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Fire Extinguisher (5)

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The fire extinguisher is a portable fire fighting tool. Put chemicals in the fire extinguisher to put out the fire. Fire extinguishers are one of the common fire prevention facilities. They are stored in public places or places where fires may occur. Different types of fire extinguishers have different ingredients and are designed for different fire causes. Attention must be paid to avoid adverse effects and dangers during use.
The world's first fire extinguisher was born in 1834. In London, a fire almost completely destroyed the ancient Palace of Westminster, where the British Parliament is located. Among the many fire watchers, there is one who is not idling to see the fire scene. He is George William Manby. [1]   [2] Manby was born in Norfolk. He served as the commander of the Yarmouth Barracks as a young man from the army to the officer to the captain. This idle position allowed him to devote time to the cause of saving human lives that strongly attracted him. Earlier, he was keen on shipwreck rescue. He invented the pants-shaped lifebuoy and was the first to propose the use of lighthouse flashes to identify signals. Later, Manby turned his genius from marine rescue to fire rescue. When a fire broke out, he was experimenting with fireproof clothing. His most remarkable and pioneering contribution was his invention of a portable compressed gas fire extinguisher, which is a copper cylinder two feet long, eight inches in diameter and four gallons in capacity, which is basically the same as today's fire extinguishers. He put the fire extinguisher in his specially designed trolley. He hoped that a patrol team equipped with such a fire extinguisher would immediately extinguish the first small fire at the fire site, thereby reducing the number of major fires.
Fire extinguishing equipment is a kind of fire-fighting must-haves that are often ignored by people and show their skills when they are urgently needed. Especially in the high-rise buildings, the interior is decorated with a lot of wood, plastic, and fabrics. Once there is a fire, without proper fire extinguishing equipment, it may cause catastrophe.
The ancient fire extinguishers were very simple, nothing more than hooks, axes, shovels, buckets and the like. The first real special fire extinguisher was invented by the British captain and Norfolk Manby in 1816. It was just one or two drums filled with more than 1 liter of water and filled with compressed air.
By the middle of the 19th century, French physician Gallier had invented a portable chemical fire extinguisher. Mix the sodium bicarbonate and water in the barrel, and place a glass bottle with sulfuric acid in the barrel mouth. When in use, the firing pin pierces the bottle to mix the chemical substances, produce carbon dioxide, and press the water out of the barrel.
In 1905, Professor Laurent of Russia invented a foam fire extinguishing agent in St. Petersburg, mixing aluminum sulfate with sodium bicarbonate solution and adding a stabilizer. After spraying, a foam containing carbon dioxide is formed, which floats in burning oil, paint or gasoline. It can effectively cut off oxygen and suffocate the flame.
In 1909, Davidson of New York obtained a patent for using carbon dioxide to press out carbon tetrachloride from a fire extinguisher. This liquid would immediately become a non-flammable heavier gas to smother the flame. Since then, a variety of small fire extinguishers such as dry powder fire extinguishers and liquid carbon dioxide fire extinguishers have appeared.
There are many types of fire extinguishers. According to their moving methods, they can be divided into: portable and cart type; according to the power source of driving the fire extinguishing agent, they can be divided into: gas cylinder type, pressure storage type, chemical reaction type; according to the fire extinguishing filled The agent can be further divided into: foam, dry powder, halogenated alkane, carbon dioxide, water and so on.

Dry powder fire extinguisher:

