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Fire Inspection And Code Enforcement > 10 Special Agent Extinguishing Systems > Flashcards

10 Special Agent Extinguishing Systems Flashcards

1
Q

For a special. Agent system to be considered effective or successful it must do what

A

Completely extinguish the fire

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2
Q

Different types of special agent systems

A 
Dry chem
Wet chem
Clean agent
Co2
Foam
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3
Q

Class of fire normally involving commercial kitchens, deep fryers and food prep areas where oil and grease can ignite

A

Class k

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4
Q

The method class k extinguishers work, agent turns fats and oils into a soapy form that extinguishes fire

A

Saponification

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5
Q

When is a dry chem system used

A

Whenever rapid extinguishment is required and reigniting is unlikely

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6
Q

Dry chem systems are commonly found where

A 
Flammable liquid storage areas
Dip tanks
Paint spray booths
Commercial cooking areas
Kitchens
Exhaust ducts
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7
Q

Dry chem system consisting of storage tanks expellant storage tanks heat detection and activating system, piping and nozzles

A

Fixed system

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8
Q

Two types of fixed system

A

Local application

Total flooding

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9
Q

Type of fixed dry chem system that discharges agent onto specific surface like cooking area. Most common type

A

Local application

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10
Q

Type of fixed dry chem system that introduces a thick concentration of agent into a closed area like a spray booth

A

Total flooding

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11
Q

Dry Chen system is not recommended for what type of area

A

Sensitive electrical equipment, because of the mess

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12
Q

Aka ordinary dry chem, effective against class b and c fires

A

Sodium bicarbonate

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13
Q

When evaluated against an equal weight of co2, sodium bicarbonate is how many times more effective on class b fires

A

Twice

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14
Q

Sodium bicarbonate in systems is treated to be water repellant and

A

Free flowing

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15
Q

Aka multipurpose dry chem (pale yellow in color) effective on class a,b,c fires

A

Monoammonium phosphate

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16
Q

How does monoammonium phosphate behave on class a fires

A

It melts forming a solid coating to smother fire

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17
Q

Dry powders are designed for what type of fire

A

Class d

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18
Q

True false no single agent is effective against all combustible metals

A

True

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19
Q

Sodium bicarbonate based Sargent with additives to enhance flow. Designed specifically for sodium, potassium, and sodium potassium alloy fires

A

Na-x

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20
Q

Na-x forms a cake like crust on the metal and is rated up to what temp

A

1400f

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21
Q

Sodium chloride (salt) based agent intended for use on magnesium, sodium and potassium fires and is applied slowers to bury the materials involved

A

Met-L-x

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22
Q

Graphite based agent that extinguishes fires by conducting out heat away from fuel. Developed for lithium but also effective against sodium magnesium and zirconium, does not form a crust

A

LITH-x

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23
Q

Any number of inert gasses compressed to force extinguishing agents from an extinguisher, nitrogen is most common

A

Expellant gas

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24
Q

Dry Chen system component that may contain both the agent and expellant gas or either. Commonly nitrogen or co2, storage ranging from 30-100 lbs

A

Storage container for expellant gas and or agent

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25
Q

Critical feature and limitation of special agent systems

A

Quantity of agent in the system

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26
Q

Of a system is controlled by a fusible link, the link should be replaced how often

A

At least annually or by manufacturer recommendations

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27
Q

Dry Chen storage containers that are less and 150 lbs should be hydro tested how often

A

Every 12 years

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28
Q

True false. Dry chem storage cylinders larger than 159 lbs have no hydrostatic testing requirements

A

True

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29
Q

What type of extinguishing systems is best suited for applications in commercial cooking hoods, plenums, ducts and associated cooking appliances

A

Wet chem

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30
Q

Wet chem systems are most effective on fires in

A

Deep fryers

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31
Q

Primary difference between dry and wet chem

A

Type of agent used.

