Extinguishers Flashcards
Many fire extinguishers use up there supply in
8-10 seconds
Typical expelling gas used in extinguishers is
Nitrogen
Six methods of expulsion are
- self generating
- self expelling (co2)
- Gas cartridge or cylinder (nitrogen)
- stored pressure (common)
- mechanically pumped (water)
- Hand Propelled
Acronym for fire extinguishers
P - pull pin
A - aim at base of fire
S - squeeze discharge lever
S - sweep rapidly back and forth
When inspected, how is internal fullness checked
Weighing or hefting
Extinguishers are inspected
Monthly
Class A shape and colour
Green Triangle
Class B shape and colour
Red Square
Class C shape and colour
Blue circle
Class D shape and colour
Yellow star
Class K shape and colour
Black hexagon
Class A hazard
Ordinary combustible (wood, paper, fabric)
Class B hazard
Flammable Fuels
Class C hazard
Energized electrical
Class D hazard
Combustible metals
(Magnesium, Titanium, Zirconium, Sodium, Potassium)
Class K hazard
Cooking materials
Dry Chemical extinguisher is used on which class of fire
B & C
Multi-Purpose Dry chem is used on what fires
A, B & C
What’s the difference between dry chem and multi purpose dry chem
Multi-Purpose has ammonium phosphate in it
2 basic styles of Dry chem extinguishers is
Stored pressure
Cartridge operated
Wet chemical extinguishers can be used with what classes of fires
Class A & K
Wet chemical extinguishers using a base agent of
Aqueous solution of organic salts that form an extinguishing agent
Dry powder is used to extinguish what class of fires
Class D
How does dry powder prevent re ignition
Forming hard crust on metal
dry chem discharge range
6-8ft
Water extinguisher has a range of
35-40ft
Foam extinguisher has a range of
25-30ft
Water approx. discharge time
55 seconds
Water extinguisher most common size
2.5 gal
Water mist contains what and is used where
-De-ionized water
-used where unregulated amounts of water used could cause excessive damage (museum, library)
Halon isn’t used in regular circumstances anymore because
It causes damage to the ozone layer
Halon was used on
Class B or C fires
2 most common types of halon are
1211 and 1301
CO2 extinguishers should be discharged from horn at
45 degree angle
CO2 is not to be used on
Pressurized Fuel
CO2 extinguishers are to be used on what classes
Class B & C
CO2 discharge method
Self expelling (due to its high pressure at room temp)
CO2 max discharge range
3ft to 8ft
What year did all inverting types of extinguishers stop being manufactured
1969
Types of inverting extinguishers
Soda acid
Foam
Cartridge operated water and
Loaded stream type
Two basic types of water extinguishers are
Stored pressure
Pumped pressure
What kind of acid in “soda acid extinguisher”
Sulfuric acid
Soda acid extinguisher has what added into the water
Sodium bicarbonate
Nozzle on foam extinguisher is
Air aspirating
CO2 is stored in a heavy shell at pressures up too
800-900psi
Dry chem come in sizes
5-30lbs
Signs on extinguishers shall indicate
Purpose
Content
Usage
Markings on extinguishers shall be legible from
3 feet
Markings on wall panels shall be legible from
15 feet
Hydrostatic test every
5 OR 12 years (depends on discharge method)
Extinguisher under 40Lbs mounting height
No more then 5ft
Extinguisher over 40Lbs
3 1/2’ max from floor
Never shall an extinguisher be located less then ____ off the floor
4”
Max distance between extinguishers is
75ft
Minimum “A” rating light hazard
2-A
Minimum “A” rating ordinary hazard
2-A
Minimum “A” rating extra hazard
4-A
Minimum floor area per unit of “A”light hazard
3000sqft
Minimum floor area per unit of “A” ordinary hazard
1500sqft
Minimum floor area per unit of “A” extra hazard
1000sqft
Maximum floor area per unit extinguisher
11, 250sqft
Water extinguishers interrupt the fire triangle by
Removing heat
Foam extinguishers interrupt the fire triangle by
Separate the oxygen
Carbon dioxide extinguishers interrupt the fire triangle by
Takes away oxygen, and removes heat with very cold discharge
Dry Chem extinguishers interrupt the fire triangle by
Creates a barrier between oxygen and the fuel
Wet chem extinguishers interrupt the fire triangle by
Barrier between oxygen and fuel
Dry powder extinguishers interrupt the fire triangle by
Separating the fuel from oxygen, and removing heat
