Ch.14 Flashcards by Rolla Forcum

Most fire fighting foam concentrates are formulated to mix with __ of water ?

94 to 99.9%

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What are the 3 foam extinguishing /suppressor methods ?

Separating
Cooling
Suppressing or smothering

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Class B fuels are divided into two categories?

Hydrocarbons
Polar solvents

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High expansion foam generator that uses a fan to inject the air into the foam solution as it passes through the unit?

Mechanical blower

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Foam concentrate that combines the qualities of Fluroprotein foam with those of Aqueous film forming foam?

Film forming fluoroprotein foam
(FFFP )

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Generally , 2 cubic feet per minute of air flow per gallon per minute of foam solution produces a dry foam of up to _____ gpm of foam solution ?

100 gpm

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What are the 3 foam expansion levels ?

Low- up to 20:1
Medium 20:1 to 200:1
High 200:1 to 1000:1

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What are the 4 basic methods foam is proportioned ?

Induction
Injection
Batch mixing
Premixing

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________ such as alcohol , acetone , ketones and esters are known as __________ liquids because they mix with water ?

Polar solvents
Miscible

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Result of adding air to a foam solution consisting of water and foam concentrate ?

Foam expansion

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The result of mixing the appropriate amount of foam concentrate with water?

Foam solution

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Device that injects the correct amount of foam concentrate into the water stream to make the foam solution?

Foam proportioner

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Standard on foam chemicals for fires in class A fuels?

NFPA 1150

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Chemical change in which a substance breaks down into two or more simpler substances?

Decomposition

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Expansion rates for most fog nozzles are in the ___ up to ____ range ?

2:1 up to 4:1 range

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Method of proportioning foam that uses an external pump or head pressure to force foam concentrate into the fire stream at the correct ratio for flow?

Injection

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Foam produced by physical agitation of a mixture of foam concentrate, water and air?

Mechanical foam

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Class B foam should be stored in cool areas , shelf life for protein based foams is ____ yrs while synthetic foams is ___ to ___ years?

10yrs
20 to 25 yrs

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Pressure loss or gain created by changes in elevation between the nozzle and the pump?

Back pressure

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Mixing of water with an appropriate amount of foam concentrate in order to form a foam solution?

Proportioning

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Foam fire suppression agent designed for use on ignited or unignited class B flammable or combustible Liquids ?

Class B foam concentrate

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When bulk storage of foam concentrate is required , some fire dept or industrial facilities may specify ______ gallon containers called _______?

275 gallon
Totes

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Most foam nozzles will produce more stable foam at ____% concentration than a ___% concentration?

1%
0.5%

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_______ foams derived from animal protein sources such as hooves , horns or feathers?

Protein foams

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The concentration for hydrocarbon fuels is normally ___ or ___ % while ___ to ___ % is used for polar solvents?

1% or 3% 3% or 6%

Standard for foam expansion ratios?

Nfpa 11

Minimum amount of foam solution that must be applied to an unignited fire , spill or spill fire to either control vapor emissions or extinguish the fire ?

Application rate

Foam concentrate tanks on municipal fire apparatus generally range from__ to __ gallons , while foam pumpers /tenders may carry ___?

20 to 200 gallons 8000 gallons

Some master stream foam nozzles are capable of delivering ______ gpm?

14,000 gpm

Type of foam concentrate proportioner that operates in random with a fire water pump to ensure a proper foam concentrate to water mixture?

By pass type balanced pressure proportioner

Portable proportioning device that injects a liquid such as a foam concentrate into the water flowing through a hose line?

Eductor

Class A foams are formulated to be proportioned with in certain limits , these range from as little as ___ to ___?

0.1% to 1%

______________ are the most common foams in use ?

Mechanical foams

Raw foam liquid in its storage container before being combined with water and air?

Foam concentrate

Mixture of foam concentrate and water before introduction of air ?

Foam solution

Device that injects the correct amount of foam concentrate into the water stream to make the foam solution?

Foam proportioner

Crude oil , fuel oil , gasoline , benzene and kerosene are all __________ fuels?

Hydrocarbon fuels

Polar solvent fuels such as Alcohol , acetone , ketones and esters are know as ___________ liquids because they mix with water?

Miscible

Many modern fuels , including gasoline are blinded with up to __ % solvent additives and should be treated as polar solvents during emergency operations?

15%

Class B foams are designed solely for use on ____________ fuels and are not effective on ___________ products regardless of the concentration that is applied?

Hydrocarbon fuels Polar solvents

As the foam begins to break down , _________ is released , providing a cooling effect on the fuel suppressing the process of heat producing oxidation?

Water

_____________ is the act of mixing of water with foam concentrate to form a foam solution?

Proportioning

Foam concentrates are generally intended to be mixed with fresh water or ___________?

Saltwater

Solid or flexible tube used to transfer foam concentrate from a storage container to the inline eductor or proportioner?

Pick up tube

The __________ method of proportioning foam uses the pressure of a water stream to Induct (draft) foam concentrate into the fire stream ?

Induction

Portable proportioning device that injects a liquid , such as foam concentrate into the water flowing through a hose line or pipe?

Eductor

The __________ method of proportioning foam uses an external pump to force foam concentrate into the fire stream at the proper ratio in comparison to the flow?

Injection

This mixing method is commonly used with class A foams ?

Batch mixing

_____________ is a common method of proportioning in which Pre measured portions of water and foam concentrate are mixed in a container?

Premixing

5 gallon plastic ______ are commonly used containers in many municipal afire depts?

Pails

Foam concentrate is also available in 55 gallon plastic or plastic lined _________?

Barrels

When bull storage of foam concentrates is required, some Fire delta or industrial facilities may specify 275 gallon containers called?

Totes

Class ___ foam is applied to suppress fires involving flammable and combustible liquids?

Class B

Class B foam concentrates storage requirement for protein based foams is ____ yrs?

10 years

Synthetic class B foam storage shelf life is ___ to ___ years ?

20 to 25 yrs

Class B foams are mixed in proportions from __ to __ %?

1 to 6 %

The concentration for hydrocarbon fuels is normally __ to __ % while __ to __% is used for polar solvents?

1 to 3% 3 to 6%

Ability of a foam blanket to resist direct flame impingement such as would be evident in a partially extinguished petroleum fire?

Burn back resistance

Regular protein foam generally has a good heat stability and _____________?

Burn back resistance

Fluroprotein foam may be made alcohol resistant with the addition of ammonia salts suspended in organic solvents , the alcohol resistive properties will be effective for approximately ____ min , offering high water retention and resistance to heat?

15 mins

___________________ is currently the most commonly used synthetic foam concentrate?

Aqueous film forming foam (AFFF)

When AR-AFFF foam is applied to______________fuels a membrane is created over the fuel ?

Polar solvents

Type of foam Eductor that is used to supply self educting master stream nozzles , may be located at distances up to 3,000 feet from the nozzle?

Jet ratio controller (JRC)

A JRC proportions the concentrate at a ____% solution ?

66.5%

____________________ are one of the most common types of installed proportioners used in modern fire apparatus?

Around the pump proportioners

__________________ used on large mobile apparatus installations, such as ARFF vehicles , is one of the most accurate methods of foam proportioning?

Bypass type balanced pressure proportions

This method of foam application is effective for use only on a pool of liquid fuel on the open ground?

Roll on method

This is the most common method of application for above ground storage tank fires ?

Rain down method

Class A foam bubbles are filled with ____? Durable agents form small bubbles filled with ____?

Filled with air Filled with water