Fire Extinguishers

Class K extinguishers are designed to fight cooking fat, oil, and grease fires, such as deep fryers. The chemicals inside these extinguishers react with the grease to form a foamy layer that will not burn.

Depends on the exact type of extinguisher. For most, remember PASS. Pull safety pin, Aim at bottom of fire, Squeeze handles together hard, and Sweep the fire out with the stream from the extinguisher.

First you need to look at the fire triangle. In the fire triangle (consisting of heat, fuel, air) the firefighter removes one of the sides of the triangle, thus extinguishing the fire. There is also the fire tetrahedron which has the addition of a chemical chain reaction. The most common way to put out a fire is with water. This cools the fire and then also helps to remove the air with the expansion of the water into steam. Some departments use a wetting agent, or foam, added to the water. This helps to remove the fuel and air from the equation. Lastly, depending on the fire, a chemical is used that helps to disrupt the amount of air the fire has to burn and smothers it. This could be a dry chemical from and extinguisher or even a gas from a CO2 extinguisher.

It depends on the quantity. If you have a great load, yes. If you have a little, no. Some Class D "dry powder" extinguishers use salt (NaCl) as one component.

USCG regulations do not require any B-II extinguishers on pleasure vessels up to 65 feet or 1,000 bhp, unless it is a passenger-carrying motor vessel.

However, where two or more B-I extinguishers are required, a B-II may be substituted for two B-Is, although it is a very bad idea to increase the risk that one extinguisher may malfunction and you would not have any backup.

Canadian regulations are somewhat different and require at least one B-II for any motor vessel over 8 meters or any other vessel that large, if there is a gas or liquid-fueled heating or cooking system aboard.

Fire safety - check with a Fire Authority.

Also, the types of extinguishers and their chemicals vary from country to country, maybe even state to state.

Are you talking about general flammables, or flammables in the presence of electricity, for example?

Big differerence: the wrong extinguisher may kill you.

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If you mean "portable fire extinguisher" they cannot be more than 40 pounds and the average is closer to 10 or less.

It depends upon the type of chemical that is burning, but frequently it is safe to use a dry-chemical powder (DCP), or an ABC type of extinguisher.

However, boiling grease fires may need a Class K extinguisher and flammable metals (aluminum, magnesium, lithium, etc) may need a Class D extinguisher.

type B

There are a few different types of dry powder. The most common one, suitable for class A, B, C and electrical fires ((A=Solids, B=Liquids, C=Flammable Gases) and found in most household units, contains monammonium phosphate. This decomposes in a flame and produces free radicals (unpaired electrons) which interrupt the combustion process. Additionally, the chemical melts and forms an insulating "skin" on burning solids, smothering the flames. (Note - the fire clases above are for UK regulations; in North America the fire classification is: A=ordinary combustibles, B=flammable and combustible liquids and gases, C=energized electrical equipment/appliances).

Units using sodium bicarbonate are not used on class A fires, but are particularly effective on liqud (class B) fires. Potassium carbonate (purple K) is sometimes used as an alternative.

For motor racing, where rapid fire knockdown is needed, Monnex (combining a bicarbonate powder with urea) is used; this has superb quenching power for liquid fuel fires.

Finally, there are specialsit powders available for dealing with burning metals, which react with all other extinguishing agents and powders. These contain powdered sodium chloride, powdered graphite or powdered copper metal.

While there are "disposable" extinguishers of the use once and throw away variety most are refillable and if maintained can be used repeatedly for up to 30 years or more. This can result in a cost savings over time.

the type that spray foam

Must be Coast Guard approved

Yes, a fire extinguisher works on a grease fire. What you have to avoid with grease fires is throwing water on them, because the burning grease will just float on the water and will be splashed around as the water heats and vaporizes, spreading the fire, rather than being put out. But the carbon dioxide based fire extinguisher doesn't have that problem.

Mostly because it's pointless. The bottle can only be filled up with specialized equipment, and they have a gauge to tell them how much is in it. Once the extinguisher is used, it has to be returned anyway to be refilled regardless how much CO2 you may have used. If you happen to be using it when it runs out, well, the fire is out of control already.

throwing a blanket over a small contained fire stops oxygen to the fire .to stop a fire you need to take out one of the three elements that are needed for a fire to burn witch are heat /oxygen/fuel

Someone initially said: 1500ft.

State and local fire codes may have different criteria based upon the type of occupancy and the level of hazard.

For example, in an ordinary Class A hazard (paper, plastic, wood, cloth), you may need a Class 2-A or 4-A fire extinguisher within 75 feet of travel distance from any interior location, or one for every 11,250 square feet. For Class B hazards, a 5-B may be required within 30 feet for low hazards and a 50-B may be required within 50 feet of a high hazard, among many other possible combinations.

NFPA 1 (2009) Fire Code: 13.6.8.2, 13.6.8.3.

US Coast Guard regulations prescribe the minimum number and size of fire extinguishers, if any, required aboard various vessels.

In a commercial kitchen, a Class K extinguisher may be required within 30 feet.

NFPA 1 (2009): 13.6.8.6

Your local codes may vary.

It can cool lava somewhat, but so does air or anything else that is at a lower temperature than the lava. It would not cool lava enough to make noticeable difference.

The owner of a commercial occupancy is required to inspect fire extinguishers monthly and to keep written records. These duties may be delegated to the Facility Manager, but the owner remains responsible.

During any annual inspection by the local fire inspectors, the inspector may examine a few extinguishers, but will be primarily interested in seeing the records of the monthly inspections and notations of when each extinguisher is due for maintenance, testing or replacement.

Two

Evidence for the use of fire by Homo erectus by about 400,000 years ago has wide scholarly support. Claims for the earliest definitive evidence of control of fire by a member of Homo range from 0.2 to 1.7 million years ago (mya).

Since petroleum is a flammable liquid, a Class B fire extinguisher would be used.

The B determines the type of fire that can be extinguished, and in this case it would be flammable liquids such as gasoline, grease, oil, diesel fuel, and kerosene.

The number indicates the approximate number of square feet the unit can extinguish, so a B-1 would be a relatively small extinguisher.