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Defining a fire as small that necessitates the use of a fire extinguisher is....
NOT a clear cut decision
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Classes of fire extinguisher/fires
- A- ordinary combustibles; wood,plastic,cloth,rubber
- B- flammable liquids
- C- electrical fires
- D- combustible metals
- K- kitchen fires, cooking oils
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pressurized extinguishers use a to propel the agent out of the container
propelling gas
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Tests for extinguishers
- A- wood crib test, wood paneling, and excelsior test
- B- pan of flammable liquid (heptane). size of pan determines rating
- C- test conductivity of agent, nozzle, and hose
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PASS
- Pull pin
- Aim nozzle
- Squeeze handle
- Sweep the base of the fire
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hydrostatic test
pressure test to ensure unit will not explode when operated. Testing period ranges form 5 to 12 years.
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The must be taken into account when selecting a fire extinguisher.
building/environment
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What type of extinguishers use a cartridge to pressurize them?
Ansul; cartridge-operated extinguishers. class D dry powder. used when agent may cake excessively and needs to be stirred.
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When choosing the size of extinguisher.....
best to choose the larger one
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Agents used in each class of extinguisher
- A- water, multi purpose dry chemicals
- B- Carbon Dioxide (CO2), regular and multipurpose dry chemicals, and foam
- C- Carbon Dioxide (CO2), regular and multipurpose dry chemicals
- D- Dry powders that are specific to the metal
- K- Wet chemicals, potassium carbonate based chemical
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First factor to consider when choosing an extinguisher?
The type and amount of fuel present
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loaded stream extinguisher
agent added to water, can combat freezing problem with an alkali salt as an antifreeze agent
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A 1-A rated extinguisher should....
extinguish about 1 cubic foot of wood cribbing
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pressurized water or foam extinguisher should reach...
about 20 feet
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stored pressure extinguishers were designed to be....
carried upright
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electronic monitoring
a method of electronic communication between an in-place extinguisher and an electronic monitoring device/system
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FF inspection of extinguisher is usually...
Visible inspection
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Alkali salts can be used to...
prevent water from freezing
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AR=
Alcohol Resistant foam- foam containg polymer that forms protective layer between burning surface and foam. prevents breakdown
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Most extinguishers have a....
pressure gauge
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Pump tank extinguishers utilize...
a plunger
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AFFF & FFFP extinguishers with air-aspirating nozzles have....
an anti-overfill tube
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What does the number rating of extinguishers mean?
ratings increase as the amount of fire suppressed increeases
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What type of fires are extinguishers meant to combat?
- small, unusual fires that cannot be reached quickly with hoselines
- have limited capabilities and are usually a first aid method of fire extinugishment
- small fires in the growth stage
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When confronted with a dog use what extinguisher?
CO2 carbon dioxide
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Where are pressurized water extinguishers usually recharged?
fire stations
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How many gallons do most portable water extinguisher contain?
2.5 gallons
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How often should extinguishers in buildings be checked?
every 30 days or electronically monitored
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Who sets requirements of size,type,and location of extinguishers?
Fire Prevention Bureau
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Many facilities that have Class D fuels have...
QRT Quick response team
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All halon production has been banned by...
Montreal Protocol on Substances that Deplete the Ozone Layer
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signs for fire classes
- A- green triangle
- B- red square
- C- blue circle
- D- yellow star
- K- black stop sign
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Clean agents are....
gases that do not conduct electricity or leave residue
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Testing of extinguishers is usually conducted by...
Underwriters laboratories, factory mutual research corporation, or coast guard
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obsolete extinguishers...
soda acid, chemical foam, carbon tetrachloride, cartridge, copper or brass
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Dry powder and dry chemical agents (can/cannot) be used interchangably.
cannot
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extinguishers in use today require inverting prior to use.
none, few
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___ is the basic extinguishing agent for Class A materials.
water
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Wet-chemical extinguishers are used for special applications, such as ____ fires.
Class K
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something that a firefighter would do in inspecting a portable fire extinguisher?
check to see when it was last used
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The rating for a Class B extinguisher assumes that the operator will be ____.
untrained
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