Compiled by Fire Safety Knowledge 200943 III ● Derivation Studio 2 1. Class A fires refer to fires in which carbon-containing solid combustible objects, such as wood, cotton, wool, linen, paper, etc. are burned (water is The best fire extinguishing agent); 2. Class B fires involving nails, Class B and C liquids, such as gasoline, kerosene, diesel, methanol, ether, acetone, etc. (dry powder, carbon dioxide); 3. Class C fires refer to flammable gases , such as: fires burning gas, natural gas, hydrogen, methane, acetylene, propane, etc. (carbon dioxide); 4. Class D fire refers to the burning of flammable metals, such as: potassium, sodium, magnesium, titanium, zirconium, lithium, aluminum-magnesium alloy, etc. fire (special light metal fire extinguisher); 5. Live fire refers to a fire in which charged objects burn (dry powder, carbon dioxide, do not use water). Types of Fire 200943 Compiled by 3 ● Derivation Studio 3 1. Cooling Fire Extinguishing Method The principle of this fire extinguishing method is to spray the fire extinguishing agent directly onto the burning object to lower the burning temperature below the ignition point and stop the burning. Or spray fire extinguishing agent on materials near the fire source to prevent new fire points from being formed by the heat radiation of the flame. The cooling fire extinguishing method is the main method of extinguishing fires. Water and carbon dioxide are commonly used as fire extinguishing agents to cool down and extinguish fires. The fire extinguishing agent does not participate in the chemical reaction during the burning process during the fire extinguishing process, and it is a physical fire extinguishing method. Basic methods of fire extinguishing 200943 3 Compilation ● Derivation Studio 4 2. Isolation fire extinguishing method The principle of this fire extinguishing method is to isolate or remove burning materials from surrounding unburned combustible materials, interrupt the supply of combustible materials, and allow burning Stopped due to lack of combustibles. Specific methods include: 1. Remove flammable, combustible, explosive and other items near the fire source; 2. Close the valves of flammable gas and liquid pipelines; 3. Try to stop the spread of flammable and flammable items; 4. If possible, Demolish flammable buildings adjacent to the fire source to form a space zone to prevent the spread of fire. Basic methods of fire extinguishing 200943 Compiled by 3 ● Derivation Studio 5 3. Suffocation fire extinguishing method The principle of this fire extinguishing method is to prevent air from flowing into the burning area or to use non-combustible materials to dilute the oxygen content in the air, so that the combustion does not receive enough oxygen and stop. Specific methods include: 1. Cover burning objects with sand, cement, wet sacks, wet quilts, etc.; 2. Spray mist water, dry powder, foam and other fire extinguishing agents to cover burning objects; 3. Use water vapor or inert gases such as nitrogen and carbon dioxide. Fill the containers and equipment where the fire broke out; 4. Seal the buildings, equipment and holes where the fire broke out. Basic methods of fire extinguishing 200943 3 Compilation ● Derivation Studio 6 4. Suppression of fire extinguishing method The principle of this fire extinguishing method is to allow the fire extinguishing agent to participate in the combustion reaction process. For example: use a 1211 fire extinguisher to spray the burning material, etc.