Principle: The dry powder fire extinguisher is filled with dry powder fire extinguishing agent. Dry powder fire extinguishing agent is a dry and easy-to-flow fine powder used for fire extinguishing. It is composed of inorganic salt with fire extinguishing effect and a small amount of additives through drying, crushing and mixing to form a fine solid powder. Use compressed carbon dioxide to blow out dry powder (mainly containing sodium bicarbonate) to extinguish the fire.
Structure: The dry powder fire extinguisher uses carbon dioxide gas or nitrogen gas as power to spray the dry powder in the bottle to extinguish the fire. Dry powder is a kind of dry, easy-to-flow fine solid powder, which is composed of a base material capable of extinguishing fire and additives such as moisture-proof agent, flow promoter, and anti-caking agent.
Foam fire extinguisher
Principle: There are two containers in the foam fire extinguisher, which respectively hold two liquids. They are aluminum sulfate and sodium bicarbonate solutions. The two solutions do not touch each other and do not cause any chemical reaction. (Never touch the foam fire extinguisher at ordinary times) When a foam fire extinguisher is needed, turn the fire extinguisher upside down. If the two solutions are mixed together, a large amount of carbon dioxide gas will be produced:
Principle of Foam Fire Extinguisher
Principle of Foam Fire Extinguisher
In addition to the two reactants, some foaming agents are added to the fire extinguisher. When the switch is turned on, the foam is sprayed from the fire extinguisher, covering the burning material, isolating the burning material from the air, and reducing the temperature to achieve the purpose of extinguishing the fire.
Structure: The acid-base fire extinguisher is composed of a cylinder, a cap, a sulfuric acid bottle, and a nozzle. The cylinder is filled with sodium bicarbonate aqueous solution, and the sulfuric acid bottle is filled with concentrated sulfuric acid. There is a lead stopper at the mouth of the bottle, which is used to seal the mouth of the bottle to prevent the concentrated sulfuric acid in the bottle from being diluted by water or mixing with the liquid medicine outside the bottle. The working principle of the acid-base fire extinguisher is to use two kinds of agents to mix and produce a chemical reaction to generate pressure to spray out the agent, thereby extinguishing the fire.

Carbon dioxide fire extinguisher:
Principle: Liquid carbon dioxide is stored in the fire extinguisher bottle. When it is working, when the pressure of the bottle valve is pressed down. The internal carbon dioxide fire extinguishing agent is sprayed from the siphon tube through the bottle valve to the nozzle, so that the concentration of oxygen in the combustion zone drops rapidly. When the carbon dioxide reaches a sufficient concentration, the flame will suffocate and extinguish. At the same time, the liquid carbon dioxide will quickly vaporize. It absorbs a lot of heat within a period of time, so it has a certain cooling effect on the burning material and also helps to extinguish the fire. The cart-type carbon dioxide fire extinguisher is mainly composed of several parts such as the bottle body, the head assembly, the nozzle assembly, and the frame assembly. The built-in fire extinguishing agent is liquid carbon dioxide fire extinguishing agent.
Structure: The barrel of the carbon dioxide fire extinguisher is made of high-quality alloy steel through a special process, and its weight is reduced by 40% compared to carbon steel. It has the characteristics of convenient operation, safe and reliable, easy to store, light and beautiful.
Applicable occasions: It is suitable for putting out the first fire of flammable liquid and gas, and also for putting out the fire of live equipment. It is often used in laboratories, computer rooms, substations, and places with high maintenance requirements for precision electronic instruments, valuable equipment or items.

Water fire extinguisher
Water-based fire extinguisher:

The fire extinguishing agent in the clear water fire extinguisher is clear water. Water has lower viscosity, higher thermal stability, higher density and higher surface tension at room temperature. It is an ancient and widely used natural fire extinguishing agent, easy to obtain and store.
It mainly relies on cooling and suffocation to extinguish fires. Because every kilogram of water is heated from room temperature to the boiling point and completely vaporized, it can absorb 2593.4KJ of heat. Therefore, it uses its own ability to absorb sensible and latent heat to play a cooling and extinguishing effect, which is unmatched by other fire extinguishing agents. In addition, the water vapor formed after the water is vaporized is an inert gas, and the volume will expand by about 1700 times.
When extinguishing a fire, the water vapor generated by water vaporization will occupy the space of the combustion zone, dilute the oxygen content around the combustion material, prevent fresh air from entering the combustion zone, and greatly reduce the oxygen concentration in the combustion zone, so as to achieve the purpose of suffocating and extinguishing. When the water is in the form of spray mist, the specific surface area of the formed water droplets and mist droplets will greatly increase, enhancing the heat exchange between water and fire, thereby enhancing its cooling and asphyxiating effects.
In addition, it can also dilute some combustible and flammable liquids that are soluble in water; the water mist produced by strong jets can emulsify the combustible and flammable liquids, so that the surface of the liquid can be rapidly cooled, and the rate of flammable vapor generation can be reduced. To achieve the purpose of extinguishing fire.
Simple fire extinguisher
Simple fire extinguisher is a portable fire extinguisher developed in recent years. It is characterized by a small fire extinguisher with a filling amount of less than 500 grams and a pressure of less than 0.8 MPa, and it is a one-time use and cannot be refilled.
According to the type of fire extinguishing agent charged, there are 1211 fire extinguishers, also called aerosol halide fire extinguishers; simple dry powder fire extinguishers, also called portable dry powder fire extinguishers; and simple air foam fire extinguishers, also called portable air foam Fire extinguisher. Simple fire extinguishers are suitable for home use. Simple 1211 fire extinguishers and simple dry powder fire extinguishers can put out first-time fires in LPG stoves and upper angle valves of steel cylinders, or gas stoves, and can also put out solids such as hot pot fires and waste paper baskets. A fire that burns combustible materials. Simple air foam is suitable for initial fires caused by oil pans, kerosene stoves, oil lamps and candles, and can also extinguish solid combustible fires.
Simple fire extinguishers are more suitable for standing homes, which is convenient for extinguishing sudden fire situations.