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32
Q

Wet chem agents are typically composed of water and either

A

Potassium carbonate, potassium citrate or potassium acetate.
Potassium is abbreviated as K. CLASS K FIRES

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33
Q

Inspection and testing of systems should include

A

All parts in right location
All actuators unobstructed
tamper indicators intact
Maintenance tags up to date

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34
Q

Clean agents will conduct electricity true false

A

False they won’t conduct

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35
Q

Clean agents are used for what classes of fire

A

Class a b c

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36
Q

Clean agents are stored as liquids and turn to gas when exposed to

A

The air

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37
Q

Clean agents are used in what type of rooms

A 
Mri
Archives
Art galleries
Aircraft engines
Irreplaceable documents or storage items 
sensitive electronics
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38
Q

Clean agents leave no residue and work by

A

Cooling, smothering fire and displacing oxygen

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39
Q

Halogenated agents contain atoms from halogen elements such as

A

Fluorine chlorine bromine and iodine

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40
Q

Halogenated agents are effective against what classes of fire

A

B and c

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41
Q

Halon agents haven’t been manufactured since 1994 except

A

In certain exclusions to the Montreal protocol of 1987

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42
Q

Two types of halon still in use

A

Halon 1211

Halon 1301

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43
Q

Halon 1211 is most commonly found in what

A

Portable extinguishers

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44
Q

Halo carbon agents that are available commercially now

A

Hydrochlorofluorocarbon hcfc

Hydrofluorocarbon hfc

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45
Q

Halocarbon agents that rapidly evaporates when released. Limited class a rating in exit guises over 9 lbs

A

Halotron

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46
Q

A 28 lb Halotron extinguisher is given a rating of

A

2a:10bc

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47
Q

Acceptable replacement for halon 1301 but requires more

A

Fm200

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48
Q

Blend of three inert gasses, nitrogen ,argon and co2

A

Inergen

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49
Q

Hydrofluorocarbon based agent that is non conductive non corrosive and residue free and zero ozone hazard. Human exposure for 5 min

A

Ecaro 25

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50
Q

Halon agent developed by DuPont to replace 1301 and 1211. Made of HFC-236fa

A

FE-36

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51
Q

Clean agent systems must be tested how often by qualified personnel

A

Annually

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52
Q

Contents and pressure of clean agents need to be inspected how often

A

Semiannually

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53
Q

Clean agent systems need to be hydro tested every

A

5 years

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54
Q

Co2 is how cold

A

-110 f

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55
Q

Most serious problem involving co2 systems is

A

Personal safety

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56
Q

Total flooding system of co2 is designed to deliver what percent of co2 in an enclosed area. Meaning the atmosphere will be what percent co2 after discharge

A

34%

57
Q

Total flooding systems must be equipped with what type of alarm

A

Pre discharge alarm

58
Q

Three means of co2 system actuation

A

Automatic operation
Normal manual
Emergency manual

59
Q

Automatic operation of co2 system

A

Triggered by product of combustion detector

60
Q

Normal manual operation co2 system

A

Triggers by person manually operating control device

61
Q

Emergency manual operation co2 system

A

Discharge immediately without advanced warning to area

62
Q

High pressure co2 tanks are at what psi

A

850 psi

63
Q

Low pressure co2 tanks are designed to protect large hazards. Liquefied co2 is stored in large tanks refrigerated and stored at what temp and pressure

A

Temp 0F and 300 psi

64
Q

What type of co2 nozzle promotes better distribution of material

A

High pressure

65
Q

A foam extinguishing system is used when water alone may not be sufficient. Examples of locations are

A

Aircraft hangars
Flammable liquid storage
Paper and textiles storage

66
Q

Foam systems extinguish using any of the four following methods

A

Smothering
Separating
Cooling
Suppressing

67
Q

Foam extinguishment by suppressing is

A

Preventing the release of flammable vapors

68
Q

Foam extinguishing method by separating is

A

Intervenes between fuel and fire

69
Q

Type of foam system that is pipes from a central foam station and automatically discharges from through delivery outlets

A

Fixed system

70
Q

Most fixed foam systems have unlimited water supplies and are of what type of function

A

Deluge

71
Q

Prepped system for foam where there is no permanent source attached. Requires interventions form brigade or department. Commonly found at oil refineries

A

Semi fixed type a system

72
Q

When surface application of foam may not be effective, foam injected at the base of a burning storage tank is what type of foam system

A

Subsurface injection system

73
Q

Foam solution is delivered through pipes to a hydrant, throughout facility, for use with hose lines. Permanently attached foam source but doesn’t apply foam to fire

A

Semi fixed type b

74
Q

Total flooding type of foam system that is either automatic or manual. Foam is generated by motors or water pressure. Aircraft hangars and shipboard engine rooms

A

High expansion foam system

75
Q

Basically a deluge sprinkler system with foam introduced with limited foam concentrate available. Continues as water once foam runs out.

