited fuels, you may use a ____ percentage of solution per square foot to suppress vapors. But you should make sure that in case of ignition...
Reduced | You should have enough
41
What is gasoline blending?
Blending a polar solvent with a hydrocarbon | This is a process performed at the refinery level
42
What are the results of gasoline blending?
A slightly polar hydrocarbon with high vapor pressure and a low surface tension
43
What are 2 products used in blending?
MTBE- Methyl Tertiary Butyl Ether | Methanol
44
What kind of foam must you use for gasoline blending and where can you find a supply of it?
AFFF/ARC | Station 1
45
What are 5 safety considerations with foam?
``` Identifying the hazard Preserving the blanket Wind direction Flowing fuel Backup lines ```
46
What are 3 ways we can preserve the foam blanket?
Do not apply water to the foam Do not walk in the blanket Do not drag hose in the foam blanket
47
The powerpoint lists 8 reasons why eductors fail, try to list them all.
``` Mis-matched eductor and nozzle Air leaks in pick up tube or hose connection Improper flushing after use Kinked discharge hose line Nozzle elevation Too much hose between eductor and nozzle Incorrect inlet pressure to eductor Partially closed nozzle ```
48
Departments throughout the nation are going to class __ foam
A
49
What are 4 safety benefits for class A foam?
Quicker knockdown (more tenable atmosphere) Easier overhaul because of the absorption of water into the material Use less water (less water damage) Can be used for pre-treatment in wildland fires
50
What is one concern of class A foam?
Footing may be slippery
51
What is wet water?
Good for decreasing the surface tension of water
52
Does wet water foam?
NO So there is no barrier Still will work for deep seated fires
53
What is the ratio for wet water?
1 bottle for a 500 gallon tank
54
What is micro blaze out?
Non-toxic, biodegradeable penetrating agent containing non-pathogenic microbs that digest hydrocarbons
55
Micro blaze out is UL listed for ____ ____
Fighting fire
56
3 other things for Micro blaze out...
Still not being used to fight fire at this time Saves us $ for spill clean up Used for hydrocarbon spills
57
What is the ratio for Micro blaze out?
2.5 gallons of water for 8 oz of micro blaze out
58
What is high expansion foam?
Water combined with synthetic surfactant, detergent type foaming agent and anti-freeze
59
What is the expansion rate for high expansion foam?
200:1 to 1000:1
60
What is high expansion foam useful for?
Fighting class A fires in indoor structures and inaccessible places (done by totally flooding area)
61
What does high expansion foam do?
Displaces oxygen
62
What is one consideration when using high expansion foam?
Structure must be properly ventilated
63
Where is the only place that we can find high expansion foam generators?
At the PSA
64
WP-25 produces ___cfm when pumped at 200psi at the inlet
2500cfm
65
High expansion foam generators foam concentrate is ____ proportioned at the required rate and has an optional ____ ____ to direct foam through openings
Automatically | Discharge tube

TFD BC (26 decks)

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