What are the common fire extinguishing methods?

There are four basic fire fighting methods:

1. cooling fire extinguishing: for general combustible substances, one of the conditions for continuous combustion is to reach their respective ignition temperatures under the action of flame or heat. Therefore, for the general combustible fire, when the combustible is cooled below its ignition point or flash point, the combustion reaction will stop. The fire extinguishing mechanism of water is mainly cooling.

2. Asphyxiation and fire extinguishing: The combustion of various combustible materials must be carried out above its minimum oxygen concentration, otherwise the combustion cannot continue. Therefore, the fire can be extinguished by reducing the oxygen concentration around the combustion products. The common fire extinguishing mechanism of carbon dioxide, nitrogen and steam is mainly suffocation.

3. Isolation and fire extinguishing: the combustible substance is isolated from the fire source or oxygen, and the combustion reaction will automatically stop. In case of fire, close the relevant valves and cut off the passage of combustible gas and liquid to the fire area; Opening the relevant valves to lead the liquid combustible in the container that has been burned or threatened by fire to a safe area through pipelines are all measures to isolate and extinguish the fire.

4. Chemical suppression fire extinguishing: that is, the fire extinguishing agent reacts with the intermediate free radicals in the chain reaction, thus interrupting the chain reaction of combustion and making the combustion unsustainable. The main fire extinguishing mechanism of commonly used dry powder fire extinguishing agents and halon fire extinguishing agents is chemical inhibition.