How to use dry powder chemical extinguisher

Dry powder chemical fire extinguishers are an important firefighting equipment, widely used in various places to deal with sudden fires. Its main components include the fire extinguisher cylinder, nozzle, pressure handle and safety pin. Before using, it is very important to ensure that the fire extinguisher is in good condition. The inspection content includes no obvious damage, no leakage, and confirming that the pressure gauge pointer is in the green area, indicating that the pressure is normal. In addition, the smoothness of the nozzle should also be checked to ensure that the fire extinguishing agent can be effectively sprayed.

When a fire occurs, keeping calm is the first principle for dealing with crises. First, it is necessary to determine the type of fire source and confirm whether the fire is within the scope of application of the dry powder fire extinguisher. Dry powder fire extinguishers have good fire extinguishing effects for Class A (solid material fire), Class B (liquid fire), Class C (gas fire) and Class E (live equipment fire). However, for metal fires, certain chemical fires and large-scale flowing fires in oil fires, dry powder fire extinguishers may not be applicable, so you should fully understand the type of fire before using it.

Quickly approach the fire source while ensuring your own safety, but keep a safe distance. The best use distance for a portable dry powder fire extinguisher is usually 3 to 5 meters. When approaching the fire source, special attention should be paid to avoid being bothered by flames, hot air or thick smoke.

When using a fire extinguisher, the correct operating procedures should be followed. Pulling out the safety pin is the key step to activate the fire extinguisher. Only after pulling it out can the pressure handle be pressed down to release the fire extinguishing agent. Next, you need to hold the nozzle with one hand and aim the nozzle at the root of the flame, not the top or middle, to ensure the maximum fire extinguishing effect. The other hand needs to press down the pressure handle hard to make the fire extinguishing agent spray out of the nozzle. During the spraying process, keep the distance between the nozzle and the root of the flame stable, and sweep left and right to ensure that the fire extinguishing agent evenly covers the fire source.

When spraying the fire extinguishing agent, it is crucial to control the angle and force of the spray. When spraying the dry powder fire extinguishing agent, a thick powder mist will form when spraying. This layer of powder mist can quickly cover the flame and isolate oxygen, thereby achieving fire extinguishing. However, if the spraying angle is too large or the force is insufficient, the fire extinguishing agent may not accurately reach the root of the flame, thus affecting the fire extinguishing effect. Therefore, the spraying angle and force should be adjusted in time according to the size and shape of the fire source to ensure the effectiveness of fire extinguishing.

When using a dry powder fire extinguisher, you should also pay attention to several key matters. First, ensure your own safety. During the fire extinguishing process, you need to pay attention to the changes in the fire and your own safety. If the fire is too large or uncontrollable, you should evacuate the scene immediately and call the police for help. Secondly, avoid inhaling dry powder fire extinguishing agents. A large amount of dust will be generated during the spraying process. Long-term or large-scale inhalation may cause irritation or damage to the respiratory tract. Therefore, personal protective equipment such as protective masks should be worn when using it. Finally, after the fire is extinguished, the scene should be handled in time, and the residues of the dry powder fire extinguishing agent should be cleaned up to avoid pollution to the environment.