Instructions:

Dry powder fire extinguisher
Scope of application: Sodium bicarbonate dry powder fire extinguishers are suitable for initial fires of flammable, combustible liquids, gases and live equipment; ammonium phosphate dry powder fire extinguishers can be used for the above-mentioned types of fires, and can also extinguish initial fires of solid substances. But none of them can put out a metal burning fire.
Dry powder fire extinguishers should aim at the main part of the flame when fighting flammable and flammable liquid fires. If the liquid fire to be extinguished is flowing and burning, aim at the root of the flame from near and far, and sweep from left to right until the flame is completely extinguished. If combustible liquid burns in the container, the user should aim at the root of the flame and sway from side to side so that the jet of dry powder covers the entire surface of the container opening; when the flame is driven out of the container, the user should continue to spray until the flame is completely extinguished . When extinguishing a flammable liquid fire in a container, care should be taken not to directly aim the nozzle at the liquid surface to prevent the impact of the jet from splashing the flammable liquid and expanding the fire, causing difficulty in extinguishing the fire. If the flammable liquid has been burned in a metal container for too long and the wall temperature of the container is higher than the spontaneous ignition point of the flammable liquid, it is very easy to cause the phenomenon of re-ignition after the fire is extinguished. If combined with a foam fire extinguisher, the fire will be extinguished The effect is better.
How to use: When putting out the fire, you can quickly rush to the fire site with your hand or shoulder-mounted fire extinguisher. Put down the fire extinguisher about 5 meters away from the burning place. If you are outdoors, you should choose to spray in the upwind direction. If the dry powder fire extinguisher used is an external pressure storage type, the operator should hold the spray gun firmly in one hand and lift the opening lifting ring on the gas cylinder with the other hand. If the opening of the gas cylinder is hand-wheeled, unscrew it counterclockwise and rotate it to the highest position, then lift the fire extinguisher. When the dry powder is sprayed out, quickly aim at the root of the flame and shoot. If the dry powder fire extinguisher used is a built-in gas storage cylinder or a pressure storage type, the operator should first remove the safety pin on the opening handle, then hold the nozzle at the front end of the spray hose, and open the pressure handle with the other hand Press down and turn on the fire extinguisher to extinguish the fire. When using a fire extinguisher with a spray hose or a stored pressure fire extinguisher, always press down the handle with one hand and cannot let go, otherwise the spray will be interrupted.
Use attention: When using ammonium phosphate dry powder fire extinguisher to put out a solid combustible fire, it should be aimed at the most violent burning place, and shoot up and down, left and right. If conditions permit, the user can carry the fire extinguisher and spray along the circumference of the burning material, so that the dry powder extinguishing agent is sprayed evenly on the surface of the burning material until the flame is completely extinguished.
The use of cart-type dry powder fire extinguishers is the same as that of portable dry powder fire extinguishers.
Foam fire extinguisher
Scope of application: It is suitable for fighting general B fires, such as oil products, grease and other fires, and can also be applied to A fires, but cannot fight water-soluble flammable and flammable liquid fires in B fires, such as alcohol, ester, etc. Ether, ketone and other substance fires; also can not put out live equipment and class C and D fires.
Hand-held method of use: You can carry the lifting ring on the upper part of the barrel and go to the fire quickly. At this time, care should be taken not to tilt the fire extinguisher excessively, let alone hold it horizontally or upside down, so as to prevent the two agents from mixing and spraying out in advance. When the distance from the ignition point is about 10 meters, the cylinder can be turned upside down, one hand grips the lifting ring tightly, and the other hand holds the bottom ring of the cylinder, aiming the jet at the burning material. When fighting a flammable liquid fire, if it burns in a flowing state, spray the foam from far to near to completely cover the surface of the burning liquid; if it burns in a container, shoot the foam toward the inner wall of the container to make the foam Flowing along the inner wall, gradually covering the surface of the fire liquid. Never directly aim at the liquid surface to spray, so as to avoid the impact of the jet, the burning liquid will be scattered or flushed out of the container to expand the burning range. When fighting a solid material fire, the jet should be aimed at the most violent burning place. With the shortening of the effective spraying distance when extinguishing the fire, the user should gradually approach the burning area and always spray foam on the burning material until it is extinguished. When in use, the fire extinguisher should always be kept upside down, otherwise the spray will be interrupted.
Portable foam fire extinguishers should be stored in a dry, cool, well-ventilated place that is easy to access, and should not be near high temperature or places that may be exposed to the sun to prevent carbonic acid decomposition and failure; antifreeze measures should be taken in winter to prevent freezing; and should be frequently wiped Remove dust and dredge the nozzle to keep it unobstructed.
Trolley foam fire extinguisher
Its adaptability to fire is the same as the portable chemical foam fire extinguisher.
Cart-style usage: When using it, it is usually operated by two people. The fire extinguisher is quickly pushed and pulled to the fire site, and it is stopped at a distance of about 10 meters from the fire point. After one person releases the spray hose, hold the spray gun firmly with both hands and aim at the burning place. ; The other is to turn the hand wheel counterclockwise to raise the screw to the highest position to open the bottle cap, then tilt the barrel backwards, make the lever touch the ground, and rotate the valve handle 90 degrees to spray foam Put out the fire. If the valve is installed at the spray gun, the person responsible for operating the spray gun opens the valve.
The trolley foam fire extinguisher adapts to fire and uses the same method as the portable chemical foam fire extinguisher.
Carbon dioxide fire extinguisher

