Chapter 6

What was the best selling movie the year you were born?

(Movies were still silent when chief was..... ooops...delete....delete....)

Class K Fire

Fires in cooking appliances that involve combustible cooking media, such as vegetable or animal oils and fats; commonly occurring in commercial cooking facilities such as restaurants and institutional kitchens. (K is for KITCHEN) :-)

Class C Fire

Fires involving energized electrical equipment.

Class A Fire

Fires involving ordinary combustibles such as wood, paper, cloth, and similar materials.

Class D Fire

Fires of combustible metals such as magnesium, sodium, and titanium.

Class B Fire

Fires of flammable and combustible liquids and gases.

Which of the following is a commonly used dry chemical?

Sodium bicarbonate

True or False. Dry powder extinguishing agent should be applied gently to avoid breaking the crust that may form over burning metal.

True

True or False: A portable fire extinguisher should be used only for the fire type or types for which it is intended.

True pg 266

True or False. Dry chemical agent application may result in a cloud of airborne particulate that may reduce visibility and create respiratory problems.

True. While the agents themselves are nontoxic and generally considered safe to use, the cloud may reduce visibility and create respiratory problems.

Which portable fire extinguisher would be safe to use on energized electrical equipment?

Water mist stored-pressure extinguishers

Which type of extinguisher: Agent is deionized water and nozzles produce a fine spray. 261

Water mist stored-pressure extinguishers. (Never attempt to refill/recharge without chief's knowledge. EVER.)

Which type of extinguisher: Contain a special potassium-based low-pH agent; intended for use on Class K fires 261

Wet chemical stored-pressure

The finished foam of an aqueous film forming foam extinguisher floats on the surface of fuels that are (blank) than water. 262

lighter

Empty extinguishers should be laid on their (blanks). 268

sides

Smothering

Act of excluding oxygen from a fuel.

Class A + B fire extinguishers are classified with letter and (blank) ratings. 254

numerical

Extinguishing Agent

Any substance used for the purpose of controlling or extinguishing a fire.

Which type of extinguisher: Useful in combating fires in or suppressing vapors from a liquid fuel spill. 261

Aqueous film forming foam (AFFF)

Class of Fire: Fires that involve energized electrical equipment.256

Class C

Match ext agent to fire class: Once power supply has been turned off or disconnected, firefighters can treat the fire as a fire involving ordinary combustibles or flammable and combustible liquids and gases. 256

Class C

Class of Fire: Fires that involve combustible metals and alloys such as titanium, lithium, and magnesium. 256

Class D

Match ext agent to fire class: Dry Powder 263

Class D

For which classification of fire do portable extinguisher ratings take into account the reactions between the metal and the agent?

Class D 257

Class of Fire: Fires that involve combustible cooking oils such as vegetable or animal fats. 258

Class K

Match ext agent to fire class: Wet chemical agents. 258

Class K Fire

Which type of extinguisher: Effectively cool and smother fires in class A and B fuels: developed to replace Halons. 262

Clean Agent

The use of water or water-based agents on Class (blank) fires will cause the fire to react violently, emit bits of molten metal, and could injure nearby firefighters. 257

D

Which type of extinguisher: For use on Class A-B-C fires and/or Class B-C fires; among the most common extinguishers in use. 263

Dry Chemical

Which type of extinguisher: For use on fires involving Class D combustible metals. 264

Dry Powder

Which type of extinguishing agent may need to be applied with a scoop or a shovel?

Dry chemical

Which portable fire extinguisher is available in handheld and wheeled units and has two basic designs: cartridge-operated and stored-pressure?

Dry chemical Extinguishers (page 264*workbook is wrong)

What is the difference between dry chemical extinguishers and dry powder extinguishers?

Dry chemical agents are for use on Class A-B-C fires and/or Class B-C fires and dry powder extinguishers are only for use on Class D fires.

Dry Powder

Extinguishing agent suitable for use on combustible metal fires.

Wet Chemical System

Extinguishing system that uses a wet chemical solution as the primary extinguishing agent; usually installed in range hoods and associated ducting where grease may accumulate.

True or False: Class C extinguishing agents are capable of conducting electricity.

False. Class C extinguishing agents will not conduct electricity. pg256

True or False. Clean agent extinguishers should not be used to extinguish fires in energized electrical equipment.

False. Clean agent extinguishers can be used to extinguish fires in energized electrical equipment. 262

True or False. Any dry powder extinguishing agent can be used on any combustible metal.

False. No single dry powder agent will control or extinguish fires in all combustible metals. 264

True or False. When using an Aqueous Film Forming Foam (AFFF) Extinguisher the operator should apply foam directly on the fuel.

False. When using an Aqueous Film Forming Foam (AFFF) extinguisher the operator should not apply foam directly on the fuel. 262

True or False. When using a portable fire extinguisher, the operator should approach a fire from the leeward side.

False: Windward side. Approach the fire from upwind; that is, with the wind at your back. Once in position to attack the fire, use the PASS application method. 267

Water Mist Extinguisher

Fire extinguisher capable of discharging atomized water through a special applicator; pressurized water mist extinguishers use distilled water, whereas back-pump water mist extinguishers use ordinary water.

