Ch 2 Flashcards
How does foam prevent/extinguish fire
Separate
Cools
Suppresses
How many categories of mechanical concentrators are there
2
What class is ordinary combustibles
A
What class is flammible/combustibles
B
What is needed to produce a foam blanket
Foam
Water
Air
Mechanical aeration
What solvents can be used on hydrocarbon fires
Polar
What is a key characteristic when choosing a foam
Expansion
What refers to an increase volume of solution
Expansion
What are the 3 types of foam expansion
Low
Med
High
What is the low ratio
Up to 20 parts
What is medium ratio
20-200 parts
What is high ratio
200-1000 parts
What is the normal storage temp range
35-120
Who established corrosion rates for class A
NFPA
What is the NFPA for Class A foam
1150
Using foam and dry chemicals as a mix is commonly referred to as
Multiagents
Where are cart mounted units commonly found
Industrial facilities
What is the primary concern of finished foam
Impact
What areas should be avoided for discharge
Rivers
Lakes
Streams
What does decomposition of foam result in
Consumption of oxygen
What is a measure of determining stability of foam
Rate of drain
What foam is thick and viscous
AR-AFFF
What is Clas A foam a formulation of
Hydrocarbon surfactants
What is best for developing long lasting class A foam
Small bubbles of consistent size
Class A foam does not adhere to surfaces above what temp
212
What percent do most foam nozzles produce stabil foam
1
What percent is class A mixed in portions of
0.1-1%
What percent are fire attack nozzles at
0.2-0.5
What percent for exposure protection
0.5-1%
What percent for air aspirating nozzles
0.3-1%
What percent for compressed air systems
0.2-0.5%
What is the most common agent used at a structure fire
Water
What foam is most beneficial for rapid fire extinguishment when water supply is low
Class A
What are the 2 types of class B foam
Synthetic
Protein
What type of protein is class B foam made from
Animal
What is synthetic class B foam made from
Mixture of flurosurfactants
What foam is the exception when being stored together
Milspec
How long does it take protein based foam to degrade
2-8 days
How long does it take synthetic foam to degrade
20-40 days
Above what temp does class B foam break down
150
What are examples of polar solvents
Alcohol
Ketones
Esters
What is the primary reason class A foams are not recommended on class B fires
No fuel resistance
What is class B foam proportioned at
1-6%
What percent is used on hydrocarbons
3%
What percent is used on polar solvents
6
What percent is high expansion foam typically used at
1-2.5%
What should the discharge rate of foam be equal to
10% of area of spill
What type of foam is well suited for sub surface injection
Fluroprotein
How long does fluroprotein foam maintain its alcohol resistance
About 15
What type of foam is completely synthetic
AFFF
What is the storage temp range of AFFF *****
25-120°
What is the temp AFFF is affected by
Above 140
What percent is AR-AFFF used at for depths less than 1 inch
1%
What percent is AR-AFFF used at for polar solvents more than 1 inch
3%
What concentrate is NOT designed for premixing
AR-AFFF
Where is high expansion foam nit recommended for use
Outside
What concentrate is meant for use on class A or B fires
Emulsifiers
What method uses a foam eductor
Induction
What method uses a pump or bladder
Injection
What depth emulsifiers be used
Less than 1in thick
What system is uses on apparatuses
Injection
What is the simplest form of mixing foam
Batch mix
What form is used to mix within apparatus
Batch mix
How many times can a premix be used
1
What tanks are foam friendly
Polly
Fiberglass
Stainless steel
What is the NFPA for apparatus
1901
How much does foam weigh per gallon
9lbs
How many gallons are in bulk containers
250-450
What is the tank capacity on tenders
1500-8000
What is the tank capacity on pumpers
20-200
What is the tank capacity on ARFF
Up to 600
What is the tank capacity on fixed mount tanks
In excess of 3000
What is typically a viscous foam
AR-FFFP
What is viscosity affected by
Temp
Polar solvent foam will work on what other type fires
Hydrocarbon
Fluroprotein foam will not extinguish what type of fire
Polar solvent
What foams are used for multiagent attacks
AFFF
FFFP
What foams have a lethal affect on fish
Class A
What class of foam continues to wet as it drains
A
What is high expansion foam used for
Flooding confined spaces
What is the amount of liquid that drains from the bubble mass affected by
Expansion Ratio
What drainage rate does wet, class A foam have
Fast
What drainage rate does dry class A foam have
Slow
What 2 adjustments are strongly needed for medium finished foam
Air
Concentrate
What type of materials absorb water
Fibrous
What nozzle is used to apply AFFF and FFFP concentrates
Fog nozzle
What fuels is Mil-spec foams only uses on
Simple Hydrocarbon
What type of foam does not reduce oxygen levels
Synthetic
How do AR foams protect the finished foam
Creates a Membrane between the fuel and finished foam
What foams are referred to as smart foams
AR
Gasoline blended with above what percent of oxygen or ethanol require AR foam
10%
What is the proper percent for Class B foam regardless of which type of fuel they are used on
3%
What foams are virtually nonexistent
Protein
What foam is non compatable with dry extinguishing agents
Protein
What foam is only used on hydrocarbon fires
Protein
What foam flows across fuel surfaces rapidly
Fluroprotein
What percent is FFFP foam used on hydrocarbon fuels
3%
What percent is FFFP used on polar solvent fuels
6%
What is created when AR-AFFF is applied to polar solvent fuels
A membrane
What is vapor-mitigating foam designed for sole use on
Unignited spills of hazmat
When is a slow draining foam blanket desired
Long term vapor suppression
What foam is commonly batch mixed
Class A
How does alcohol resistance foam protect the finished foam
Providing a membrane
What is new multipurpose foam eductucted at
3%
What is the application rate for a spill that is 1000 sqft
200gpm
What light hydrocarbons can AR-AFFF be injected into
Gasoline
Kerosene
Jet fuel
What is added to class A foam that improves absorption
Nonfoaming
Ionic
Nonionic surfactants
Where is regular protein found
Fixed fire suppression systems
What are the types of protein used in foam
Hooves
Horn
Feathers meal
What is the drop test for a barrel
5ft
What is the drop test for a pail
4ft
What concentrates have temp storage range of 35-120
UL listed
What is a Halon substitute
Foam
What foams tend to be fast drainers that spread rapidly across liquid fuel surfaces
AFFF
FFFP
What surfaces over 212 does class A foam not adhere to
Vertical
What conditions strongly influence the course of a wildland fire
Density
Composition
Climate
Moisture
What devices is 1% AR foam applied with
Type 3
What is fluoroprotein foam a combination of
Protein
Synthetic
What is the most commonly used foam
AFFF
What concentrate has more film forming foam
Mil-spec
