CO2 fire extinguishers have many different types in terms of capacity and shape (manufactured by many different countries, but all have the same structural properties and preservation effects. CO2 gas consists of 1 carbon atom and 2 oxygen atoms forming called oxytcarbon.CO2 is an odorless, colorless, non-conductive inert gas that is 15 times heavier than air.
1. CO2 tank structure: there are 3 main sets. CO2 tank shell: made of metal with high pressure of 250kg/cm Exhaust gas intake valve system (handwheel or duckbill structure) safety valve. Speaker nozzle: made of heat-insulating material
2. Specifications: CO2 compresses into the tank with a maximum pressure of 180kg/cm and liquefies in the tank. When sprayed out of the tank in a gaseous state (such as dew, cold snow.) from 76C to 80C. 1kh liquid CO2 gas sprayed out into the atmosphere with 0C insulation creates 0.51m3 of gas.
3. Fire fighting effect of CO2: Reduces the oxygen content to the point where it does not support combustion Dilute the burning mixture Chilled
4. CO2 tanks can fight fires: Liquid or liquefiable solid (class B fire) Gaseous combustion (class C fire) Fire electrical equipment Burning organic solids, together with red flames. (Fire in closed conditions using CO2 is highly effective in fighting fire) 5. CO2 cylinders are not suitable for fighting fires: Chemicals containing an oxygen source (e.g. cellulose, nitrate) Reactive metals and their hydroxides Coke and black explosives.
6. Operation: When a fire occurs, bring a CO2 tank to approach the fire Withdraw the safety substance or remove the lead clip. One hand holding a loudspeaker sprayed on the fire until the fire was extinguished. When spraying standing at the windward end, do not hold hands at the connection positions with the sprayer, do not spray on people because it may cause frostbite or CO2 is too concentrated to cause asphyxiation.
7. CO2 tank preservation: Store in a cool, dry place for easy access. Place in a place where the temperature does not exceed 55°C. Do not store in a humid place and do not apply grease.
Currently, our country is using 3 types of Chinese powder fire extinguishers: MF system, MFZ system and ZYW automatic fire extinguisher. The MF system inside has a CO2 propellant gas tank. There is no clock separately. The propellant gas MFZ system is directly loaded into the metered powder tank, and the propellant gas N2. The automatic fire extinguisher is composed of a hanger, a nozzle insulation pipe, a spherical tank.
1. Structure of fire extinguisher powder: There are many different designs but all have 3 main parts. High pressure metal powder and propellant gas tank Valve system Nozzle and spray speaker
2. Specifications and techniques: The fire extinguishing powder in the tank is a white chemical mixture, a fine powder, with any type of effect, it is indicated to extinguish fires of that type effectively (powder ABC, BC, AB) Powder weight depends on the container's capacity. When pushing CO2, N2 is contained in the tank, containing powder or contained in a steel tank, located in the powder container. Pushing pressure from 14-16kg/cm2 The propellant gas powder is inert, non-flammable, non-conductive with voltage below 50kw. Can only be used once.
3. Fire fighting effect: Loosen the concentration of the mixture of combustibles and oxygen in the fire zone Suffocate and cool the fire.
4. Powder extinguishers can fight fires: Cure newly arising fires very effectively. Cure solid, liquid, gas, chemical fires, electric fires with voltage below 50v. What symbol is on the bottle, it can effectively fight that type of fire.
5. Manipulation: When there is a fire, carry a powder bottle to approach the fire. Unscrew the safety pin, invert the shaker a few times. With one hand holding the speaker, the spray is directed at the source of the fire, about 1.5m from the base of the fire, while the other hand squeezes the speculum, the powder is sprayed on to extinguish the fire. When spraying on the head of the wind.
6. Preservation of powder jars Keep in a dry place, easy to see and easy to take Place where the temperature is less than 55oC Do not leave in a humid place with a lot of grease.
C. FIRE BLANKET - Blankets used in fire fighting are usually made of cotton yarn (usually sheep blankets), are easy to absorb water, have the usual size of (2 x 1.5)m or (2 x 1.6)m. - When detecting a fire, it is necessary to dip the blanket in water so that the water evenly penetrates the blanket and then cover the fire to separate the fire from the outside environment (asphyxiation effect), not to let oxygen of the environment into the fire area. The reason for dipping the blanket in water before fighting a fire is to let the cotton fiber expand to increase the tightness on the surface of the blanket, moreover, when the blanket is soaked in water, it will have the effect of reducing the temperature of the fire, leading to the fire being extinguished. Turn off. - When extinguishing a fire, hold the two corners of the blanket firmly with both hands, raise it up in front to cover your face and quickly cover the fire, the fire will be extinguished.
D. SAND (SAND CONTRACTOR, CASTING) - Sand has a melting point of 1.7100C to 1,7250C, boiling point is 2,5900C, so it has a great ability to collect heat. When putting sand on a fire, one side of the sand absorbs heat, lowering the temperature of the fire, on the other hand, the sand covers the fire creating a membrane that separates oxygen from the fire, causing the fire to go out (asphyxiation effect). Sand is an easy to obtain, cheap and easy to use fire extinguishing agent. Sand is often used to fight liquid fires very effectively. Sand also has the effect of enclosing and separating the burning liquid from spilling around, causing fire spread. At petroleum facilities, laboratories, chemical warehouses... people often store sand for fire fighting. - To serve the effective fire fighting, sand is usually arranged in barrels, drums, tanks or stored in deep holes on the ground near the objects to be protected. To put out the fire and put sand on the fire, at the sand storage place, it is also necessary to arrange a shovel to shovel sand or a bucket or bucket to scoop up the sand and put it on the fire. Shovels, buckets, and barrels are often painted red to indicate use for fire fighting purposes.
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