1. Lift the fire extinguisher to a proper position far away from the fire source and turn it up and down several times to loosen the dry powder in the barrel.
Step 2 remove the lead seal
Step 3 Pull out the safety pin
4. Aim the nozzle at the most violent burning place, pull out the safety pin and press the handle, and the fire extinguishing agent will be sprayed out to extinguish the fire.
5. 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. When the delay is 1-4 seconds, dry powder will be sprayed to extinguish the fire.
1, portable dry powder fire extinguisher to adapt to the fire and usage:
Sodium bicarbonate dry powder fire extinguisher is suitable for the initial fire of flammable, combustible liquids, gases and charged equipment; Ammonium phosphate dry powder fire extinguisher can be used not only for the above kinds of fires, but also for the initial fire of solid substances. But they can't put out the fire of metal burning.
When putting out a fire, you can quickly walk to the fire with a fire extinguisher in your hand or a fire extinguisher on your shoulder, and put down the fire extinguisher about 5 meters away from the burning place. If you are outdoors, you should choose to spray against the wind. If the dry powder fire extinguisher used is of external pressure storage type, the operator should hold the spray gun tightly with one hand and lift the opening bail on the gas cylinder with the other hand. If the cylinder is opened by handwheel, loosen it counterclockwise, turn it to the highest position, and then lift the fire extinguisher. When the dry powder is ejected, it is quickly aimed at the root of the flame. If the dry powder fire extinguisher used is built-in gas cylinder or pressure storage type, the operator should first unplug the safety pin on the opening handle, then hold the nozzle at the front end of the spray hose, and press the opening handle with the other hand to open the fire extinguisher to extinguish the fire. When using a fire extinguisher with a spray hose or an accumulator fire extinguisher, always hold down the handle with one hand and never let go, otherwise the spray will be interrupted.
When using dry powder fire extinguisher to put out flammable and combustible liquid fires, the root of the flame should be sprayed accurately. If the extinguished liquid fire is burning, it should be sprayed to the root of the quasi-flame from near to far, left and right, until all the flames are extinguished. If combustible liquid burns in the container, the user should shake the root of quasi-flame left and right to make the sprayed dry powder flow cover the whole opening surface of the container; When the flame is driven out of the container, the user should continue to spray until the flame is completely extinguished. When extinguishing the flammable liquid fire in the container, it is necessary to pay attention to the fact that the nozzle is not directly aimed at the liquid level to prevent the impact of the jet from splashing flammable liquid, which will expand the fire and bring difficulties to the fire extinguishing. If the flammable liquid burns in a metal container for a long time, the wall temperature of the container is higher than the self-ignition point of the flammable liquid, and it is easy to re-ignite after fire extinguishing. If we cooperate with foam extinguisher, the fire fighting effect will be better.
When using ammonium phosphate dry powder fire extinguisher to put out solid combustible fire, it should be sprayed in the place where quasi-combustion is the fiercest, up and down, left and right. If conditions permit, the user can spray the fire extinguisher along the periphery of the combustion object, so that the dry powder extinguishing agent can be evenly sprayed on the surface of the combustion object until the flame is completely extinguished. ?
2, the use of cart type dry powder fire extinguisher
Cart-type dry powder fire extinguisher is mainly used to put out the initial fire of combustible liquid, combustible gas and electrical equipment. Cart-type dry powder fire extinguisher has the advantages of convenient movement, simple operation and good fire extinguishing effect.
Pull or push the fire extinguisher to the site, hold the powder spraying gun in your right hand, and spread the powder spraying hose in your left hand until it is straight, and you can't bend or turn around. Then remove the lead seal, pull out the safety pin, press the air supply valve with your palm, hold the powder spray gun butt with your left hand, pull the powder spray switch with your right hand with your fingers, aim at the flame spray, and swing the powder spray gun back and forth and left and right continuously to cover the burning area until the fire goes out.
Fire extinguishing principle of dry powder fire extinguisher;
Dry powder fire extinguisher is equipped with dry powder extinguishing agent. Dry powder fire extinguishing agent is a kind of dry and easy-flowing fine powder used for fire extinguishing, which is composed of inorganic salts and a small amount of additives. It is dried, crushed and mixed into fine solid powder. It is a kind of fire extinguishing agent widely used in fire fighting, mainly used for fire extinguishers.
In addition to the special dry powder chemical fire extinguishing agent for fighting metal fires, dry powder fire extinguishing agents are generally divided into BC dry powder fire extinguishing agent and ABC dry powder fire extinguishing agent. Such as sodium bicarbonate dry powder, modified sodium salt dry powder, potassium salt dry powder, ammonium dihydrogen phosphate dry powder, diammonium hydrogen phosphate dry powder, phosphoric acid dry powder and amino dry powder fire extinguishing agent.
Dry powder fire extinguishing agent mainly extinguishes the fire through the physical and chemical effects when the powder mist sprayed by pressurized gas contacts and mixes with the flame;
1 is based on the volatile decomposition of inorganic salts in dry powder, and the free radicals or active groups produced by fuel during combustion have chemical inhibition and secondary catalysis, which interrupts the chain reaction of combustion and extinguishes the fire;
2. Dry powder falls outside the surface of combustible materials, which triggers a chemical reaction under the action of high temperature, forms a glassy coating, isolates oxygen, and then suffocates and extinguishes the fire. In addition, there are some oxygen dilution and cooling effects.
Matters needing attention in using dry powder fire extinguisher:
1. When the portable dry powder fire extinguisher is used, one is to pull up the pull ring, and the other is to press the handle. Now we use the push handle type. When the handle is pressed, the dry powder will be sprayed out. However, it should be noted that the safety pin must be pulled out first, otherwise no dry powder will be sprayed out.
2. The spraying time of portable dry powder fire extinguisher is very short, so before use, aim the powder spraying hose at the flame first, and then open the valve. The spray distance of portable dry powder fire extinguisher is also very short, so when using it, the operator should be as close to the fire source as possible while ensuring his own safety. And according to the combustion range, choose the appropriate specifications of fire extinguishers. If the combustion range is large and the specifications of the fire extinguisher are small, all previous efforts will be in vain.
3. Portable dry powder fire extinguisher does not need to be used upside down, but if the cylinder is tossed up and down several times before use to make the dry powder loose, the spraying effect will be better.
4. Dry powder injection has no concentrated jet, which is easy to disperse after injection, so the operator should stand in the windward direction of the fire source when spraying.
5. Dry powder fire extinguishers should not be fired at the flame from above, but should be fired at the root of the flame, from near to far, pushing forward and sweeping left and right, so as not to let the flame flee back.
6. When fighting a liquid fire, the dry powder fire extinguisher has a strong impact, and it is not allowed to directly hit the liquid surface to prevent the burning liquid from overflowing and expanding the fire.
7. Dry powder fire extinguishers are generally valid for 3-5 years, but they should be checked once a year.
8. Dry powder fire extinguishers should be placed in a convenient, ventilated, cool and dry place to prevent cylinders from getting wet and dry powder from caking. Dry powder fire extinguishers should not be exposed to high temperature, sunlight or below-10 degrees Celsius.