Portable or shoulder-mounted fire extinguisher can be rushed to the fire site, about 5 meters from the burning place, put down the fire extinguisher. When outdoors, choose to spray in the windward direction. If the dry powder fire extinguisher used is of external hanging storage type, the operator should hold the spray in one hand and lift the open lifting ring on the gas storage bottle in the other hand. If the cylinder is turned on by hand wheel, turn counterclockwise and rotate to position, then lift the fire extinguisher. When the dry powder erupts, it shoots quickly at the root of the flame. Use dry chemical fire extinguisher is built-in air cylinder or reservoir pressure, the operator should be pulled open the insurance on the pin, and then hold the injection hose front end of the nozzle, another hand will open, under pressure to open the fire extinguisher to put out the fire. When using a fire extinguisher or a fire extinguisher with a spray hose, always press down the handle with one hand.
Dry powder fire extinguisher saves the flammable and combustible liquid fire, should be to flames shooting, if the fighting and flowing liquid fire is burning, should be the root of flames from near and far, and shooting, until all put out the blaze. If the flammable liquid burns in the container, the user should aim at the root of the flame and shake it to the left and right, so as to cover the entire open surface of the container with the dry powder flow. When the flame is ejected from the container, the user should continue to spray until the flame is completely extinguished. When extinguishing the flammable liquid fire in the container, attention should be paid to not direct the nozzle towards the liquid surface to spray, so as to prevent the impact of the spray flow from splashing out of the flammable liquid and expanding the fire, causing the fire extinguishing difficulties. If when the flammable liquid in a metal container combustion time is too long, flammable liquid container wall temperature is higher than fighting the self-ignition point, easy to cause fire at this time and then the phenomenon of resurgence, if with foam fire extinguisher combination, the extinguishing effect is better.