The most common opening method of dry powder fire extinguisher is to press the handle. Lift the fire extinguisher to a proper position far away from the fire source, turn it up and down several times to loosen the dry powder in the barrel, then aim the nozzle at the place where the fire burns most violently, remove the safety pin and press the knob, and the fire extinguishing agent will be sprayed out to extinguish the fire.

When opening the dry powder fire extinguisher, hold the middle part with your left hand, aim the nozzle at the root of the flame, pull out the safety card with your right hand, turn the opening knob and open the gas cylinder. After a delay of 1-4 seconds, dry powder will be sprayed to put out the fire.

Extended data:

I. Scope of application

Dry powder fire extinguishers can put out general fires and fires caused by burning oil and gas. The dry powder fire extinguisher is powered by carbon dioxide gas or nitrogen gas, and the dry powder in the spray tube is used to extinguish the fire. Dry powder is a kind of dry, easy-flowing fine solid powder, which consists of fire extinguishing base material, moisture-proof agent, flow promoter, anti-caking agent and other additives. It is mainly used to extinguish the initial fires of flammable liquids such as oil and organic solvents, flammable gases and electrical equipment.

Second, classification

Dry powder fire extinguishers can be divided into hand-held, backpack-mounted and cart-mounted.

1. When using an external portable fire extinguisher, hold the nozzle with one hand and lift the bail with the other, and dry powder can be sprayed.

2. When using the cart-type fire extinguisher, put the back of the cart-type fire extinguisher towards the fire source (it should be placed in the upwind direction outdoors), first remove the spray gun, unfold the powder tube (remember that there should be no distortion), and then lift the air intake rod to make carbon dioxide enter the storage tank. When the gauge pressure rises to 0.7 MPa-1 MPa, put down the air intake rod to stop air intake.

At this time, turn on the switch and spray dry powder to extinguish the fire from near to far. For example, when fighting an oil fire, don't let the dry powder airflow directly impact the oil stain, so as to avoid splashing the oil surface and spreading the fire.

3. When using a backpack fire extinguisher, you should stand 5-6 meters away from the edge of the flame and hold the grip of the dry powder gun in your right hand (if it is powered by nitrogen, you can only hold the wooden handle, otherwise you may be frostbitten by low-temperature gas).

Turn the change-over switch to the "3" position with your left hand (spraying sequence is 3, 2, 1), turn on the safety machine, aim the spray gun at the fire source, and pull the trigger to spray dry powder. If you can't put out the fire after spraying a bottle of dry powder, you can turn the switch to the position of No.2 or 1 and continue spraying until the fire is sprayed out.

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