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Dry Powder Fire Extinguisher: An All-Round Expert and Safety Guardian in Fire Prevention and Control
Contents
1. What are the types and working principles of dry powder fire extinguishers?
2. What occasions can different types of fire extinguishers be used for?
3. What fires can't chemical fire extinguishers be used on?
4 How to use dry powder fire extinguishers correctly?
5. How to clean up the fire extinguisher after use?
6. How to store the fire extinguisher?
7. Conclusion
1. What are the types and working principles of dry powder fire extinguishers?
Dry powder fire extinguishers are also called ABC dry powder fire extinguishers, which are divided into standard and special types.
1. The main component of standard fire extinguishers is ammonium phosphate. Ammonium phosphate has multiple mechanisms of action in the fire extinguishing process. First, it will produce non-combustible gases such as ammonia when it is decomposed by heat. These gases can dilute the oxygen concentration in the combustion area, making it difficult for the combustion reaction to continue. Secondly, the decomposed phosphate components can react with free radicals in the combustion process, thereby interrupting the chain reaction of combustion and achieving the purpose of fire extinguishing. Standard dry powder fire extinguishers are widely used and can extinguish almost all types of fires. However, it is not recommended to use them in closed spaces.
2. Special fire extinguishers include Class D and Class E. Among them, the main components of Class D are special powders such as sodium chloride-based and graphite-based. Sodium chloride-based fire extinguishing agents are more effective for some alkali metal fires. It can react with burning metals to form a relatively stable covering layer. Graphite-based fire extinguishing agents mainly isolate metals from air through their good covering properties. Class E is usually a specially treated dry powder that has good insulating properties to keep users safe when extinguishing electrical fires. These extinguishing agents do not conduct electricity and can quickly absorb heat to suppress the burning of electrical equipment.
2. What occasions can different types of fire extinguishers be used for?
Standard dry powder fire extinguisher
Special dry powder fire extinguishers
Specific M28 fire extinguishers can be used for fires of flammable metals.
Specific L2 fire extinguishers can be used for fires of lithium metal.
3. What fires can't chemical fire extinguishers be used on?
Class D fires: involving active metals, such as metal processing plants.
Selection recommendation
Technical Support
Class F fires: burning of cooking fats and oils, such as fryer fires.
Selection recommendation
Technical
4. How to use a dry powder fire extinguisher correctly?
1. Pull out: Remove the safety pin so that the fire extinguisher can be used normally.
2. Hold: Hold the nozzle and aim low (be careful not to hit the horn of the fire extinguisher, which will cause low temperature damage).
3. Press: Press down the handle to spray out the fire extinguishing agent to extinguish the fire.
4.Sweep: Sweep from the bottom of the fire until it is extinguished
5. How to clean the fire extinguisher after use?
1. Ventilate and clean the dry powder with a broom, dustpan, cleaning brush or industrial vacuum cleaner.
2. Turn off the power of the appliance and wipe it with a soft cloth; after shaking off the dry powder on the clothes, wipe or wash them with a damp cloth.
3. Put all the cleaned powder into a bag and seal it, and discard it in a regular trash can.
6. How to store the fire extinguisher?
1. Place it in a dry, ventilated, cool and convenient place, avoid direct sunlight, high temperature and humid environment, and prevent the shell and internal parts of the fire extinguisher from rusting, corrosion or damage.
2. Check the pressure of the fire extinguisher regularly to see if it is normal, and the pointer should be in the green area. Check whether the cylinder is deformed or rusted, whether it is within the validity period, etc. Generally, an appearance inspection is performed once a month, and a pressure inspection and comprehensive maintenance are performed once a year.
3. For the dry powder fire extinguisher we are talking about, the cylinder should be protected from vibration and collision to prevent the dry powder from agglomerating. If it is a carbon dioxide fire extinguisher, it is necessary to prevent overpressure. In the summer, special attention should be paid to the storage environment temperature. Appropriate cooling measures can be taken, such as placing it in an air-conditioned room or an insulated cabinet.
7. Conclusion
As a key equipment in the field of fire protection, fire extinguishers are of various types, each with its own characteristics and scope of application. It is extremely important to understand the types and principles of dry powder fire extinguishers, the application occasions of different types of fire extinguishers, the types of fires that cannot be used, the correct use methods, and the key points of cleaning and storage after use, so that you can take quick and accurate actions when a fire occurs to reduce the loss of life and property caused by the fire.
