Why is helium not used in fire extinguishers? Helium would rise and allow the fire to keep burning. To put out the fire, you need to smother it so as to prevent Oxygen getting to it.
If the fire extinguisher is not pressurized enough, there will not be enough pressure to effectively fight the fire. While fire extinguishers do vary by design, by and large, all of them would have some form of pressure gauge such as the one below. If the needle is in the green zone, you are good to try to put out the fire.
Why nitrogen is used in fire extinguisher? – Fire safety
Its primary use has been as a pressurization gas in total-flood fire suppression systems and in portable fire extinguishers. Why nitrogen is not used in fire extinguisher? The extinguishing effect of inert gases such as argon, nitrogen and carbon dioxide (in principle, this is not an inert gas and is therefore unsuitable for class D fires) is achieved through the displacement of atmospheric …
We are aware of hangar-flying sessions in which pilots have said they wouldn’t use a fire extinguisher in the cabin because the gases it expels are worse than the fire. That’s absolutely untrue. While we don’t recommend a dry chemical extinguisher, in an emergency using one is safer than letting a fire burn.
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Are chemical fire extinguishers safe to use in aircraft?
Second, a dry chemical extinguisher—the most common type we see in aircraft—uses chemicals that have effects on the occupants and the aircraft that are so pernicious that we recommend against their use in aircraft. We’ll tell you why we came to those conclusions.
What happens if a fire extinguisher is not pressurized enough?
If the fire extinguisher is not pressurized enough, there will not be enough pressure to effectively fight the fire. While fire extinguishers do vary by design, by and large, all of them would have some form of pressure gauge such as the one below. If the needle is in the green zone, you are good to try to put out the fire.
What is the most effective fire extinguishing agent?
The most effective extinguishing agent for Class A, B and C fires, bar none, is Halon—which the FAA describes as one of the class of halocarbon chemicals. It, and newer Halon alternatives, are considered clean agents because they pose little risk to humans in the area when discharged.
Are there Halon alternatives to fire extinguishers?
We spoke with Chris Dieter, senior vice president of H3R Aviation, the major player in the aviation fire extinguisher world, who told us that there has been a great deal of research into finding a Halon replacement—and Halon is gradually becoming harder to get. The most common of the Halon alternatives is Halotron.
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Don't throw out that old fire extinguisher Video Answer
Reference:
https://www.usfa.fema.gov/
https://en.wikipedia.org/wiki/Fire_extinguisher