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. Don’t use water.
What is a Class B fire extinguisher good for?
Class B fires involve flammable and combustible liquids such as gasoline, alcohol, oil-based paints, lacquers. Therefore, extinguishers with a B rating are designed to extinguish fires involving flammable and combustible liquids.
What type of fire is a Class B fire extinguisher used?
Class B fires are ones in which flammable liquids and/or gases become involved. They are the fuel source in the fire triangle (fuel, heat, oxygen + chemical reaction). Flammable liquids include gasoline, diesel fuel, oils, tars, petroleum greases, solvents, alcohols, and oil-based paints.
Which fire is Class B fire?
Class B are flammable liquids fires such as fuel, gasoline, kerosene, white-spirit… Class B are flammable gases fires such as ethanol, propane, butane, acetylene, hydrogen, methane… Class C are electrical fires. Class D are flammable metals fires such as powdered aluminium, steel wool, magnesium…
What’s in a Class B fire extinguisher?
Because of this, Class A fire extinguishers use water, while Class B fire extinguishers use dry chemicals (foam or powder), such as aqueous film-forming foam, multi-purpose dry chemicals such as ammonium phosphate, and halogenated agents (such as Halon 1301 and Halon 1211) or highly pressurized carbon dioxide.
When using foam a Class B fire is extinguished by?
Foam extinguishes Class A Fires by cooling the burning material and removing the heat from the combustion triangle. Foam extinguishes Class B Fires by covering the flammable liquid with a foam blanket, thus cutting off the oxygen supply from the combustion process.
What are Class B and C fires?
Class B fires which involve flammable liquids and gases, solvents, oils, greases (excluding cooking oils/greases in depth) tars, oil-based paints and lacquers. Class C fires which involve energized electrical equipment.
What does ABC stand for on a fire extinguisher?
Dry Chemical Extinguishers come in a variety of types. You may see them labeled: • “DC” short for “dry chem” • “ABC” indicating that they are designed to extinguish class A,B,and C fires, or • “BC” indicating that they are designed to extinguish class B and C fires.
Which of the following types of surfaces should a Class B fire extinguisher not be used?
Fire buckets can be used filled with water on Class A fires, or with sand to use as an absorbing agent on spilled flammable liquids (Class B). They must not be used with water on burning fat or oil or on electrical appliances.
What is Class B fire caused by?
So a class B fire is very dangerous as it is the burning of flammable liquids. Examples of flammable liquids include petrol, oil, paraffin, alcohol and certain paints. They can ignite by heating them up to extreme temperatures, or with a simple spark.
How do you fight Class B fire?
In many cases, water will only spread the fuel around and create more fire. To extinguish a Class B fire, you want to cut off the oxygen. You can use carbon dioxide gas to dilute the oxygen available and stop the burning. Smothering the fire with bicarbonate (baking soda) or potassium carbonate will also work.
Where should a Class B fire extinguisher be placed?
1. Where should fire extinguishers be located?
- Class A: Locations that contain ordinary combustible materials, including offices, classrooms, and assembly halls.
- Class B: Workshops, storage areas, garages, warehouses, or service and manufacturing areas that contain flammable liquids or gasses.