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CFD 11 Month > IFSTA CH 6 - Portable Fire Extinguishers > Flashcards

IFSTA CH 6 - Portable Fire Extinguishers Flashcards

1
Q

fire extinguisher primarily intended use

A

for occupants to use on small, incipient fires or on fires in the early growth stage

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2
Q

classifications of portable fire extinguishers

A

are classified according tot he type of fire that each is designed to extinguish

there are five classes (A, B, C, D and K)

certain extinguishing agents are only effective on certain classes of fire or fuels

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3
Q

Class A

A

involve ordinary combustible such as:

textiles
paper
plastics
rubber
wood

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4
Q

Class A fire extinguishers are rated

A

from 1-A through 40-A

primarily based on the amount of water and the duration and range of the discharge used in extinguishing test fires

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5
Q

Dry chemicals

A

will also extinguish fires fueled by class A materials

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6
Q

Class B

A

involve flammable and combustible liquids and gases

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7
Q

Agents used to extinguish class B fires

A

include Carbon dioxide, dry chemicals and class b foam

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8
Q

flammable and combustible liquids and gases include

A

alcohol
gasoline
lubricating oils
liquefied petroleum gas (LPG)

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9
Q

Class B ratings range from 1-B through 640-B

A

the rating is based on the approximate square foot area of a flammable liquid fire that a nonexpert operator can extinguish using on full extinguisher

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10
Q

Class C

A

involves energized electrical equipment

rating confirms that the extinguishing agent will not conduct electricity

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11
Q

Class D

A

those involving combustible metals and alloys such as

titanium
magnesium
sodium
lithium
potassium

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12
Q

Magnesium fires

A

can be identified by the bright white emissions during the combustion process

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13
Q

Class D extinguishing agents

A

Dry powder

Class D extinguishers are only to be used on class D fires

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14
Q

Class K

A

involve combustible cooking oils such as vegetable or animal fats and oils that burn at extremely high temperatures

wet chemical systems and portable fire extinguishers are used to control and extinguish class k fires

Saponification

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15
Q

smothering

A

excluding oxygen from the burning process

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16
Q

cooling

A

reducing the burning material below its ignition temperature

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17
Q

chemical flame inhibition

A

interrupting the chemical chain reaction in the burning process

18
Q

saponification

A

forming an oxygen-excluding soapy foam surface

19
Q

manual pump extinguisher

A

the operator physically applies pressure to the pump that increases pressure within the container which forces the agent out a nozzle at the end of the hose

20
Q

stored pressure

A

compressed air or inert gas within the container forces the agent outa nozzle at the end of a hose when the operator presses the handle

21
Q

pressure cartridge

A

a separate cartridge on the side of the container contains an inert gas

when the operator punctures the cartridge seal, the expellant enters the container and forces the agent out a nozzle on the end of a hose

22
Q

pump-type water extinguishers

A

are intended primarily for use on ground cover fires although they may also be used for small class A fires

23
Q

stored-pressure water extinguishers

A

useful for all types of Class A fires

there are also useful for extinguishing confined hot spots during overhaul operations

24
Q

Stored-pressure water-mist extinguishers

A

used deionized water as the agent and nozzles that produce a fine spray instead of a solid stream

the deionized water makers these Class A extinguishers safe to use on energized electrical equipment

25
Q

stored pressure wet chemical extinguishers

A

they are intended for use on Class K fires involving cooking fats, grease and vegetable and animal oils in commercial kitchens

26
Q

Aqueous film forming foam (AFFF) extinguishers

A

are intended for class B fires

they are particularly useful in combating fires in or suppressing vapors from small liquid fuel spills

27
Q

AFFF differ from stored-pressure water extinguishers in two ways

A

AFFF tank contains a specified amount of AFFF concentrate mixed with the water to produce a foam solution

has an air-aspirating foam nozzle that aerates the foam solution, producing better quality foam than a standard extinguisher nozzle provides

28
Q

clean agent extinguishers

A

effectively cool and smoother fires in class A and B fuels and inhibit the sustained chemical reaction in class C fuels

the agents are nonconductive and can extinguish energized electrical equipment fires

halogenated extinguishing agents

29
Q

carbon dioxide extinguishers

A

are most effective in extinguishing class B and Class C fires

30
Q

Dry Chemical extinguishers

A

are for use on Class A-B-C and/or Class B-C fires

31
Q

dry powder agents are only for use on

A

Class D fires

32
Q

There are two basic types of dry chemical extinguishers

A

regular B-C rated

Multipurpose A-B-C rated

33
Q

two basic designs for handheld dry chemical extinguishers

A

cartridge-operated

stored-pressure

34
Q

cartridge-operated handheld extinguishers

A

employ a pressure cartridge connected to the agent tank

35
Q

stored-pressure handheld extinguishers

A

the agent stored tank maintains a constant pressure of about 200 psi

36
Q

wheeled units

A

Class A, B and C fires

position the unit and then extend the hose

37
Q

Dry powder extinguishers

A

fires involving class D combustible metals require special dry powder extinguishing agents and application techniques

38
Q

selecting the proper fire extinguishers, consider

A

classification of the burning fuel
hazards to be protected against
atmospheric conditions
ease of handling the extinguisher
rating of the extinguisher
size and intensity of the fire
availability of trained personnel to operate
any life hazard or operational concerns

39
Q

when inspecting an extinguisher immediately before use, check the following

A

external condition - no apparent damage

hose/nozzle - in place

weight - feels as though it contains the agent

pressure gauge (of available)

40
Q

PASS application method

A

pull
aim
squeeze
sweep

41
Q
A

CFD 11 Month (32 decks)

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