How to use fire extinguishers

Before introducing the use of fire extinguishers, the classification of fire extinguishers is introduced. There are many types of fire extinguishers (three categories): According to their movement methods, they can be divided into: portable and cart type. According to the power source of driving fire extinguishing agent, it can be divided into: gas storage bottle type, storage pressure type and chemical reaction type. According to the installed fire extinguishing agent, it can be further divided into: foam, dry powder, halogenated alkane, carbon dioxide, acid and alkali, water, and the like.

Portable foam fire extinguisher adapts to fire and how to use it

Scope of application

It is suitable for the fire of general Class B fires, such as oil products, greases, etc. It can also be applied to Class A fires, but it cannot save fires of water-soluble flammable and flammable liquids such as alcohols, esters, ethers and ketones in Class B fires. Such as material fires; it is also impossible to save live equipment and Class C and Class D fires.

Fire extinguisher principle

The method of use can carry the lifting ring on the upper part of the cylinder and quickly go to the fire. At this time, care should be taken not to make the fire extinguisher excessively tilted, and not to be taken horizontally or upside down, so as to prevent the two agents from mixing and ejecting in advance. When the distance is about 10 meters from the fire point, the cylinder can be turned upside down, one hand grips the lifting ring, and the other hand holds the bottom ring of the cylinder, aiming the jet at the burning object. In the event of a flammable liquid fire, if it has been burned in a flowing state, the foam is sprayed from far to near, so that the foam completely covers the surface of the combustion liquid; if it is burned in a container, the foam should be directed toward the inner wall of the container to make the foam Flowing along the inner wall, gradually covering the surface of the fire. Do not directly align with the liquid level spray to avoid the impact of the jet, instead of flushing or flushing the burning liquid out of the container to expand the combustion range. When fighting a solid material fire, the jet should be directed at the most violent place. As the effective spray distance is shortened during the fire, the user should gradually approach the combustion zone and always spray the foam on the combustion product until it is extinguished. When in use, the fire extinguisher should always be in an inverted state, otherwise the spray will be interrupted.

Foam fire extinguishers should be stored in a dry, cool, ventilated and convenient place. Do not be near high temperature or exposed to prevent carbonation from decomposing. In winter, antifreeze measures should be taken to prevent freezing; dust should be wiped off frequently. Unblock the nozzle to keep it open.

Cart type foam fire extinguisher adapts to fire and use method

It adapts to the same fire as a portable chemical foam fire extinguisher.

Fire extinguisher use method

When in use, it is generally operated by two people. The fire extinguisher is quickly pushed and pulled to the fire site. It stops at a distance of about 10 meters from the fire point. After one person applies the spray hose, both hands hold the spray gun and aim at the burning place; the other is reversed first. Turn the handwheel in the hour hand direction, raise the screw to the highest position, open the bottle cap, then pour the cylinder backwards, touch the rod, and rotate the valve handle 90 degrees to spray the foam to extinguish the fire. If the valve is installed at the gun, the valve is opened by the person responsible for operating the gun.

The fire extinguishing method and precautions are basically the same as those of the portable chemical foam fire extinguisher. Because the fire extinguisher has a long injection distance and a long continuous injection time, it can fully exert its advantages and is used to save the initial fire in a large area of ​​a storage tank or a tanker.