What fires can t foam fire extinguishers be used for?

Ordinary foam fire extinguisher.

It cannot be used to extinguish fires in live equipment, otherwise it will threaten personal safety. However, if an atomizing nozzle or an intermittent nozzle is used, the air between the water mist can be insulated, and the live fire below 1000V can be extinguished.

Foam fire extinguishers should be stored in a dry, cool, ventilated and convenient place, not close to high temperature or places that may be exposed to the sun to prevent carbonic acid decomposition and failure; In winter, anti-freezing measures should be taken to prevent freezing; And the dust should be wiped frequently, and the nozzle should be dredged to keep it unobstructed.

It is not possible to extinguish electrical fires, water-based fires, valuables, and instrument fires.

Because the foam contains 97% of the water, it cannot extinguish electrical fires (water is conductive) and waterproof material fires (it can be burned when combined with waterproof items), and valuables and instrument fires (leaving stains).

1. What is the understanding of fire extinguishers?

A: A fire extinguisher is a portable fire extinguishing tool. Chemicals are placed inside the fire extinguisher to extinguish the fire.

Fire extinguishers are one of the common fire prevention facilities, stored in public places or places where fires may occur, different types of fire extinguishers are filled with different ingredients, and are specially designed for different fire causes. Care must be taken when using it to avoid counter-effects and dangers.

Foam fire extinguishers cannot extinguish fires with water-soluble flammable and flammable liquids (such as alcohols, esters, ethers, ketones and other substances) and Class E (electrified) fires.

The foam sprayed by the foam fire extinguisher has moisture, which can react with organic substances such as alcohols, esters, ethers, and ketones, and is also a conductor of electricity, so it cannot be used to extinguish these two types of fires.

Ordinary foam fire extinguishers should not be used to extinguish fires with live equipment, otherwise they will threaten personal safety.

However, if the atomization nozzle or intermittent nozzle is used, the air insulation between the water mist can be extinguished, and the live fire below 1V can be extinguished.

Fire extinguishing principle: When extinguishing a fire, a large amount of carbon dioxide and foam can be sprayed, which can adhere to the combustibles, so that the combustibles are isolated from the air to achieve the purpose of extinguishing the fire.

Scope of application: It can be used to extinguish fires caused by the burning of wood, cotton cloth, etc. Foam fire extinguisherThis type of fire extinguisher is a chemical reaction that mixes the acidic solution and the alkaline solution in the cylinder, and presses the generated foam out of the nozzle and sprays it out to extinguish the fire.

In addition to being used to extinguish general solid matter fires, it can also extinguish fires of flammable liquids such as oil, but cannot extinguish fires of live equipment and organic solvents such as alcohols, ketones, esters, and ethers. There are three types of foam fire extinguishers: MP type portable type, MPZ type portable boat type and MPT type cart type. The following takes the MP-type portable type as an example to briefly explain its use and precautions.

The MP portable foam fire extinguisher is mainly composed of a cylinder, a cap, a bottle and a nozzle. The cylinder is filled with alkaline solution, and the bottle bile is filled with acidic solution, and the bottle bile is capped with a bottle cap to prevent the acidic solution from evaporating or mixing with the alkaline solution due to ** splashing. When using a fire extinguisher, you should hold the ring in one hand and grasp the base map with the other, turn the fire extinguisher upside down, shake it lightly a few times, spray foam, and extinguish the fire.

Because foam is electrically conductive, it can cause short circuits and electric shocks when used to extinguish electrical fires. Larger fires can also form.

It cannot extinguish the fire of water-soluble flammable and flammable liquids in Class B fires, such as alcohols, esters, ethers, ketones and other substances; It is also not possible to extinguish live equipment and Class C and D fires.

What fires can't be extinguished with a foam fire extinguisher? Star Awareness Project

Types of foam fire extinguishers that cannot be used to extinguish fires: fires of water-soluble flammable and flammable liquids in Class B fires, such as alcohols, esters, ethers, ketones and other substance fires; It is also not possible to extinguish live equipment and Class C and D fires.

Types of foam fire extinguishers that cannot be used to extinguish fires:

1. Class A fire: refers to the fire of burning carbon-containing solid combustibles, such as wood, cotton, wool, hemp, paper, etc.;

2. Class B fire: fire burning of nails, B and C liquids, such as gasoline, kerosene, methanol, ether, acetone, etc.;

3. Class C fire: refers to the fire of combustible gas, such as gas, natural gas, methane, acetylene, hydrogen, etc.;

4. Class D fire: refers to the fire of combustible metals, such as potassium, sodium, magnesium, titanium, zirconium, lithium, aluminum-magnesium alloy, etc.; AFFF can extinguish two kinds of fire Personally, I think bubbles are much better than dry powder, and the dry powder is too uncomfortable to inhale Fifth, charged fire: refers to the fire of burning live objects.

Foam fire extinguisher scope of application:

It can be used to extinguish Class A fires, such as fires caused by the burning of solid substances such as wood and cotton; It is most suitable for fighting Class B fires, such as gasoline, diesel and other liquid fires; It cannot extinguish fires of water-soluble flammable and flammable liquids (such as alcohols, esters, ethers, ketones and other substances) and Class E (electrified) fires.