A

Foam-water system.

76
Q

Raw foam liquid before introduction on water. Usually 5 or 55 gallon.

A

Foam concentrate.

77
Q

Device that introduces correct amount of concentrate into water to make foam solution

A

Foam proportioner.

78
Q

Homogenous mixture of foam concentrate and water before air introduction

A

Foam solution

79
Q

Completed product once air is introduced into solution

A

Foam, aka finished foam.

80
Q

Four elements to make high quality foam

A

Concentrate, water, air, mechanical agitation

81
Q

Class b foam is used at what concentrations

A

1,3 and 6 percent.

82
Q

Hydrocarbon fires require what foam concentrations

A

1-6 percent

83
Q

Polar solvent fuels, like alcohols, require what percent foam

A

3-6 percent

84
Q

Medium and high expansion foams are used at what percent

A

1, 1.5, 2, or 3 percent.

85
Q

Finished foam is what percent water

A

94-99.5%

86
Q

Type of foam expansion for liquid fuels and vapor suppression, for liquid fuel temp not exceeding 212F

A

Low expansion

87
Q

Low expansion fuel has an air solution ratio of

A

7:1 to 20:1

88
Q

Type of foam expansion when rapid vapor suppression is needed

A

Medium expansion

89
Q

Medium expansion foam expansion ratios

A

20:1 to 200:1

90
Q

Foam expansion type for space filling in hard to reach areas and total flooding.

A

High expansion foam

91
Q

High expansion foam expansion ratio

A

200:1-1000:1

92
Q

Type of foam concentrate that is based on hydrolysis protein solids and fortified with fluoronated surfactants that enable the foam to shed or separate from hydrocarbons

A

Fluoroprotein foam

93
Q

Foam concentrate type based on fluoroprotein foam and AFFF capabilities for fast extinguishment and long lasting effects

A

Film forming fluoroprotein FFFP

94
Q

Foam concentrate with fluorinated surfactant added to detergent . Causes water to drain from foam blanket and float on top of hydrocarbon

A

Aqueous film forming foam AFFF

95
Q

Foam with reduced surface tension that has good penetrating abilities, capable of being used in normal fog nozzle for low expansion

A

AFFF

96
Q

Synthetic based foam that foams a membrane over polar solvent fuels, separating foam blanket from attack of solvent

A

AR-AFFF

Alcohol resistant aqueous film forming foam

97
Q

Two types of AR-AFFF

A

One type is 1% for hydrocarbon and 3% for polar solvents

Other is 3% hydrocarbon and 6% polar

98
Q

Foam concentrate type that has low moisture content and is suitable for pesticide fires and suppressing vapors of fuming acids.

A

Medium and high expansion foam

99
Q

Type of foam proportioner that has a foam concentrate line connected to each fire pump discharge outlet or to the system riser providing equal pressure as the water from the fire pump

A

Balanced pressure proportioner

100
Q

Advantages of balanced pressure proportioner

A

Ability to monitor demand and adjust

Ability to discharge foam from some outlets and water form others

101
Q

Proportioner with small return line or bypass from discharge side of fire pump back to intake side of fire pump with an eductor

A

Around the pump proportioner

102
Q

This type of proportioner is especially useful when ther is low water pressure or when a separate motor and concentrate pump is not available. Type built into fire apparatus

A

Around the pump proportioner

103
Q

Disadvantages of a prune the pump proportioner

A

Pump dedicated solely to foam operation

Can’t take advantage of incoming pressure, anything over 10 psi water inlet and concentrate won’t enter pump

104
Q

Proportion in system consisting of foam concentrate tanks connected to both water supply and foam solution lines in the system. Small amount of water pumped into concentrate tanks

A

Pressure proportioning system

105
Q

Proportioner consists of two positive displacement rotary gear pumps mounted pt the same shaft. One for concentrate other for water.

