Classes of fire and their extinguishers pdf
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- Classes of Fires & Fire Extinguishers
- Fire extinguishers
- The 6 Types And Classes Of Fire And How To Attack Them
There are four classes of fires: Class A : Ordinary solid combustibles such as paper, wood, cloth and some plastics. Class B : Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering. Class C : Electrical equipment, appliances and wiring in which the use or a nonconductive extinguishing agent prevents injury from electrical shock.
Classes of Fires & Fire Extinguishers
Everyone knows that their workplace is required to have fire extinguisher s , and everyone should know where the nearest one is. However, most do not realize that a single fire extinguisher does not work on all types of fire. There are many different types, or classes, of fire extinguishers just as there are many different classes of fire.
To achieve true safety for your place of work, you need to ensure that you have the proper extinguisher installed relevant for the potential fire hazards for your building. The theory behind portable fire extinguishers is that the fire can be extinguished by removing any one or more of these four elements. For each class of fire, the fuel, heat source and chain reaction varies, which is why there must be different types of fire extinguishers depending on the class of fire. For instance, while a class A fire can be safely extinguished with water, a class C fire cannot, as water would conduct the electricity and risk harm to the operator.
Now that you have a basic understanding of the various types of fire and why different extinguishers are necessary, 6 main types of fire extinguishers and their uses will be discussed:. An ABC powder fire extinguisher has numerous advantages as it is a multi-purpose extinguisher and is therefore one of the most common extinguishers to have on hand. A powder extinguisher sprays a very fine chemical powder composed most commonly of monoammonium phosphate.
This acts to blanket the fire and suffocate it. Powder extinguishers are effective for class A, B and C fires, since it is not an electrical conductor and since it can effectively break the chain reaction in a liquid or gas fire, something a water extinguisher cannot do. A carbon dioxide fire extinguisher CO2 is one of the cleanest types of extinguishers to use as it leaves no residue and requires no cleanup.
The CO2 extinguisher does exactly that — extinguishes CO2. By doing so, it removes oxygen from the fire, effectively suffocating it of oxygen. It is perfect for use on class B fires that involve flammable liquids and on electrical fires. The wet chemical extinguisher is a specialized type primarily focused on class K fires, those involving cooking media such as animal and vegetable fats or oils.
These extinguishers contain a solution composed of potassium that effectively launches a two-pronged assault on fires. First, the liquid mist it sprays acts to cool the fire. Second, due to the chemical reaction of the solution with the cooking medium, a thick soap-like substance forms, sealing the surface of the liquid to prevent re-ignition.
The wet chemical extinguisher, then, is ideal for a kitchen setting and class K fires. However, it can also be effective for class A fires where a material such as wood or paper has caught fire. The most versatile of the set, the water mist extinguisher, uses a newer technology that works across most classes of fire. This type of extinguisher releases microscopic water molecules that fight the fire on a variety of levels. First, because so much water is dispersed in such a microscopic fog-like form, the level of oxygen in the air is decreased, which helps to suffocate the fire.
Second, the water particles are drawn to the fire and, as water always does, acts to cool it, reducing the temperature. Finally, and perhaps what is most unique about the water mist extinguishers, is that the water has been de-ionized the minerals have been removed.
Foam fire extinguishers are suitable for class A and the flammable liquids of class B, though not effective for gaseous fires. They spray a type of foam that expands when it hits the air and blankets the fire. This blanket prevents the vapors from rising off the liquid to feed the fire, thus starving it of fuel.
Also, because the foam is mixed with water, it has a cooling effect as well. Foam extinguishers are some of the best for liquid fires, such as gasoline fires, but can also be used on Class A fires involving solid combustibles like wood.
A clean agent fire extinguisher is a type of gaseous fire suppression. Stored in its liquid form, when it is sprayed and hits the air, it converts to its gas form which is non-conductive, safe for use while humans are present, leaves no residue, and has a very short atmospheric lifetime, making it eco-friendly. The gas, often composed of Halon, extinguishes fire by reducing the oxygen levels and impeding the chain reaction.
