They work much like an aerosol can. When you depress a lever, a propellant expels the material inside under high pressure. When using a fire extinguisher, you should always direct the spray of water, foam, or powder toward the fuel source, not the flames.
How does a fire extinguisher valve work?
A release valve keeps the compressed gas from escaping. To use the extinguisher, you pull out the safety pin and depress the operating lever. … The compressed gas escapes, applying downward pressure on the fire-suppressant material. This drives the material up the siphon and out the nozzle with considerable force.
What is the operating lever on a fire extinguisher?
Operating lever: the lever is the metal piece that can be pressed or squeezed to operate the extinguisher. However, the operating lever will not be able to be pressed/squeezed unless the pull pin has first been removed.
How do fire extinguishers work step by step?
The acronym PASS is used to describe these four basic steps.
- Pull (Pin) Pull pin at the top of the extinguisher, breaking the seal. …
- Aim. Approach the fire standing at a safe distance. …
- Squeeze. Squeeze the handles together to discharge the extinguishing agent inside. …
How does a fire extinguisher work class 10?
Soda acid type extinguisher acts by cutting off supply of air. It acts on all types of fire except due to electrical and inflammable liquids. The carbon dioxide is liberated by the action of acid on baking soda. It increases the percentage of carbon dioxide in air (CO2 is non supporter of combustion).
Why do you sweep the fire extinguisher from side to side?
Swipe from side to side to cover all areas the fire may have spread to. Before operating a fire extinguisher fire extinguisher, you must take some safety precautions. … If the fire is small enough and can easily be put out and contained, continue to use the P.A.S.S. technique to put it out.
How do most fire extinguishers indicate what type of fire on which they can be used?
Most fire extinguishers will have a pictograph label telling you which classifications of fire the extinguisher is designed to fight. For example, a simple water extinguisher might have a label like the one below, indicating that it should only be used on Class A fires. Solid combustible materials that are not metals.
How does a fire extinguisher work class 8?
The job of a fire extinguisher is to cut off the supply of air or bring down the temperature of the fuel. Fig. 9 Follow PASS. Soda – acid fire extinguisher: Carbon dioxide liberated by the reaction of sulphuric acid with sodium bicarbonate solution comes out with a stream of liquid water at high pressure.
What sequence of steps should you follow when using a fire extinguisher?
A: Aim the extinguisher nozzle on the hose low, toward the base of the fire. S: Squeeze the handle or lever to discharge the extinguisher. S: Sweep the nozzle back and forth. Keep the fire extinguisher aimed at the base of the fire and move it from side to side until the flames are extinguished.
How do you use a fire extinguisher explain pass method with the help of diagram?
When operating a fire extinguisher, remember the word PASS:
- Pull the pin. Hold the extinguisher with the nozzle pointing away from you and release the locking mechanism.
- Aim low. Point the extinguisher at the base of the fire.
- Squeeze the lever slowly and evenly.
- Sweep the nozzle from side-to-side.
How do you lift a fire extinguisher?
Properly using a fire extinguisher in the workplace
- Pull the pin on the extinguisher.
- Aim the hose nozzle low toward the base of the fire.
- Squeeze the handle to release the extinguishing agent.
- Sweep the nozzle from side to side at the base of the flames until extinguished.
Why is baking soda used in fire extinguisher?
When sodium bicarbonate (baking soda) is heated, it becomes sodium carbonate. In this process water and carbon dioxide is released. The CO2 starves the fire of O2. … These react to release CO2 which forms a layer over the burning substance and cuts the supply of oxygen to the fire.
What is a 10B fire extinguisher?
For each B, the extinguisher can stop one square foot of Class B fires. A 10B extinguisher can stop 10 square feet of Class B fire, a 20B extinguisher can stop 20 square feet, and so on.
Which gas is used in fire extinguisher?
Carbon dioxide (CO2) is stored in extinguishers in the liquid phase. It vaporizes when released thereby smothering a fire by excluding the air (oxygen) needed for combustion.