Which fires cannot be extinguished with water?

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Time of issue:2019-09-17 18:34
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(Summary description)Alkali metal (such as potassium, sodium, zinc powder) fire: Because the water reacts with alkali metal, a violent chemical reaction generates a large amount of hydrogen, releasing a large amount of heat

Which fires cannot be extinguished with water?

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Which fires cannot be extinguished with water?

(Summary description)Alkali metal (such as potassium, sodium, zinc powder) fire: Because the water reacts with alkali metal, a violent chemical reaction generates a large amount of hydrogen, releasing a large amount of heat

Categories:Industry news
Author:
Origin:
Time of issue:2019-09-17 18:34
Views:

1. Alkali metal fire

Alkali metal (such as potassium, sodium, zinc powder) fire: Because the water reacts with alkali metal, a violent chemical reaction generates a large amount of hydrogen, releasing a large amount of heat, which is easy to cause an explosion. This kind of fire should choose the fire extinguishing agent correctly and make reasonable use of local resources.

2. Metal carbide and hydrogen fire

For example, carbide (calcium carbide) decomposes with water and releases a large amount of heat, which may cause the combustion to expand or explode.

3, sulfuric acid, nitric acid, hydrochloric acid fire

Such fires should not be extinguished with strong water flow, because acid reacts with water, causing splashes and outflows to injure people. When the acid flowing out contacts with combustible materials, there is a danger of burning. However, if necessary, it can be saved with a spray of water. Flammable liquid fires that are lighter than water or insoluble in water: In principle, such fires cannot be saved with water, but crude oil and heavy oil can be saved with spray water.

4. Melted molten iron and molten steel fire

Because hot objects come into 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.

5, high-voltage electrical equipment fire

In the absence of good grounding equipment or without cutting off the power supply, it is generally impossible to save with water. First, the water is electrically conductive, which may cause short-circuiting of electrical equipment; secondly, high-voltage current is easily transmitted along the water column to the fire-fighting equipment, causing firefighters to contact the electricity and causing casualties.

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