Use of fire extinguishers

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Types of fire extinguishers and their usage methods Foam fire extinguishers: applicable fires and usage methods Scope of application: Suitable for extinguishing ordinary Class B fires, such as those involving oil products and fats. They can also be used for Class A fires, but they are not effective against fires involving water-soluble flammable liquids in Class B fires, such as alcohols, esters, ethers, and similar substances； It cannot be used to extinguish live electrical equipment or Class C and Class D fires. 　　Usage: You can hold the handle at the top of the cylinder and rush to the fire scene quickly. At this time, care must be taken not to tilt the fire extinguisher too much; it must not be held horizontally or upside down, to prevent the two agents from mixing and being released prematurely. When at a distance of about 10 meters from the point of ignition, the cylinder can be turned upside down; one hand holds the handle tightly while the other hand supports the bottom ring of the cylinder, aiming the jet at the burning material. When fighting fires involving flammable liquids, if the liquid is already burning and flowing, spray the foam from a distance towards the fire, so that the foam completely covers the surface of the burning liquid ； If burning takes place inside a container, the foam should be directed at the inner walls of the container, allowing it to flow along those walls and gradually cover the surface of the liquid on fire. Be careful not to spray directly at the liquid surface, as the force of the jet could scatter or dislodge the burning liquid out of the container, thereby expanding the area of combustion. When fighting fires involving solid materials, the jet should be directed at the area where the fire is most intense. During fire extinguishing, as the effective spraying distance decreases, the user should gradually move closer to the burning area, always directing the foam at the burning material until it is extinguished. When in use, the fire extinguisher must always be kept inverted; otherwise, the spraying will stop. 　　Portable foam fire extinguishers should be stored in a dry, cool, well-ventilated place that is easy to access; they must not be kept near sources of high heat or areas exposed to direct sunlight, in order to prevent the decomposition of carbonic acid and subsequent loss of effectiveness ； Freezing prevention measures should be taken in winter to avoid freezing ； Dust should also be wiped off regularly, and the nozzles should be cleared to keep them unobstructed. 　　Applicable Fires and Usage Methods of Cart-Type Foam Fire Extinguishers Its applicable fires are the same as those of portable chemical foam fire extinguishers. 　　Usage: When in use, it is generally operated by two people. First, push and pull the fire extinguisher quickly to the site of the fire, stopping at a distance of about 10 meters from the point of ignition. One person then extends the spray hose while holding it firmly with both hands