Discussion 3 Flashcards
(26 cards)
A portable device used to put out fires of limited size. It is a mechanical device usually made of metal, containing chemicals, fluids or gases for stopping fires, the means for application of its contents for the purpose of putting out fire before it propagates, and is capable of being readily moved from place to place.
FIRE EXTINGUISHERS
CLASSES OF FIRE EXTINGUISHER are?
Portable fix extinguisher
Semi portable wheeled type
- designed to use for immediately controlling workplace fires.
- Portable - Fire Extinguisher
- designed to provide a way of getting a sizeable amount of extinguishing agent to a fire rapidly.
- Semi - Portable/ Wheeled Type
Steps in using Portable Fire Extinguisher:
- Pull the pin at the top of extinguisher.
- Aim or point the nozzle or outlet toward the base of the fire.
- Squeeze the handle above the carrying handle to discharge them agent. To stop the discharge, release the hand.
- Sweep the nozzle in side to side motion before the flames to spread the extinguishing agent. Direct the agent at the base of the flames
The most common Extinguishing Agents Used:
- WATER
- DRY CHEMICALS
- CARBON DIOXIDE
- AFFF/FOAM
- HALLONS
- METAL/SAND EXTINGUISHER (dry powder)
used only in class A. These extinguishers contain water and compressed gas and should only be used on class A fires. Water is the most effective in cooling the burning material below its ignition temperature.
- WATER
Extinguishers are usually rated for multi-purpose use. It contains an extinguishing agent and uses a compressed non-flammable gas as a propeliant.
Dry Chemical
Used on class B and class C fires. CO2 extinguishes fire by smothering, reducing the oxygen level below that which supports combustion.
- CARBON DIOXIDE
Used only on class A and B fires. Foam removes fuel by forming a layer over a burning liquid and preventing flammable vapours from escaping.
- AFFF/FOAM
Used on class B and C fires. These liquefied gases are most effective in interrupting the chain reaction, but they also have slight smothering and cooling effects. These types of extinguishers are often used to protect valuable electrical equipment since they leave no residue to clean up.
- HALONS
These types of extinguishers are primarily used for flammable metals. It generally extinguishes fires by excluding air from the combustible materials.
- METAL/SAND EXTINGUISHERS (Dry Powder)
Types of Extinguisher Testing are?
- Hydrostatic Test
- Service Test
- an internal pressure check of an extinguisher or shell to detect
possible failure under pressure.
- Hydrostatic Test
-the operational testing of an extinguisher conducted yearly to determine its functions to operate properly.
- Service Test
The proper selection of an agent or method of control or extinguishment is the most important factor in determining the degree of a success of a firefighting operation.
FIRE SUPPRESSION, CONTROL AND EXTINGUISHMENT, AND EXTINGUISHING AGENTS
- means slowing down the rate of burning.
FIRE SUPPRESSION
-means keeping the fire from spreading or holding the fire to one area.
CONTROL
- is putting the fire completely out.
EXTINGUISHMENT
The effectiveness of an extinguisher on a particular depends on the amount or type of agent in the extinguisher. Different extinguishing agents can be used to put out a certain class of fire by one or more methods.
EXTINGUISHING AGENTS
EXTINGUISHING AGENTS ARE?
- Removing Oxygen;
- Removing the fuel;
- Removing Heat; and
- Interrupting the chemical chain reaction.
METHODS OF EXTINGUISHMENT ARE?
- Cooling
- Separation
- Smothering
- Inhibition or the interruption
ADDITIONAL BASIC TACTICS USED IN EXTINGYUISHING FIRE ARE?
- RESCUE
- OVERHAUL
- SALVAGE
- any action taken by the firefighters to remove occupants/person from building/hzards to a safety place.
- RESCUE