A

Coupled water motor pump proportioner

106
Q

Type of proportioner used in fixed systems. Limited to two sizes both at 6% foam.

A

Coupled water motor pump proportioner

107
Q

Two types of gpm flow from coupled water motor pump proportioner

A

60-180 gpm

200-1000 gpm

108
Q

What class extinguishers receive a number to indicate extinguishing capacity

A

Class a and b

109
Q

Class a extinguishers are rated from 1a to

A

40a

110
Q

Class b extinguishers are rated from 1b to

A

640 b

111
Q

Class b extinguisher ratings are based on the approximate area in square feet of

A

2 inches of heptane in a 8 inch deep pan

A 10 b can extinguish 10 square feet

112
Q

No numerical rating is Given to class c extinguishers, instead they are tested for

A

Electrical non conductivity

113
Q

What is the rating given for class d extinguishers

A

There is no rating given, it Gary’s based on extinguishing agent

114
Q

In the pictorial system of extinguisher labeling, blue indicates the type of fire it can be used for. What indicates inability to use

A

Absent picture or blacked/ grey picture with red line through it

115
Q

Letter symbol for class a extinguisher

A

Green triangle

116
Q

Letter symbol for class b extinguisher

A

Red square

117
Q

Letter symbol for class c extinguisher

A

Blue circle

118
Q

Letter symbol for class d extinguishers

A

Yellow star

119
Q

Letter symbol for class k extinguishers

A

Black hexagon

120
Q

Maximum size of water can considered portable

A

5 gallon

121
Q

Frequently used dry chem agents for portable extinguishers

A 
Sodium bicarbonate
Potassium bicarbonate
Monoammonium phosphate (multi purpose)
Urea potassium bicarbonate
Potassium chloride
122
Q

Type of extinguisher that contains expellant gas and extinguishing agent in a single chamber. Pressure forces agent thorough siphon tube

A

Stored pressure extinguisher

123
Q

Type of extinguisher that expels agent by manual pump operating

A

Pump operated extinguisher

124
Q

Occupancy in which the amount of ordinary combustibles present a small expected fire. School church assembly hall

A

Light hazard occupancy

125
Q

Occupancy hazard in which amount of combustible would create incipient fire of moderate size. Parking garages, mercantile, light manufacturing

A

Ordinary hazard occupancy

126
Q

Occupancy hazard where amount of combustibles present a rapidly spreading fire. Auto repair, paint shops, flammable liquid storage

A

Extra hazard occupancy

127
Q

Fire extinguisher requirement for light hazard

A

2a per 3000 ft2

128
Q

Fire extinguisher requirement for ordinary occupancy hazard

A

2a per 1500 ft2

129
Q

Fire extinguisher requirement for extra hazard occupancy

A

4a per 1000 ft2

130
Q

In all occupancies, the maximum travel distanced to a class a extinguishers is

A

75 ft

131
Q

Determination point of class b spill for being “with” or “without depth”

A

Less than 1/4” is without

More than 1/4” is with depth

132
Q

Maximum recommended travel distance to a class d extinguishers

A

75 ft

133
Q

In areas where class k fires are likely the maximum travel distance to an extinguisher is

A

30 ft

134
Q

Extinguishers less than 40 lbs should be how high off the ground.

A

Top of extinguisher not more than 5 ft above floor

135
Q

Extinguishers greater than 40 lbs except wheeled types should be mounted how high above floor

A

Top of extinguisher No more than 3.5 ft above floor

136
Q

Clarence from bottom of extinguishers to the floor should never be less than

A

4 inches

137
Q

What types of antifreeze can’t be used in stainless extinguisher bodies

A

Ethylene glycol and calcium chloride

138
Q

Antifreeze cannot be added to what type of extinguisher

A

AFFF extinguishers

139
Q

While monthly extinguisher inspections is the property owners responsibility, who’s responsibility is it to verify this is taking place

A

Responsibility of jurisdiction fire inspector

Fire Inspection And Code Enforcement (13 decks)

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