Defining a fire as small that necessitates the use of a fire extinguisher is....
NOT a clear cut decision
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
pressurized extinguishers use a to propel the agent out of the container
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
- Pull pin
- Aim nozzle
- Squeeze handle
- Sweep the base of the fire
pressure test to ensure unit will not explode when operated. Testing period ranges form 5 to 12 years.
The must be taken into account when selecting a fire extinguisher.
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.
When choosing the size of extinguisher.....
best to choose the larger one
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
First factor to consider when choosing an extinguisher?
The type and amount of fuel present
loaded stream extinguisher
agent added to water, can combat freezing problem with an alkali salt as an antifreeze agent
A 1-A rated extinguisher should....
extinguish about 1 cubic foot of wood cribbing
pressurized water or foam extinguisher should reach...
about 20 feet
stored pressure extinguishers were designed to be....
a method of electronic communication between an in-place extinguisher and an electronic monitoring device/system
FF inspection of extinguisher is usually...
Alkali salts can be used to...
prevent water from freezing
Alcohol Resistant foam- foam containg polymer that forms protective layer between burning surface and foam. prevents breakdown
Most extinguishers have a....
Pump tank extinguishers utilize...
AFFF & FFFP extinguishers with air-aspirating nozzles have....
an anti-overfill tube
What does the number rating of extinguishers mean?
ratings increase as the amount of fire suppressed increeases
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
When confronted with a dog use what extinguisher?
CO2 carbon dioxide
Where are pressurized water extinguishers usually recharged?
How many gallons do most portable water extinguisher contain?
How often should extinguishers in buildings be checked?
every 30 days or electronically monitored
Who sets requirements of size,type,and location of extinguishers?
Fire Prevention Bureau
Many facilities that have Class D fuels have...
QRT Quick response team
All halon production has been banned by...
Montreal Protocol on Substances that Deplete the Ozone Layer
signs for fire classes
- A- green triangle
- B- red square
- C- blue circle
- D- yellow star
- K- black stop sign
Clean agents are....
gases that do not conduct electricity or leave residue
Testing of extinguishers is usually conducted by...
Underwriters laboratories, factory mutual research corporation, or coast guard
soda acid, chemical foam, carbon tetrachloride, cartridge, copper or brass
Dry powder and dry chemical agents (can/cannot) be used interchangably.
extinguishers in use today require inverting prior to use.
___ is the basic extinguishing agent for Class A materials.
Wet-chemical extinguishers are used for special applications, such as ____ fires.
something that a firefighter would do in inspecting a portable fire extinguisher?
check to see when it was last used
The rating for a Class B extinguisher assumes that the operator will be ____.