Scope of application: Carbon dioxide fire extinguishers are mainly used to extinguish the initial fires of valuable equipment, archives, instruments, electrical equipment below 600 volts, and oil. When in use, first lift the fire extinguisher to the fire location, put down the fire extinguisher, pull out the safety pin, hold the handle at the root of the horn with one hand, and hold the handle of the opening and closing valve tightly with the other hand. For carbon dioxide fire extinguishers without spray hoses, the horn should be raised 70-90 degrees. When in use, you cannot directly grasp the outer wall of the horn or the metal connecting pipe with your hands to prevent your hands from being frostbited. When using a carbon dioxide fire extinguisher, if it is used outdoors, it should be sprayed in the windward direction; if it is used in a small indoor space, the operator should leave quickly after the fire is extinguished to prevent suffocation.

Carbon dioxide fire extinguisher
Scope of application: Carbon dioxide fire extinguishers are mainly used to extinguish the initial fires of valuable equipment, archives, instruments, electrical equipment below 600 volts, and oil. When in use, first lift the fire extinguisher to the fire location, put down the fire extinguisher, pull out the safety pin, hold the handle at the root of the horn with one hand, and hold the handle of the opening and closing valve tightly with the other hand. For carbon dioxide fire extinguishers without spray hoses, the horn should be raised 70-90 degrees. When in use, you cannot directly grasp the outer wall of the horn or the metal connecting pipe with your hands to prevent your hands from being frostbited. When using a carbon dioxide fire extinguisher, if it is used outdoors, it should be sprayed in the windward direction; if it is used in a small indoor space, the operator should leave quickly after the fire is extinguished to prevent suffocation.
Carbon dioxide fire extinguisher
Carbon dioxide fire extinguisher
How to use: When extinguishing a fire, just lift or carry the fire extinguisher to the fire site. At about 5 meters away from the burning material, pull out the safety pin of the fire extinguisher, hold the handle at the root of the horn with one hand, and hold the handle of the opening and closing valve tightly with the other hand . For carbon dioxide fire extinguishers without spray hoses, the horn should be raised 70-90 degrees. When in use, do not directly grasp the outer wall of the loudspeaker or the metal connecting pipe to prevent frostbite. When extinguishing a fire, when the combustible liquid burns in a flowing state, the user sprays the jet of carbon dioxide fire extinguishing agent from near to far to the flame. If flammable liquid burns in the container, the user should lift the horn. Spray from the upper side of the container into the burning container. However, the carbon dioxide jet cannot directly impact the combustible liquid surface to prevent the combustible liquid from being flushed out of the container to expand the fire and cause difficulty in extinguishing the fire.
Note: When using a carbon dioxide fire extinguisher, if you use it outdoors, you should choose to spray in the upwind direction and place your hands on the wooden handle of the cylinder to prevent frostbite. If it is used in a small indoor space, the operator should leave quickly after the fire is extinguished to prevent suffocation. [1]
Others: The cart-type carbon dioxide fire extinguisher is generally operated by two people. When using them, they push or pull the fire extinguisher to the burning place, and stop about 10 meters away from the burning material. After one person quickly removes the horn and deploys the spray hose, Holding the handle at the root of the loudspeaker, another person quickly rotates the handwheel in a counterclockwise direction and drives it to the maximum position. The fire fighting method is the same as the portable method.