This type of fire extinguisher is a chemical reaction that mixes the acidic solution and the alkaline solution in the cylinder, and the generated foam is pressed out of the nozzle and sprayed out to extinguish the fire. In addition to being used to extinguish general solid matter fires, it can also extinguish fires of flammable liquids such as oil, but cannot extinguish fires caused by live equipment and organic solvents such as alcohols, ketones, esters, and ethers.

Classification and characteristics of foam fire extinguishers.

Air foam fire extinguisher: the biggest feature is that it can extinguish water-soluble fire accidents.

Cart type foam fire extinguisher: It is the same principle as the portable foam fire extinguisher, but there are some differences in appearance.

Portable Foam Fire Extinguisher: This is our most common foam fire extinguisher, and there are many places where such fire extinguishing equipment is available.

How to use a foam fire extinguisher:

First: Correctly hold the foam fire extinguisher: usually the right hand should hold the fire extinguisher pressure handle, and the left hand should cooperate with the point of holding up the fire extinguisher, and the whole action should be light and fast;

Second: use the foam fire extinguisher correctly: at a distance of 5 meters from the fire site, squat on the ground with your legs apart, the fire extinguisher nozzle facing outward, and the right and left hands cooperate to tilt the fire extinguisher; Get up and turn the fire extinguisher upside down, shake the nozzle downward, aim at the source, and then release the fire extinguisher and extinguish the nozzle, pay attention to protecting your own safety;

Third: After extinguishing the fire, place the fire extinguisher on the ground with the nozzle always facing downward.

Foam fire extinguishers have two distinctive features:

Clean and environmentally friendly: The foam fire extinguisher adopts the foam principle, so there will be no toxic residue, relatively speaking, it will not cause any harm to our human body, and it will not cause pollution to the air;

Easy to operate: The whole process of operation is simple and easy to learn, and many units and schools have had such fire drills.

a. Unable to extinguish electrical fires; b. Cannot extinguish the fire of water-resistant items; c. Fires of valuables and instruments. Because the foam contains 97% of the water, it cannot extinguish electrical fires (water is conductive) and water-avoiding material fires (and water-related items can be burned when touched), and valuables and instrument fires (leaving traces of dirty).

c.Sodium metal fire extinguishers are used to mix the acidic solution and the alkaline solution in the cylinder to carry out a chemical reaction, and the generated foam is pressed out of the nozzle and sprayed out for fire extinguishing. In addition to being used to extinguish general solid matter fires, it can also extinguish flammable liquids such as oil, but it cannot repent of extinguishing fires of live equipment and organic solvents such as alcohols, ketones, esters, and ethers.

Foam fire extinguishers can't extinguish hail fires? Xingzhi Planning Hall grinding

Foam fire extinguishers cannot be used to extinguish water-soluble flammable or flammable liquids, and Class E fires. Fires caused by alcohols, esters, ethers, and other substances are known as fires of water-soluble flammable and flammable liquids. Category E fires refer to fires caused by electrically charged objects and precision instruments.

The foam fire extinguisher has two containers inside to hold the aluminium sulphate and sodium bicarbonate solutions. When a foam fire extinguisher needs to be used, it should be turned upside down and the two solutions should be mixed well to produce a chemical reaction that produces a large amount of carbon dioxide gas. In addition, some foaming agent is added to the fire extinguisher, so when the switch is turned on, foam will be sprayed.

The foam sprayed on the combustible material can not only isolate the air, but also reduce the temperature, so as to achieve the purpose of extinguishing the fire.

A foam fire extinguisher is a common type of fire extinguishing equipment that uses a foaming agent to extinguish a fire. However, foam fire extinguishers are not suitable for all types of fires. The following are the types of fires that foam fire extinguishers cannot be used to extinguish:

Electrical fires: The moisture in a foam fire extinguisher conducts electricity, and using a foam fire extinguisher to extinguish an electrical fire may result in an electric shock accident. Fires caused by electrical equipment should be extinguished using a dry chemical fire extinguisher or a carbon dioxide fire extinguisher.

Oil fires: The foaming agent in the foam fire extinguisher reacts with the grease of the oil fire to produce a chemical reaction that exacerbates the fire. For oil fires, a dry chemical fire extinguisher should be used to extinguish it, as dry powder has the effect of separating oxygen and heat.

Metal fires: Foam fire extinguishers cannot effectively extinguish metal fires because the combustion temperature of metal fires is very high, and it is difficult for foaming agents to form a protective layer to isolate oxygen. For metal fires, they should be extinguished with a special metal fire extinguishing agent of the land family, such as the metal fire extinguishing agent in a dry chemical fire extinguisher.

High-pressure gas fires: Foam fire extinguishers cannot effectively extinguish high-pressure gas fires because foaming agents cannot form an effective isolation and suppression effect. For high-pressure gas fires, special extinguishing agents should be used, such as carbon dioxide extinguishers or dry chemical extinguishers.

It should be noted that different types of fire extinguishers are suitable for different types of fires, and choosing the right fire extinguisher can improve the effectiveness of extinguishing fires and ensure safety. When facing a fire, it is necessary to choose the right fire extinguisher according to the type of fire and the specific situation, and follow the correct fire extinguishing method and operation steps. At the same time, if the fire is uncontrollable or dangerous, you should immediately call the fire alarm** and evacuate the scene and wait for professional firefighters to extinguish the fire.