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.
What extinguisher should you use on Class B fires?
Carbon dioxide extinguishers (CO2)
Carbon dioxide extinguishers do not leave any residue, unlike a foam extinguisher. They can also be used on Class B fires, those involving flammable liquids such paraffin or petrol. CO2 extinguishers work by smothering the fire and cutting off the supply of air.
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 are Class B extinguishers?
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 is a Class B fire extinguisher made of?
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.
What causes Class B fire?
What is a Class B fire? Class B fires are fires which involve flammable or combustible liquids. The presence of these liquids, which are also known as hydrocarbon fuels, represent the fuel aspect of the fire triangle (heat, fuel and oxygen) and provide the materials necessary to begin, develop and maintain a fire.
How do you extinguish different types of fire?
Types of Fires and How to Extinguish Them
- Class A Fires – Extinguish with Water. …
- Class B Fires – Extinguish by Depleting Oxygen. …
- Class C Fires – Extinguish by Cutting Power. …
- Class D Fires – Extinguish with Dry Powder Agents. …
- Class K Fires – Extinguish with Chemical Fire Extinguishers. …
- Professional Fire Damage Restoration.
Which of the following can be used on Class A and Class B fires?
Foam: These extinguishers work on both Class A and B fires. The foam agent works on Class B fires by separating the fuel and the oxygen by creating a seal on the surface of the flammable liquid. However, these extinguishers will only be effective when the flammable liquid is not free-flowing.
When attempting to extinguish a Class A or Class B fire in an open area which of the following should you avoid?
When fighting a Class B fire, do not use water. 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.
Which is a commonly used method of extinguishing Class B fires quizlet?
Halon 1301 and Halon 1211 are most commonly used as extinguishing agents for Class B and Class C fires.