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TFD BC > Foam > Flashcards

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
Q

What is foam “solution”?

A

The foam concentrate mixed with water

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26
Q

What is the foam tetrahedron?

A

Foam concentrate
Water
Air
Mechanical agitation

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27
Q

Foam is generated by what 3 things?

A

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
Q

Where does mechanical agitation occur?

A

As the water and foam concentrate pass through the hose

29
Q

With finished foam, greater expansion = ____ ____

A

Slower drainage

30
Q

As the foam drains it will become ____. It may look the same but will allow the ____ of ____.
This foam is called ____ ____

A

Dry
Release of vapors
Skeletal foam

31
Q

What are the 3 foam application techniques?

A

Bounce off
Bank-in
Lofting/raindown

32
Q

When applying foam to a fire, what should you never do?

A

Plunge

da toilet

33
Q

TFD engines carry what kind and how much foam on engines?

A

10 gallons of AFFF (Class B)

20 gallons of Class A in tank

34
Q

Class B foam is proportioned at ___% or ___% with a ___ foot max hose lay

A

3% or 6%

250 foot

35
Q

Class A foam is proportioned between ___% to ___% with a ___ foot max hose lay

A

.1 to 1%

350 foot

36
Q

The proportioner should be set at __ gpm

A

95 gpm

37
Q

What stream should we use when applying foam according to TFD SOPs?

A

30 degree fog

38
Q

What is the rate of application for a hydrocarbon fuel spill?

A

.10 gpm foam solution per square foot

39
Q

What is the rate of application for an ignited hydrocarbon fuel spill?

A

.15 gpm foam solution per square foot

40
Q

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…

A

Reduced

You should have enough

41
Q

What is gasoline blending?

A

Blending a polar solvent with a hydrocarbon

This is a process performed at the refinery level

42
Q

What are the results of gasoline blending?

A

A slightly polar hydrocarbon with high vapor pressure and a low surface tension

43
Q

What are 2 products used in blending?

A

MTBE- Methyl Tertiary Butyl Ether

Methanol

44
Q

What kind of foam must you use for gasoline blending and where can you find a supply of it?

A

AFFF/ARC

Station 1

45
Q

What are 5 safety considerations with foam?

A 
Identifying the hazard
Preserving the blanket
Wind direction
Flowing fuel
Backup lines
46
Q

What are 3 ways we can preserve the foam blanket?

A

Do not apply water to the foam
Do not walk in the blanket
Do not drag hose in the foam blanket

47
Q

The powerpoint lists 8 reasons why eductors fail, try to list them all.

A 
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
Q

Departments throughout the nation are going to class __ foam

A

A

49
Q

What are 4 safety benefits for class A foam?

A

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
Q

What is one concern of class A foam?

A

Footing may be slippery

51
Q

What is wet water?

A

Good for decreasing the surface tension of water

52
Q

Does wet water foam?

A

NO

So there is no barrier
Still will work for deep seated fires

53
Q

What is the ratio for wet water?

A

1 bottle for a 500 gallon tank

54
Q

What is micro blaze out?

A

Non-toxic, biodegradeable penetrating agent containing non-pathogenic microbs that digest hydrocarbons

55
Q

Micro blaze out is UL listed for ____ ____

A

Fighting fire

56
Q

3 other things for Micro blaze out…

A

Still not being used to fight fire at this time
Saves us $ for spill clean up
Used for hydrocarbon spills

57
Q

What is the ratio for Micro blaze out?

A

2.5 gallons of water for 8 oz of micro blaze out

58
Q

What is high expansion foam?

A

Water combined with synthetic surfactant, detergent type foaming agent and anti-freeze

59
Q

What is the expansion rate for high expansion foam?

A

200:1 to 1000:1

60
Q

What is high expansion foam useful for?

A

Fighting class A fires in indoor structures and inaccessible places (done by totally flooding area)

61
Q

What does high expansion foam do?

A

Displaces oxygen

62
Q

What is one consideration when using high expansion foam?

A

Structure must be properly ventilated

63
Q

Where is the only place that we can find high expansion foam generators?

A

At the PSA

64
Q

WP-25 produces ___cfm when pumped at 200psi at the inlet

A

2500cfm

65
Q

High expansion foam generators foam concentrate is ____ proportioned at the required rate and has an optional ____ ____ to direct foam through openings

A

Automatically

Discharge tube

TFD BC (26 decks)

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