[Firefighting knowledge] Did you know? These 10 types of fire can not be extinguished with water!

Water and fire are incompatible. The importance of water is self-evident for fire fighting. However, not all fires can be extinguished with water.

1, electrical appliances fire

In the event of a fire, the power must first be switched off, and in the event of no power failure it must not be prevented by water or foam because both water and foam can conduct electricity. Use carbon dioxide, dry powder fire extinguisher or dry sand to save, and keep electrical equipment and wires at a distance of 2 meters or more.  

2. Oil pot fire

When the pan is on fire, do not pour with water. Because the water encounters hot oil, it will form a "fry pan" and splash oil everywhere.

The method of fighting is to quickly pour the cut cold vegetables into the pot along the side and the fire will automatically go out. Another method is to use a lid or a large piece of wet cloth that covers the pan to cover the burning pan so that the burning oil does not contact the air.

3. Gasoline fire

Gasoline has a lower density than water. If gasoline is used to save water, dense water sinks, light gasoline floats, and gasoline that remains on the surface of the water will continue to burn. Gasoline will spread throughout the water and expand its combustion. Area, endangering the safety of other cargo and surrounding buildings.

In the event of gas fire, fire extinguishing tools such as foam, carbon dioxide and dry powder fire extinguishers should be used immediately. Water use is strictly prohibited.  

4, paint fire

Do not pour water when paint is on fire. Application of foam, dry powder or 1211 fire extinguisher for fighting or sand.   

5. Chemical dangerous goods fire

In school laboratories, a certain amount of sulfuric acid, nitric acid, hydrochloric acid, potassium alkali metal, sodium, lithium, flammable metal aluminum powder, and magnesium powder are often stored. These items can easily react or burn after they meet water and must not be saved by water. Potassium carbide, sodium carbide, aluminum carbide and calcium carbide, as well as potassium hydride, magnesium hydride, etc., can react with water and release a lot of heat, which may cause fire and explosion.

6, alkali metal fire

Alkali metals (such as potassium, sodium, and zinc powders) Fire: Because water reacts with alkali metals, a violent chemical reaction generates a large amount of hydrogen, which releases a lot of heat and can easily cause explosions. In this type of fire, fire extinguishing agents should be properly selected and local resources should be properly utilized.  

7, metal carbide, hydride fire

Carbide (carbohydrate) decomposes with water and releases a lot of heat, which makes it easy to expand or explode.

8, sulfuric acid, nitric acid, hydrochloric acid fire

These types of fires are not suitable for fighting with strong currents, because the acid reacts with water and causes splashes and outflows. After the acid comes in contact with flammable substances, there is a danger of burning. However, when necessary, spray water can be used to save.

Flammable liquid fires that are lighter than water or not water: In principle, such fires cannot be saved by water, but crude oils and heavy oils can be saved by spray water.

9, molten iron, molten steel fire

Because hot objects come in contact with water, there is a danger of explosion.

Because the water encounters a thousand degrees of high temperature, it quickly vaporizes, and the volume suddenly expands to more than 5,000 times, causing a physical explosion. At the same time when the water vapor is above 1000 degrees, it can be decomposed into hydrogen and oxygen, causing a chemical explosion.

10, high-voltage electrical equipment fire

In the absence of a good grounding device or without cutting off the power supply, it is generally not possible to save water. The first is that water is conductive, which can easily cause short-circuit burning of electrical equipment. Second, high-voltage currents are easily transmitted along the water column to fire-fighting equipment, causing firefighters to be exposed to electricity and causing casualties.

The information in this article comes from the Internet and was reorganized and edited by China Rescue Equipment Network.