Which fires cannot be extinguished with water, and which special fires cannot be extinguished with w

1.Electrical appliances, fire appliances. In the event of a fire, the first thing to do is to cut off the power supply, and if the power cannot be cut off, it must not be extinguished with water or foam, because both water and foam can conduct electricity.

Extinguish with carbon dioxide, a dry chemical fire extinguisher or dry sand, and keep a distance of at least 2 metres from electrical equipment and electrical wiring.

2.Oil pan fire. When the oil pot is **, never pour it with water.

Because the water meets the hot oil, it will form a "fryer", which will make the oil fire splash everywhere. The way to extinguish the fire is to quickly pour the cut cold vegetables into the pot along the edges, and the fire will be extinguished automatically. Another method is to cover the oil pan with a pot lid or a large wet cloth that can cover the oil pan, so that the burning oil fire can not contact the air and suffocate due to lack of oxygen.

3.Gasoline fires. Gasoline is less dense than water, if the gasoline catches fire and is extinguished with water, the dense water sinks, the light gasoline floats up, the gasoline floating on the water will still continue to burn, and the gasoline will spread everywhere with the water, expanding the burning area, endangering the safety of other goods and surrounding buildings.

In case of gasoline fire, fire extinguishing tools such as foam, carbon dioxide and dry powder fire extinguishers should be used immediately to extinguish the fire, and it is strictly forbidden to extinguish it with water.

4.Paint fires. Paint should never be poured with water. Foam, dry powder or 1211 fire extinguishing appliances or sand should be used for extinguishing.

1. Alkali metal (such as potassium, sodium) fires cannot be extinguished with water. Because after water encounters alkali metals, it will undergo a violent chemical reaction to generate a large amount of hydrogen, releasing a large amount of heat, which is easy to cause.

2. Metal carbide fires cannot be extinguished with water. For example, calcium carbide (calcium carbide) decomposes when exposed to water and releases a large amount of heat, which is easy to expand or occur.

3. Sulfuric acid, nitric acid and hydrochloric acid fires should not be extinguished with strong water flow. Because the acid is impacted by water, it causes splashing, which is easy to injure people, and the splashed acid is in contact with combustible substances, which has the risk of combustion. However, if necessary, it can be extinguished with a spray stream of water.

4. In principle, flammable liquid fires with a small specific gravity of water or insoluble in water cannot be extinguished with water, but heavy oil can be extinguished with spray water. Gas (such as liquefied petroleum gas, coal gas, natural gas) fires cannot be extinguished with water, and water cannot extinguish gas fires.

5. In the case of a fire in a high-voltage electrical installation, it cannot be extinguished with water in the absence of good grounding equipment or without cutting off the power supply, because water will conduct electricity.

6. Class F fires caused by oil pans and stir-frying.

Oils, alkali metals, alkali metal carbides, and so on, which are less dense than water.

1. Electrified fires cannot be directly extinguished with water. Because it may cause electric shock or great damage to electrical equipment, dry powder fire extinguishers such as ammonium phosphate and carbon dioxide fire extinguishers should be used to extinguish the fire.

2. Oil and alcohol fires. Because oil and alcohol are lighter than water, the former will float on the surface of the water when splashed with water, increasing the burning area and thus increasing losses. To extinguish grease and alcohol fires, the air isolation method should be used to quickly cover the burning object with an object to achieve the effect of isolating the air to extinguish the fire.

3. Dry powder and carbon dioxide fire extinguishers should generally be used for fire fighting with gas combustion.

4. Metal fires are generally extinguished by dry sand or soil covering.

5. Combustible dust, such as flour, aluminum powder, powdered sugar, pulverized coal and other fires, cannot be extinguished with water to prevent the formation of high-quality mixtures.

6. When a fire occurs in a place where a large amount of sulfuric acid, concentrated nitric acid, hydrochloric acid and other items are stored, it cannot be extinguished with water to prevent more violent combustion caused by exothermy.

Electrical fires (live fires, water is conductive),

Liquid fire (e.g., oil, not to mention insoluble in water, still floating on the surface of water).

Fires on objects that react with water (e.g. sodium metal, which only grows larger with water).

In a fire where the density is less than that of water or a flammable liquid that is insoluble in water, it cannot be extinguished with water. For example, when gasoline, kerosene, diesel, benzene, alcohols, ethers, esters, etc. are burned, water cannot be used to extinguish the fire, otherwise a large amount of flammable liquid will flow with the water, which is easy to cause the spread of fire.

Electrical appliances and fuel oil fires cannot be extinguished with water.