Air-Aspirating Foam Nozzle

Foam nozzle designed to provide the aeration required to make the highest quality foam possible; most effective appliance for the generation of low-expansion foam.

A clean agent that does not harm the ozone layer and provides U.S. Environmental Protection Agency (EPA)-approved alternative to Halons is (blank). 262

Halotron

Which combustible metal is often used in cameras and laptops and can be identified by bright white emissions during the combustion process? 257

Magnesium

For which method of expelling portable extinguisher contents does the operator apply pressure to a pump that increases the pressure within the container?

Manual pump 260

Explain the PASS application method for portable fire extinguishers.

P — Pull pin breaking thin wire or plastic seal A — Aim nozzle at base of fire S — Squeeze handles together to release short burst to test extinguisher, then squeeze continuously to release agent S — Sweep nozzle back and forth to cover burning material

Saponification

Phenomenon that occurs when mixtures of alkaline based chemicals and certain cooking oils come into contact, resulting in the formation of a soapy film

Fire Extinguisher

Portable fire fighting device designed to combat incipient fires.

Which type of extinguisher: Intended primarily for use on ground cover fires; operators usually wear extinguishers on their backs. 261

Pump-type water

For which method of expelling portable extinguisher contents does compressed air or inert gas within the container force agent out a nozzle?

Stored Pressure

Which type of extinguisher: Useful for small Class A fires and extinguishing confined hotspots during overhaul; tanks store water and compressed air or nitrogen. 260

Stored-Pressure water

Aqueous Film Forming Foam (AFFF)

Synthetic foam concentrate that, when combined with water, can form a complete vapor barrier over fuel spills and fires and is a highly effective extinguishing and blanketing agent on hydrocarbon fuels.

What items should be checked immediately before using a portable fire extinguisher?

• External condition — No apparent damage • Hose/nozzle — In place • Weight — Feels as though it contains agent • Pressure gauge (if available) — Should register reading within operable range

When using a portable fire extinguisher, ensure that there is a clear (blank) for immediate escape. 268

exit

Describe the four methods used to extinguish fires.

• Smothering — Excluding oxygen from burning process • Cooling — Reducing burning material below its ignition temperature • Chemical flame inhibition — Interrupting chemical chain reaction in burning process • Saponification — Forming oxygen-excluding soapy foam surface

Which portable fire extinguisher is most effective on static pools of flammable liquids?

AFFF extinguishers

Dry Chemical

Any one of a number of powdery extinguishing agents used to extinguish fires.

Which portable fire extinguisher uses gas that displaces available oxygen and smoothers the fire?

Carbon Dioxide

Which type of extinguisher: Available as handheld and wheeled units; most effective in extinguishing class B and Class C fires. 262

Carbon Dioxide

Which portable fire extinguisher has a gaseous discharge that usually forms dry ice crystals?

Carbon dioxide. (also know as carbon dioxide 'snow')

Halogenated Extinguishing Agents

Chemical compounds (halogenated hydrocarbons) that contain carbon plus one or more elements from the halogen series. Halon 1301 and Halon 1211 are most commonly used as extinguishing agents for Class B and Class C fires.

Class of Fire: Fires that involve ordinary combustibles such as textiles, paper, plastics, rubber and wood. 255

Class A

Match ext agent to fire class: Water, water-based agents and dry chemicals (255)

Class A

What is added to stored-pressure water extinguishers to increase their effectiveness on fires such as deep-seated upholstered furniture fires?

Class A foam

Class of Fire: Fires that involve flammable and combustible liquids and gases. 256

Class B

Match ext agent to fire class: Carbon dioxide, dry chemicals and the correct class of foam. 256

Class B

Fires involving lubricating oils and liquified petroleum gas (LPG) are classified as

Class B fires

True or False: Portable fire extinguishers are often suitable for more than one class of fire.

True pg254

True or False: Water and water-based agents cannot be used on a Class C fire until the electricity has been shut off.

True. Class C extinguishing agents will not conduct electricity which makes them suitable for electrical fires. Once the power supply has been turned OFF or DISCONNECTED, you can treat the fire as a Class A or B fire.

When using a portable fire extinguisher, apply the agent from a point where it reaches...

but does not disturb the fuel surface

When selecting a portable fire extinguisher for use in areas with sensitive computer equipment, select (blank) agent or carbon dioxide extinguishers. 266

clean *Study this and understand it*

Portable fire extinguishers are identified in two ways: geometric shapes and (blank). 254

pictographs

Class K rated portable extinguishers work because of

saponification

Extinguisher ratings for Class A portable fire extinguishers are based primarily on the amount of (blank) and the duration and range of discharge used in extinguishing test fires. 255

water

List factors to consider when selecting the proper portable fire extinguisher.

• Classification of burning fuel • Rating of extinguisher • Hazards to protect • Size, intensity of fire • Atmospheric conditions • Availability of trained personnel to operate extinguisher • Ease of handling extinguisher • Life hazard or operational concern