Extinguishers made of water Water extinguishers are one of the most cost-effective ways to put out Class A fires, which are ones that are started by solid materials like paper, wood, or textiles. Water extinguishers come in four varieties: water jet, water spray, water with additives, and water mist or fog. Water jet extinguishers cool the burning materials and prevent re-ignition by shooting a jet of water at them. They are not to be utilised near live electrical equipment. Water spray extinguishers use an extremely fine mist of water droplets that are surrounded by non-conductive air.
Most water spray fire extinguishers have passed a 35 kV dielectric test, which implies they were tested at one metre with a 35,000 volt electrical source. Water extinguishers with additives are those that have foaming chemicals added to them. The water loses its natural surface tension, making it easier for it to seep into the burning materials. Because the chemicals are mixed into the water, a smaller extinguisher can achieve the same fire rating as a larger extinguisher that uses only water. Extinguishers that use water mist, or fog, apply water in the form of mist, or fog, with much smaller droplets than a water spray extinguisher.
The smaller the droplet, the larger its surface area in relation to its size, the faster it evaporates, absorbing heat energy more quickly. The disadvantage is that the smaller the droplet, the less it weights, and hence the weaker the water cloud. A red label can be found on all water extinguishers. Extinguishers made of foam On Class A and B fires, foam fire extinguishers can be used. They're best for putting out liquid fires like gasoline or diesel, but they're more versatile than water jet extinguishers because they can also put out solid fires like wood and paper.
Liquid fires are extinguished by foam by sealing the liquid's surface, preventing flammable vapour from reaching the air and starving the fire of fuel. They should not be used on free-flowing liquid fires. The label on foam extinguishers is cream. Extinguishers with powder Powder extinguishers are a versatile fire extinguisher that may be used to put out Class A, B, and C flames. They can also be used to put out flames caused by electrical equipment, but they do not cool the fire down enough for it to re-ignite.
Powder extinguishers can also reduce visibility and cause breathing difficulties. They are normally not suggested for usage inside buildings unless there is no other option. A blue label can be found on powder extinguishers. CO2 extinguishers are perfect for areas with a lot of electrical equipment, such as offices or server rooms, because they are safe to use on fires involving electrical apparatus. Unlike foam extinguishers, carbon dioxide extinguishers do not leave any residue. They can also be used to put out Class B fires, which are ones that involve flammable substances like paraffin or gasoline.
CO2 extinguishers put out fires by suffocating them and cutting off their oxygen supply. The CO2 (Carbon Dioxide Extinguisher) has a black label. Chemical extinguishers for wet fires Class F fires containing cooking oils and fats, such as lard, olive oil, sunflower oil, maize oil, and butter, can be put out with wet chemical extinguishers. When used correctly, they are incredibly effective. The wet chemical quickly extinguishes the flames, cools the burning oil, and reacts chemically to generate a soap-like solution that seals the surface and prevents re-ignition.
Although they are primarily intended for use on Class F fires, cooking oils, and deep fat fryers, they can also be used on other types of fires. They can also be used on Class A and Class B flames (wood, paper, and fabrics) (flammable liquids). The label on wet chemical extinguishers is yellow. Blankets for the fire Fire blankets are designed to be used on hot oil fires, such as those found in frying pans or tiny deep fat fryers. They can also be used to put out a fire in someone's clothing. They function by suffocating the fire, cutting off the oxygen supply that fuels it, and finally extinguishing it.
Extinguishers are made to put out various types of fires. There are six main types of fires, as well as a variety of fire extinguishers.
Classes of fire:
- Fires involving solid materials such as wood, paper, or textiles are classified as Class A.
- Fires containing combustible liquids such as gasoline, fuel, or lubricants are classified as Class B.
- Fires involving gases are classified as Class C.
- Metal-related fires are classified as Class D.
- Fires involving live electrical apparatus are classified as Class E. (Technically, the term "Class E" does not exist; however, it is used here for convenience.)
- Fires containing cooking oils, such as those found in deep-fat fryers, are classified as Class F.