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Flashcards in IFSTA(5th)-Chapter 6 Deck (78):
0

Portable Fire Extinguishers are designed to b used on _______ fires.

incipient or early growth

1

NFPA 10

Std. for Portable Fire Extinguishers

2

extinguishing agents work by at least one of the following mechanisms

smothering
cooling
interrupting the chemical reaction
saponification

3

NFPA 1901

Std. for Automotive Fire Apparatus

4

NFPA 1901 requires _____ approved port. fire extinguishers with ______ .

2
mounting brackets

5

NFPA 1901 requires at least a rating of ______ for a dry chemical extinguisher and a _______ rating for a CO2 extinguisher.

80 B:C
10 B:C

6

NFPA 1901 also requires one ______ water extinguisher for class A fires.

2.5 gallon or larger

7

Water Extinguishers r 4

class A fires

8

AFFF is for ____

class A or B fires

9

Halon 1211 and Halon 1301 r 4

class B or C fires

10

Clean Agent FE-36 is for _____

class A, B, or C fires

11

CO2 is used for _____

class B or C fires

12

Dry Chemical Extinguishers r 4 ___

class B or C fires

13

Multi-purpose dry chem. is for ___

class A, B, or C fires

14

Dry Powder is used for _____

class D fires

15

Wet Chemicals such as Potassium Acetate are used for _____ .

class K fires

16

4 different dry chemical agents

sodium bicarbonate
potassium bicarbonate
potassium chloride
ammonium phosphate

17

Multi-Purpose Dry Chem. agent

monoammonium phosphate

18

extinguishing agents primary method of extinguishment

water - cooling
CO2/Foam/Wet Chem/Dry Powder - O2 depletion
clean agent/dry chem - interrupts chemical reaction

19

3 expelling mechanisms

manual pump
stored pressure
pressure cartridge

20

Class A extinguishing agents

water
class A foam or AFFF
clean agents
dry chemical

21

Class B extinguishing agents

CO2
class B foam (AFFF for example)
dry chemical
halon
clean agents

22

Class C extinguishing agents

dependent on what is burning. first, de-energize electrical source

23

Class D extinguishing agents

dry powders

24

Class K extinguishing agents

wet chemicals

25

Conductivity

ability of a substance to conduct an electrical current.

26

Alloy

mixture of two or more metals (or a metal and a non-metal) that are fused/dissolved into each other to enhance the properties of the base metal.

27

APW extinguishers

air pressurized water extinguishers

28

Water Mist stored pressure extinguishers use ________ as the agent and produces a ______ instead of a solid stream. They are ______ to use on class C fires.

de-ionized water
fine mist
safe

29

AFFF

aqueous film-forming foam
when combined with water it forms a complete vapor barrier over fuel spills and fires.
highly effective on hydrocarbon fuels.
ineffective on polar solvents (flammable liquids that r water-soluble).
AKA "light water"

30

Air-Aspirating Foam Nozzle

designed to provide aeration to provide the highest quality foam

31

AFFF can be applied by

raining down
deflection

32

EPA

environmental protection agency

33

5 facts about "clean agents"

are discharged as a rapidly evaporating liquid that leaves no residue.
are non-conductive so they can be used on class A, B, and C fires.
pressurized with argon gas.
approved by the EPA.
are designed to specifically replace Halon 1211.

34

4 examples of clean agents

HCFC-hydrochloroflourocarbon
HFC-hydrofluorocarbon
PFC-perflourocarbon
FIC-flouroidiocarbon

35

CO2 is stored under ______ as a liquified gas ready for release at any time.

it's own pressure

36

CO2 discharges at _____ temp.

subzero

37

2 reasons not to touch a CO2 horn during discharge

static electricity builds up
subzero temp.

38

Dry chemicals are mixed with _____ during manufacture to prevent caking.

small amounts of additives that make them resistant to moisture

39

Corrosive Materials

gas, liquid, or solid material that can burn, irritate, or destroy human skin and can severely corrode steel.

40

Cartridge-Operated extinguishers

employ a pressure cartridge that pressurizes the tank after a plunger is pushed.

41

2 types of cartridge-operated extinguishers

CO2
dry nitrogen(for freezing temps)

42

Wheeled dry chem extinguishers must have their _____ before the extinguisher is pressurized.

hoses deployed

43

Wheeled dry chem extinguishers have ______ nozzle reaction.

significant

44

Dry powder is applied _______

gently and in sufficient depth to create a smothering blanket.

45

What extinguishing agent when applied to class D fires causes a violent reaction, intensifies combustion, and causes bits of molten material to spatter?

water

46

performance capability

the # on an extinguisher

47

UL

underwriters laboratories inc.

48

Class A ratings

1A-40A
A=1.25gallons of water would b required

49

Class B ratings

1B-640B
B=1 square foot of a class B fire that a non- expert can extinguish.

50

For an extinguisher to be rated for Class C fires, the extinguishing agent must be _______ .

non-conductive

51

Extinguishers are classified for their _______ .

intended use

52

Wood cribs

water used to extinguish fires in these cribs determine class A ratings

53

Class D extinguishers are not given a _______ and _______ be used on any other class fire.

rating
cannot

54

2.25 square feet

minimum surface area of a cooking fire that must be extinguished to meet the minimum criteria for a class K rating.

55

Class of Fire Symbols

A=green triangle
B=red square
C=blue circle
D=yellow star
K=black hexagon

56

Extinguishers suited for______ are identified by combinations of letters and numbers.

more than 1 class of fire

57

8 factors to selecting the proper fire extinguisher

class of fire
rating of extinguisher
hazards to be protected
size and intensity if fire
atmospheric conditions
life hazards/operational concerns
ease of handling
availability of trained personnel

58

Operate an extinguisher from _____ the fire and your exit.

between

59

4 checks of an extinguisher prior to immediate use

is it pressurized
weight(is the agent inside?)
hose/nozzle in place
external condition

60

Approach fires from ____wind.

up

61

PASS

pull
aim
squeeze
sweep

62

After an extinguisher has been completely discharged, _____ .

lay it on its side

63

How often must extinguishers be inspected?

at least annually

64

3 factors that affect the value of an extinguisher

serviceability
accessibility
ease of use

65

8 checks for a fire extinguisher inspection

in proper location and accessible.
nozzle/horn for cracks/obstructions/dirt/grease.
extinguisher cylinder for damage.
legible operating instructions.
check locking pin/tamper seal.
full of agent and fully pressurized.
inspection tag current.
condition of hose/fittings.

66

29 CFR 1910.157 Subpart "L" (c) (5)

required employers to remove all obsolete extinguishers by January 1982

67

Halogenated Agents

halogenated hydrocarbons that contain carbon plus one or more elements from the halogen series.

68

Halogenated Agents are usually installed to protect _______ .

highly sensitive computer equipment

69

Halon

generic term for halogenated hydrocarbons

70

Halon fire extinguishers are ______ allowed.

no longer

71

Halogenated Agents extinguish fire by ______ .

interrupting the chemical chain reaction

72

halogenated vapor is ______ .

non-conductive

73

Halons _____ leave any residue.

do not

74

Halon 1211

bromochlorodifluoromethane.
replaced by FE-36 hexaflouropropane.

75

Halon 1311

bromotrifluoromethane.
replaced by FE-241 chlorotetrafluoroethane and FM-200 heptafluoropropane.

76

Do not use _______ in unvented, confined spaces because they might decompose and create toxic components.

halogenated agents

77

3 most common fire extinguishers

ABC
AB
BC