How does fire extinguisher kills or fights fire?
what is the composition of fire extinguisher?
what is the alternative ingredient in fire extinguisher kills fire?
..tnx again!
Answer:
Most fire extinguishers today are filled with monoamonium phosphate (ABC Dry Checmical) and nitrogen to pressurize the unit.
As others have pointed out, there are a variety of other agents used, including but not limted to: Water, Halongenated Agents, Foams, Purple-K, Potassium/Salt solutions, sodium bicarbonate (baking soda), and carbon dioxide.
Like superwatermelon pointed out, the agents all contain/extinsuish the fire by removing one of the elements of the "Fire Tetrahedron" which is the chemical reaction of Oxygen, Heat, and Fuel.
http://en.wikipedia.org/wiki/fire_triang...
Some remove one or more of those three elements, some agents, like halogenated units, attack the chemical process itself.
To learn more about the different types of fire, fire-extinguishers, agents, and proper use, visit the following sites...
http://www.fireextinguisher.com...
http://home.howstuffworks.com/fire-extin...
There are several different kinds of fire extinguishers. The main ingredient in the extinguisher you might find in a building or your home is filled with CO2 or carbon dioxide. Every time you exhale you omit CO2 as a bi-product of oxygen.
There is a basic principal to fire called a tetrahedron. Basically you have 3 main components of fire. Fuel, heat and oxygen. By displacing the oxygen with CO2 you now are left with only 2 components. This makes it impossible for fire to exist.
Now in the atmosphere we breath a mixture of approximately 79% Nitrogen and 21% Oxygen the rest are inert gases like neon that are just floating about. So that's how oxygen gets in the fire. I am sure you remember "Stop, drop and roll" The concept here was to smother the fire.
A type of fuel can be anything like wood or paper.
Heat can be created from friction. If you're really good at creating fires you can do it with stones. Rubbing or hitting the stones causes friction and heat which in turn create a spark. The continuous burning keeps the fire hot!
So CO2 is the chemical that kills fires. But remember there are several different types of fire extinguishers. Just like there are several different types of fires. For example if you were fighting a grease fire you wouldn't use water.
Another extinguisher is something call A triple F or Aqueous Film Forming Foam. This is pretty cool stuff. You can use it on oil and gasoline fires it works the same way CO2 does by smothering the fire.
The fire extinguisher is comprised of a tank, an accelerator the propellant that's in the tank a pull pin and a discharge lever.
The alternative ingredient would be things like A-FFF or water, sand etc.
One last note you have 3 classifications of fire.
A -Wood, cloth or paper
B -Gasoline, oil
C -Wires or circuit breakers
I hope that helps.
I *think* an average ABC extinguisher uses CO2 (Carbon Dioxide) to kill the fire. It works on 2 levels: 1) it's very cold; remove the heat, kill the fire. 2) it helps block oxygen from getting to the fire; no O2, no fire.
A fire extinguisher is an active fire protection device used to extinguish or control small fires, often in emergency situations.
There are three essential elements involved in this process:
Extreme heat
Oxygen (or similar gas)
Fuel
Fire extinguishers are designed to remove at least one of these elements so that a fire will die out. There are several different ways of doing this.
There are basically four different types or classes of fire extinguishers, each of which extinguishes specific types of fire. Newer fire extinguishers use a picture/labeling system to designate which types of fires they are to be used on. Older fire extinguishers are labeled with colored geometrical shapes with letter designations. Both of these types of labels are shown below with the description of the different classes of extinguishers.
Additionally, Class A and Class B fire extinguishers have a numerical rating which is based on tests conducted by Underwriter’s Laboratories that are designed to determine the extinguishing potential for each size and type of extinguisher. Click on any of the topics listed below for additional information that may be helpful to know.
Dry Chemical extinguishers are usually rated for multiple purpose use. They contain an extinguishing agent and use a compressed, non-flammable gas as a propellant.
Halon extinguishers contain a gas that interrupts the chemical reaction that takes place when fuels burn. These types of extinguishers are often used to protect valuable electrical equipment since them leave no residue to clean up. Halon extinguishers have a limited range, usually 4 to 6 feet. The initial application of Halon should be made at the base of the fire, even after the flames have been extinguished.
Water These extinguishers contain water and compressed gas and should only be used on Class A (ordinary combustibles) fires.
Carbon Dioxide (CO2) extinguishers are most effective on Class B and C (liquids and electrical) fires. Since the gas disperses quickly, these extinguishers are only effective from 3 to 8 feet. The carbon dioxide is stored as a compressed liquid in the extinguisher; as it expands, it cools the surrounding air. The cooling will often cause ice to form around the “horn” where the gas is expelled from the extinguisher. Since the fire could re-ignite, continue to apply the agent even after the fire appears to be out...
Fire Extinguisher :
Dry Chemical:
Ammonium phosphate, used on class A, B, and C fires. It receives its class A rating from the agent's ability to melt and flow at 350 degrees to smother the fire. More corrosive than other dry chemical agents. ABC Dry Chemical
Sodium bicarbonate, used on class B and C fires. Interrupts the fire's chemical reaction.
Potassium bicarbonate (aka Purple-K), used on class B and C fires. About two times as effective on class B fires as sodium bicarbonate. The preferred dry chemical agent of the oil and gas industry. The only dry chemical agent certified for use in AR-FF by the NFPA.
Foams:
AFFF (aqueous film forming foam), used on A and B fires and for vapor suppression.
AR-AFFF (Alcohol-resistant aqueous film forming foams), used on fuel fires containing alcohol. Forms a membrane between the fuel and the foam preventing the alcohol from breaking down the foam blanket.
FFFP (film forming fluoroprotein) contains naturally occurring proteins to create a foam blanket that is more heat resistant then the synthetic AFFF foams.
CAFS (compressed air foam system) Any APW style extinguisher that is charged with a foam solution and pressurized with compressed air. Generally used to extend a water supply in wildland operations. Used on class A fires and with very dry foam on class B for vapor suppression.
Arctic Fire is a liquid fire extinguishing agent that emulsifies and cools heated materials quicker than water or ordinary foam. It is used extensively in the steel industry. Effective on classes A, B, and D.
FireAde, a foaming agent that emulsifies burning liquids and renders them non-flammable. It is able to cool heated material and surfaces similar to CAFS. Used on A and B (said to be effective on some class D hazards).
Wet Chemical (potassium acetate) extinguishes the fire by forming a crust over the burning oil. Generally class A and K only.
Water:
APW (Air pressurized water) cools burning material by absorbing heat from burning material. Effective on only Class A fires, but has the advantage of being cheap, harmless, and relatively easy to clean up.
Water Mist uses a misting nozzle to break up a stream of distilled water to the point of not conducting electricity back to the operator. Class A and C rated.
Clean Agents:
Halon, a gaseous agent that disrupts the chemical reaction of the fire. Classes A,B, and C. Banned from new production; replaced by Halotron or FE-36.
CO2, a gaseous agent that smothers the fire. Classes A,B and C.
Mixtures of inert gases, including Inergen and Argonite.
Class D:
Sodium Chloride and Copper forms a crust over the burning metal and performs like a heat sink to draw heat away from the burning material, also smothers to a degree. Class D Fire Extinguisher
The answers post by the user, for information only, FunQA.com does not guarantee the right.
More Questions and Answers: