Fire extinguisher is one of the commonly used fire prevention facilities, which is stored in public places or places where fires may occur. So what do you know about fire extinguishers? The following is my knowledge about fire extinguishers, I hope you like it!

Common fire extinguishers 12 1 1 fire extinguishers121fire extinguishers are relatively advanced fire extinguishers, including portable and fixed ones. Its weight is 0.5 kg, 1 kg, 2 kg, 4 kg, 6 kg, 25 kg and 40 kg. According to different needs, it can be installed on fire engines, oil tankers, large floating roof tanks in oil depots, 10,000-ton oil tankers or key parts of underground projects, and can also be installed on large automatic fire extinguishing devices. Portable fire extinguishers are usually used in oil production sites.

Scope of application: efficient, effective, safe and reliable fire fighting oil, organic solvent, precision instruments, documents and archives; Mainly to put out the initial fire.

Dry powder fire extinguisher Dry powder fire extinguisher is a universal fire extinguisher. It relies on the sprayed fire extinguishing powder cover to form an isolation layer on the burning object. When the powder is heated, it will decompose non-combustible gas and reduce the oxygen content in the burning area to extinguish the fire.

Usage: Dry powder fire extinguisher combines the advantages of foam, carbon dioxide and carbon tetrachloride fire extinguisher, and is suitable for extinguishing the initial fire of oil, combustible gas, electrical equipment and substances that burn in water.

3. Carbon dioxide fire extinguisher Carbon dioxide fire extinguisher is a kind of fire extinguisher that relies on suffocation and local cooling. The density of carbon dioxide is high, which is about 1.5 times that of air. At normal pressure, liquid carbon dioxide will vaporize immediately. Generally 1kg liquid carbon dioxide can produce about 0.5m3 gas. Therefore, when putting out a fire, carbon dioxide gas can exclude air and surround the surface of the combustion product or distribute in a relatively closed space, thus reducing the oxygen concentration around the combustible or in the protective space, causing suffocation and extinguishing the fire. In addition, when carbon dioxide is ejected from the storage container, it will quickly vaporize from the liquid into gas, and absorb some heat from the surrounding area to cool down.

Scope of application: Carbon dioxide fire extinguishers are mainly used to put out initial fires of valuable equipment, archives, instruments and meters, electrical equipment below 600 volts and oil.

Selection of fire extinguishers When selecting a fire extinguisher, the following requirements shall be met:

1. Water-type, foam, dry powder, halon and other fire extinguishers should be used to put out Class A fires;

2. Dry powder, foam, haloalkane, carbon dioxide, etc. Class B fires should be put out, and chemical foam extinguisher should not be used to put out water-soluble class B fires;

3. Dry powder, haloalkane and carbon dioxide fire extinguishers should be used to extinguish Class C fires;

4. Halon, carbon dioxide and dry powder fire extinguishers should be used to extinguish the fire of live equipment;

5. Dry powder and halon fire extinguishers should be used to put out fires of Class A, B and C and live equipment;

6. Special dry powder fire extinguishers should be used to put out D-class fires.

Types of fire extinguishers and protection objects

1. Carbon dioxide, carbon tetrachloride,121,difluoro dibromomethane, 2402, 130 1, heptafluoropropane and hexafluoropropane should be selected for the rescue of cultural relics archives;

2. Dry powder, carbon dioxide, carbon tetrachloride,121,difluoro dibromomethane, 130 1, 2402, heptafluoropropane, hexafluoropropane, and anti-solvent foam should be selected for fighting flammable liquids;

3. Dry powder, carbon dioxide, carbon tetrachloride,121,difluoro dibromomethane, 130 1, 2402, heptafluoropropane, hexafluoropropane, etc. should be used to extinguish combustible gas;

4. Dry powder, carbon dioxide, carbon tetrachloride,121,difluoro dibromomethane, 130 1, 2402, heptafluoropropane and hexafluoropropane should be selected for electrical equipment fire extinguishing;

5. Carbon dioxide, carbon tetrachloride,121,difluoro dibromomethane, 130 1, 2402, heptafluoropropane and hexafluoropropane should be used as the fire for precision instruments.

Toxicity of fire extinguishing agent

1, 12 1 1 (difluoro-chlorobromomethane), which is slightly fragrant and toxic at room temperature, must be ventilated after use to prevent poisoning or suffocation;

2. 130 1 (trifluorobromomethane), which is slightly fragrant and toxic at room temperature, must be ventilated after use to prevent poisoning or suffocation;

3, 2402 (Tetrafluorodibromoethane), slightly fragrant at room temperature, toxic when exposed to heat and high temperature, and must wear a gas mask when using;

4. 1202 (difluoro dibromomethane), which is slightly fragrant and toxic at room temperature, must be ventilated after use to prevent poisoning or suffocation;

5.FM200(HFC-227ea) is colorless, odorless and nontoxic at room temperature, and there is no need for ventilation after use;

6, carbon dioxide (CO2), non-toxic and tasteless at room temperature, the gas is suffocating, and it must be ventilated to prevent suffocation after use;

7, carbon tetrachloride (CCl4), slightly sweet at room temperature, toxic in case of open flame, must be ventilated to prevent suffocation after use;

8, dry powder (NaHCo3), non-toxic and tasteless at room temperature, can stimulate the respiratory tract when extinguishing fire, and must be ventilated after use;

9, dry powder (NH4H2PO4), non-toxic and tasteless at room temperature, can stimulate the respiratory tract when extinguishing fire, and must be ventilated after use;

10, dry powder (NH4H2PO4+NaHCo3), non-toxic and tasteless at room temperature, can stimulate respiratory tract when extinguishing fire, and must be ventilated after use.

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