Dry chemical fire extinguishers extinguish the fire primarily by interrupting the chemical reaction of the fire triangle. The most widely used type of fire extinguisher is the multipurpose dry chemical that is effective on Class A, B, and C fires.
How are fire extinguishers used to stop a fire?
Carbon Dioxide (CO2) Extinguishers
CO2 extinguishers are mainly used for electrical fire risks and are usually the main fire extinguisher type provided in computer server rooms. They also put out Class B fires. CO2 extinguishers suffocate fires by displacing the oxygen the fire needs to burn.
How does a fire extinguisher quench the flame?
In a carbon dioxide extinguisher, the carbon dioxide is kept in pressurized liquid form in the cylinder. When the container is opened, the carbon dioxide expands to form a gas in the atmosphere. Carbon dioxide gas is heavier than oxygen, so it displaces the oxygen surrounding the burning fuel.
What are the 4 steps in using a fire extinguisher?
For an easy-to-remember 4-step process to operating a fire extinguisher, learn the PASS system:
- Pull the pin while holding the extinguisher away from you to unlock the mechanism.
- Aim low toward the base of the fire.
- Squeeze the lever slowly.
- Sweep the nozzle from side to side at the base of the fire.
What can put out a fire?
CORRECT WAYS TO PUT OUT AN ELECTRICAL FIRE
- Use a fire extinguisher. You should use a multipurpose fire extinguisher with C in its label. …
- Use baking soda. Is there anything baking soda can’t fix? …
- Use a heavy blanket. Without oxygen, the fire can’t burn.
Do fire extinguishers expire?
Even if there’s no expiration date, it won’t last forever. Manufacturers say most extinguishers should work for 5 to 15 years, but you might not know if you got yours three years ago or 13. … If it falls anywhere else, the extinguisher is unreliable and should be serviced or replaced.
When should you use a fire extinguisher?
When do you use a fire extinguisher?
- After the fire alarm has been raised and the building/area evacuation has commenced.
- The fire is not between you and your escape route.
- The fire is in its very early stages, small in size, contained, and only requires one fire extinguisher.
What is the main cause of death in fire?
The characteristic biphasic distribution of carboxyhemoglobin in fire victims together with other observations suggest that the principal causes of death are carbon monoxide followed by carbon dioxide poisoning and/or oxygen deficiency, while the influence of heat is considered to be of minor importance.
What is the best defense against fire?
As always, the best defense against a fire is to be prepared. Take a moment to look at your fire extinguisher.
What is the first thing to do in a fire?
Activate the first fire alarm you see and try to help others to evacuate the building. Close doors behind you to help prevent the fire from spreading. Follow the evacuation procedure if you’re at your workplace or follow the escape route signs if you’re a visitor. Listen to instructions given by the Fire Marshal.
Which procedure is first when using a fire extinguisher?
Approach the fire standing at a safe distance. Aim the nozzle or outlet towards the base of the fire. Squeeze the handles together to discharge the extinguishing agent inside. To stop discharge, release the handles.