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49 Cards in this Set
- Front
- Back
when are they intended to be used?
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on small fires in incipient or early growth stage of fire
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5 classifications of fire
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class a -ordinary combustibles
class b- flammable or combustible liquids and gases class c- energized electrical class d- combustible metals class k- kitchen=combustible cooking oils |
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what is a 1a rating for class a
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1 and 1/4 gallons of water
2a would be 2 1/2 3a would be 3 and 3/4 |
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20 b rating for class b
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will extinguish 20 square feet of liquid
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class c rating
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will not conduct electricity then
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does class d have a numerical rating
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no
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obsolete extinguishers
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soda acid, foam, internal cartridge operated water and loaded stream, internal cartridge dry chem,
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portable extinguishers classified by
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types of fires and in some cases their performance capabilities
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which types of fire have numerical rating
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a and b
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class a numerical ranges
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1a to 40a
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class b numerical ranges
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1 to 640
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what is excluding oxygen?
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smothering
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afff creates
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a foam blanket and vapor seal on surface of fuel
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halon less than 9 lbs has what rating
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only b and c
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halon more than 9 has what rating
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a, b, and c
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co2 is most effective on what types
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b, and c not
discharge in form of gas displaces oxygen and smothers fire |
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inspecting extinguishers looking for
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accessible and serviceable and simplicity of operation
usually done by building owner or owners designee |
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Nfpa requires fire apparatus to be equipped with
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minimum with a dry chem with 80bc rating and 2 ½ gallon water type
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stored pressure water extinguisher
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water is stored in tank with either compressed air or nitrogen
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afff uses what nozzle
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different from stored pressure water in two ways
1.contains specified amount of afff concentrate mixed with water 2.has air aspirating nozzle to produce better quality of foam |
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dry chem can be
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ab rating or a,b,c rating
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stored pressure extinguisher should be
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200 psi
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Nfpa requires what to be on extinguishers
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pictographs
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using portable extinguishers PASS
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pull pin apply sweeping motion at base of fire after used all of extinguisher agent put it on side so know its already been used
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class d has what shape?
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yellow star
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shapes and colors for classes
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a=green triangle
b= red square c=blue circle d=yellow star k=black hectagon |
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is the More gently foam applied the more rapid extinguishment true or false?
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true
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foam proportinoer uses what principle
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venturi= forced water or air under pressure increase in velocity of fluid through orifice creates a pressure, the surrounding fluid is then under greater reassure and flows into the negative pressure
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saponification
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alkaline based chemicals mixed with grease creates soapy like film
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really white light burning in fire might tell ya what?
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class d metal magnesium
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do the inline eductor and air nozzle have to be the same gpm?
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yes
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foam extinguishes by
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-seperating
-cooling -smoothering -penetrating |
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methods to apply foam
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roll on-foam stream on ground near front edge of burning liquid
bank down- elevated object near spill, foam stream directed onto object and run onto surface of fuel.This method primarily in dike fires and fire involving transport vehicles -rain down method=primary technique used on above ground storage tank fires |
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class a foam and water tension
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special formulation of hydrocarbon surfactants that reduce water tension allowing better water penetration and increasing effectiveness
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which appliance is used for generation of low expansion foam?
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air aspirating foam nozzle
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if 1 extinguisher doesnt put fire out do what
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withdraw and reasses the situation
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high expansion
med expansion rates low epansion rates |
high 200:1 to 1000:1
med 20:1 to 200:1 low 20:1 |
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what percentage deficient in extinguisher weight do we remove it?
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10 percent
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can class b foams be used to suppress vapors that havent ignited yet?
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yes
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which method is used on dike fires and transport vehicle fires?
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bank down
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what type of foam is batch mixing most appropriate for?
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class a
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2 types of portable foam proportioners
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-in line foam eductors
-foam nozzle eductors |
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3 expelling agents for extinguishers
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manual pump
stored pressure pressure cartridge |
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Elements needed to produce ff foam
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Foam concentrate
Air Water Mechanical agitation |
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Class b foam designed solely for
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hydrocarbon fires will not extinguish polar solvent fires
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Fluoroprotein foams are better than straight protein foams? true or false
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true
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Proportioning methods of foam
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Induction
Injection Batch mixing Premixing |
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State law- extinguishers must be serviced
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once a year and after each use
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underwriter laboratories is ones who determine
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extinguisher ratings
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