Because it is non-conductive and so clean, it is ideal for rooms or businesses filled with electrical and computer equipment. They are most commonly used for class B and C fires. Keep in mind, you may need to have different types of extinguishers in different areas of your facility. However, it is not just about having the proper equipment. If it is not maintained, or your employees are not properly trained , the right equipment could fail or be misused. With a team of certified technicians and engineers, Koorsen is equipped to evaluate your facility for the best class of extinguisher, and to inspect, install and maintain them, as well as provide the training you and your staff need.
Topics: Fire Extinguisher. Disclaimer: The information in this article is for informational purposes only. It does not constitute professional advice. The user of this article or the product s is responsible for verifying the information's accuracy from all available sources, including the product manufacturer.
The authority having jurisdiction should be contacted for code interpretations. Subscribe to Our Blog. Recent Posts. For the purpose of this discussion, five classes of fire will be briefly defined: Class A: freely burning, combustible solid materials such as wood or paper Class B: flammable liquid or gas Class C: energized electrical fire energized electrical source serves as the ignitor of a class A or B fire — if electrical source is removed, it is no longer a class C fire Class D: metallic fire titanium, zirconium, magnesium, sodium Class K: cooking fires — animal or vegetable oils or fats Regardless of the type of fire, there will always be the same four elements present: Fuel Heat Oxygen Chain Reaction The theory behind portable fire extinguishers is that the fire can be extinguished by removing any one or more of these four elements.
ABC Powder Fire Extinguisher An ABC powder fire extinguisher has numerous advantages as it is a multi-purpose extinguisher and is therefore one of the most common extinguishers to have on hand. Carbon Dioxide Fire Extinguisher A carbon dioxide fire extinguisher CO2 is one of the cleanest types of extinguishers to use as it leaves no residue and requires no cleanup. Wet Chemical Fire Extinguisher The wet chemical extinguisher is a specialized type primarily focused on class K fires, those involving cooking media such as animal and vegetable fats or oils.
Water Mist Fire Extinguisher The most versatile of the set, the water mist extinguisher, uses a newer technology that works across most classes of fire. Thus, a water mist extinguisher is safe and effective for use on classes A, B, C and K fires. Foam Fire Extinguisher Foam fire extinguishers are suitable for class A and the flammable liquids of class B, though not effective for gaseous fires. Clean Agent Fire Extinguisher A clean agent fire extinguisher is a type of gaseous fire suppression.
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Along with ensuring you have the right types of fire extinguisher, you will also need to make sure that you select the right sizes and weights. You can read more about the current UK extinguisher regulations. The fire risk from the different classes of fire in your business premises will determine which fire extinguisher types you need. Whilst there are 5 main types of fire extinguisher, there are different versions of both the Water and Dry Powder extinguishers, meaning there are a total of 8 fire extinguisher types to choose from. The 8 types of fire extinguisher are: —. Below is a summary of the classes of fire, and a quick reference chart showing which types of extinguisher should be used on each. We then provide a detailed explanation of each type of fire extinguisher below.
Subscriber Account active since. When faced with a fire, knowing how to extinguish it can come in handy. That being said, always use your best judgment and proceed with caution, especially because when it comes to extinguishing a blaze, identifying the type of fire can be incredibly important. Here's how to put out the most common types of fires and which fire extinguishers to use for each. Most of us probably don't think much about the distinction between different types of fires, but knowing the difference could be life-saving. Each type of fire involves different flammable materials and requires a special approach.
It's important to make sure you have the right types of fire extinguishers on hand to put out common household fires. Read our fire extinguisher safety tips to learn how to stay safe and don't forget to make sure you have the right coverage if your home sustains fire damage. The first thing to do when choosing a fire extinguisher is to decide which rooms in your house need one. You should keep at least one on each level of your house. Make sure you keep fire extinguishers handy where fires are more likely to start, like in the kitchen and garage. There are four classes of fire extinguishers — A, B, C and D — and each class can put out a different type of fire.
There is a universal system to describe different types of fires. This system incorporates the use of letters, colors, and symbols to help users select an extinguisher.
The 6 Types And Classes Of Fire And How To Attack Them
When you run a business, you are responsible for the safety of your employees and guests. A large part of safety is being prepared for accidents and emergencies such as a fire. You may believe that you are prepared if you have a fire extinguisher on site, but you may not be as prepared as you think. The common fire extinguisher is one of the most well known and widely used safety tools. However, you cannot buy the first fire extinguisher you see and expect it to keep your business safe.