How to Use Dry Powder Fire Extinguisher and Attention Problems

A general fire extinguishing method

According to the principle of combustion, the principle of all fire extinguishing methods is to spray the extinguishing agent directly on the burning object. Or fire extinguishing agent sprayed on the material near the source of fire, so that it does not form a new fire point due to the flame heat radiation.

1, cooling fire extinguishing method

The principle of this fire extinguishing method is to directly inject the extinguishing agent on the burning object so as to lower the burning temperature below the burning point and stop the burning. Or fire extinguishing agent sprayed on the material near the source of fire, so that it does not form a new fire point due to the flame heat radiation. Cooling fire extinguishing method is a main method of fire extinguishing. Commonly used water and carbon dioxide as fire extinguishing agent cool cooling and extinguishing. The extinguishing agent does not participate in the chemical reaction during the extinguishing process. This method is a physical fire extinguishing method.

2, fire extinguishing method

The isolated fire extinguishing method separates or removes the burning material from the surrounding unburned combustible materials, interrupts the supply of combustible materials, and stops the combustion due to the lack of flammable materials. The specific methods are:

1) Remove flammable, flammable, explosive and combustible materials near the fire source;

2) Close the valves of combustible gas and liquid pipes to reduce and prevent flammable substances from entering the combustion zone;

3) Try to stop flammable flammable and flammable liquids;

4) Remove the flammable buildings adjacent to the fire source to form a space zone to prevent the spread of fire.

3. Asphyxiation fire extinguishing method Asphyxiation fire extinguishing method is to prevent air from flowing into the combustion zone or using an incombustible zone or to dilute the air with non-combustible substances so that the combustion cannot be extinguished due to insufficient oxygen. The specific method is:

1) Cover combustion products with sand, cement, wet sacks, wet quilts, and other non-combustible or non-flammable materials;

2) spray mist, water, dry powder, foam and other fire extinguishing agents to cover the combustion;

3) Infuse the fire-fighting containers and equipments with steam, nitrogen, carbon dioxide and other inert gases;

4) Closed fire constructions, equipment and holes;

5) Spray non-combustible gas or non-combustible liquid (such as carbon dioxide, nitrogen, carbon tetrachloride, etc.) into the area of ​​the combustion or on the inflammables.

Second, common sense

Solid fires should be fired with water-based, foam, dry powders of ammonium phosphate, and halogenated fire extinguishers. Liquid fires should be fired with dry powder, foam, haloalkane, and carbon dioxide fire extinguishers. Gas fires should be fired with dry powder, haloalkane, and carbon dioxide fire extinguishers. Charged objects should be fired with haloalkane, carbon dioxide and dry powder fire extinguishers. Fire-fighting equipment for fighting metal fires shall be negotiated with the design department and the local* fire-fighting supervision department. China currently has no regular fire extinguisher products. Now I will grasp the use of portable dry powder fire extinguishers and give them a brief introduction for your reference.

Third, the use of methods

1. Remove the seal and pull out the insurance pin. The operator stands 2-3 meters away from the flame. 2. Hold the nozzle in the left hand at the base of the flame, press the handle in the right hand, and dry the powder. At the same time, the left hand and right hand swing the nozzle appropriately so that the gas sweeps through the entire flame root and gradually moves forward. 3. In case of multiple open flames, fire points can be fired at the movable position until the flame point is completely extinguished and no fire is left until re-ignition is prevented. 1) When the combustible liquid is put into a squib-like combustion, the user should aim at the flame root from near and far and sweep it left and right, and advance quickly until the flame is completely extinguished. 2) If the flammable liquid is burning in the container, it should be directed at the flame and shake it. When the flame is driven out of the container, the jet will follow the flame until the flame is completely extinguished. However, care should be taken not to spray the jet directly on the surface of the combustion fluid to prevent the fire-extinguishing agent from pushing the flammable liquid out of the container to expand the fire and cause difficulty in extinguishing the fire. 3) If the initial fire of a flammable solid substance is extinguished, the jet is directed at the place where the combustion is most violent. When the flame is extinguished, measures shall be taken to prevent it from resuming. 4. After the fire is extinguished, lift the fire extinguisher pressure knob and stop spraying. 5. When the fire extinguishing is used, the head should be upwards, and the inclination should not be too large. Do not use it upside down or flat.

Fourth, pay attention to the problem

1. When extinguishing with a fire extinguisher, avoid impinging on the liquid surface and splash it with fireproof seeds. 2. Once the fire extinguisher is opened, it cannot be reused. It must be re-inflated by the professional fire equipment management department before it can be used. 3, inspections should be stepped up to check whether the pressure meets the requirements, whether the nozzle damaged, the appearance of obvious corrosion. 4. In order to guarantee the normal use of fire extinguishers and personal safety, it is forbidden to use fire extinguishers for play and play; non-professionals are forbidden to open and disassemble fire extinguishers at will.

Fifth, maintenance

1. The environmental temperature of the fire extinguisher should be between -10 and +45 °C. It should be kept dry and ventilated to avoid sunlight exposure and strong radiant heat so as not to affect the normal use of the fire extinguisher. 2. Newly purchased fire extinguishers should be checked in the following order and checked once a month thereafter. (1) Check if the connections of the fire extinguisher are normal and firm. (2) Check if the pressure gauge pointer is within the work area (ie within the green area). (3) The configuration can be used after checking for no abnormality. (4) If the inspection is abnormal, please contact the factory or supplier for replacement. 3. Fire extinguisher inspections should be conducted by trained personnel. 4. If the pressure gauge pointer is found to be lower than the green area during periodic inspection, the driving gas (nitrogen) should be added in time. 5. The fire extinguishers supplementing the driving gas or maintenance should go to the professional maintenance department authorized by the fire monitoring agency. The maintenance conditions, procedures and quality should meet the requirements of GA95-2007 standard.