Chapter 6 Fire extinguishers Flashcards
What class of extinguisher is known as the all-purpose extinguisher?
Class A
Class K is for what kind of fire?
Kitchen
Class D extinguishers are for….
Combustible objects: magnesium, potassium etc…
Class C extinguishers are for…
Electrical fires
Class B extinguishers are for..
Flammable liquids
What could be used as an extinguishing agent for class B?
CO2
Dry chemicals
Class B foam
Class A extinguishers are for..
Ordinary combustibles
True or false?
Water and water-based agents are a good option for class C fires
FALSEEE
Dry powder works best for class D fires?
Falseeeee
What is the process that turns fats and oils into a soapy film?
Saponification
What are the 4 different processes that happen with the different types of extinguishers?
Smothering
Cooling
Chemical flame inhibition
Saponification
The AFFF extinguishers (Aqueous film forming foam) are suitable and not suitable for which class of fires?
Intended : Class B
Non-suitable: Class C, D, K
In which case would halogenated extinguishers be used?
When the extinguished material would be damaged by water or chemicals
Wheeled extinguisher units are good for what kind of fires?
Class A,B,C
Dry powder extinguishers are for… and that class represents what kind of fire
Class D fires for chemical fires
During a visual inspection of an extinguisher, what 4 checks should you make?
Condition
Hose-Nozzle
Weight
Pressure
What acronym and steps do you use for application method of an extinguisher?
PASS
P- Pull the pin
A- Aim the nozzle at the bas
S- Squeezer the handle (rapid test and then application)
S- Sweep nozzle back and forth
How to select the right extinguisher? There are 8 factors you should consider, try to name as many as you can
-Classification of fuel burning
-Hazards to be protected against
-Atmospheric conditions
-Ease of handling
-Rating of extinguisher
-Size and intensity of fire
-Any life hazard or operational concern
-Availability of trained personnel
For a class C fire, what should you do before extinguishing?
Turning off the electrical source
What is the primary extinguishing when using water?
Cooling
What is the primary method of extinguishment when using dry chemicals?
Chain inhibition
When smothering happens, what is excluded from the burning process?
Oxygen
What does the AFFF acronym stand for and what class of fire is it meant for?
AFFF : Aqueous film forming foam
Use: Class B fires
What is the main chemical in purple K extinguishers?
Potassium bicarbonate
What is another name for clean agent extinguishers?
Halogenated extinguishers
