Knowledge and usage methods of dry powder fire extinguishers

（1） Fire extinguisher knowledge

The performance of dry powder fire extinguishers can be divided into ordinary (BC) and general (ABC) dry powder. The dry powder inside the cylinder of a dry powder fire extinguisher is sprayed out from the nozzle under pressure during use. Dry powder fire extinguishers are suitable for extinguishing liquid fires, live equipment fires, and are particularly suitable for extinguishing gas fires. This is incomparable to other fire extinguishers. It can also extinguish instrument fires, but leaving powder after extinguishing is not suitable for precision instrument fires.

（2） Instructions and precautions for using fire extinguishers

Usage of dry powder fire extinguisher: When a fire occurs, firefighters should quickly carry the fire extinguisher by hand or shoulder and rush to the fire scene. At a distance of about five meters from the combustion site, the operator should first remove the safety pin on the opening handle; Then hold the front nozzle of the spray hose and use the other hand to press down the pressure handle to extinguish the fire. When extinguishing a fire, it should be done from far to near, with horizontal strafing from left to right; When using a fire extinguisher, one hand should always press down on the handle and not release it, otherwise the spraying will be interrupted.

Precautions for using dry powder fire extinguishers:

When using a portable dry powder fire extinguisher, there are two methods: one is to pull up the pull tab, and the other is to press down the handle. We are currently using a press down handle type, and when we press down the handle, dry powder will be sprayed out. But it should be noted that the safety pin must be removed first, otherwise there will be no dry powder spraying.

2. Portable dry powder fire extinguishers have a short spraying time, so before use, align the powder spraying hose with the flame before opening the valve. Portable dry powder fire extinguishers also have a short spraying distance, so when using them, operators should try to be as close to the fire source as possible while ensuring their own safety. And choose the appropriate specifications of fire extinguishers based on the combustion range. If the combustion range is large and the specifications of the fire extinguisher are small, all previous efforts will be wasted.

3. Portable dry powder fire extinguishers do not need to be used upside down, but if the cylinder is shaken up and down a few times before use to loosen the dry powder, the spraying effect will be better.

4. Dry powder fire extinguishers should not be directed towards flames from above, but should be directed towards the root of the flame, pushing forward from near to far, sweeping horizontally to the left and right, and preventing flames from escaping back.

5. When extinguishing liquid fires, dry powder fire extinguishers have a strong impact force and should not directly impact the liquid surface to prevent the burning liquid from splashing out and expanding the fire.

Under normal circumstances, the validity period of dry powder fire extinguishers can reach 3-5 years, but they should be inspected once a year in between.

7. Dry powder fire extinguishers should be placed in a convenient, ventilated, cool, and dry place to prevent the cylinder from getting damp and the dry powder from clumping. Do not come into contact with high temperatures, do not expose to sunlight, and do not place in areas with temperatures below -10 degrees Celsius.

The above is the knowledge and usage methods of dry powder fire extinguishers shared with everyone, hoping to be helpful.