Simple fire extinguisher
How to use one
Trolley type fire extinguisher
Trolley type fire extinguisher
Portable: When using, the handle of the portable fire extinguisher or the shoulder fire extinguisher should be brought to the fire scene. Put down the fire extinguisher about 5 meters away from the burning place, first pull out the safety pin, hold the opening handle with one hand, and hold the nozzle at the front end of the spray hose with the other hand. If the fire extinguisher does not have a spray hose, hold the opening lever with one hand and the bottom ring part at the bottom of the fire extinguisher with the other hand. First point the nozzle at the burning place, and firmly grasp the opening handle to make the fire extinguisher spray. When the extinguished combustible liquid is burning in a flowing manner, the user should aim at the root of the flame from near and far, and shoot from left to right, and move forward quickly until the flame is completely extinguished. If combustible liquid burns in the container, it should be aimed at the flame and shake it left and right. When the flame is driven out of the container, the jet will follow the flame and shoot until the flame is completely extinguished. However, it should be noted that the jet cannot be directly sprayed on the surface of the combustion liquid to prevent the extinguishing agent from rushing the combustible liquid out of the container and expanding the fire, causing difficulty in extinguishing the fire. If the first fire of combustible solid materials is extinguished, the jet should be directed at the most violent burning place. When the flame is extinguished, measures should be taken in time to prevent it from re-igniting. When using the 1211 fire extinguisher, it cannot be turned upside down or lying down, otherwise the fire extinguishing agent will not spray out. In addition, when used outdoors, you should choose to spray in the upwind direction; when extinguishing a fire in a narrow room, the operator should evacuate quickly after the fire is extinguished, because the 1211 fire extinguishing agent is also toxic to prevent harm to the human body.
How to use two
Push-cart type: There are usually two operations when extinguishing a fire. First push or pull the fire extinguisher to the fire site and stop about 10 meters away from the burning place. One person quickly releases the spray hose, holds the spray gun firmly, and aims at the burning place; the other Then quickly open the fire extinguisher valve. The fire extinguishing method is the same as the portable 1211 fire extinguisher.
Fire fighting methods
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Cooling method
The principle of this fire extinguishing method is to spray the fire extinguishing agent directly on the burning object to reduce the temperature of combustion below the ignition point and stop the combustion. Or spray the fire extinguishing agent on the material near the fire source, so that it will not form a new fire point due to the heat radiation of the flame. The cooling fire extinguishing method is one of the main methods of fire extinguishing, and water and carbon dioxide are commonly used as fire extinguishing agents to cool down and extinguish the fire. The fire extinguishing agent does not participate in the chemical reaction in the combustion process during the fire extinguishing process. This method is a physical fire extinguishing method.
Isolation method
The isolation fire extinguishing method is to isolate or remove the burning material from the surrounding unburned combustible material, interrupt the supply of combustible material, and stop the combustion due to lack of combustible material. The specific methods are:
1. Remove combustible, combustible, explosive and combustion-supporting materials near the fire source;
2. Close the valves of combustible gas and liquid pipelines to reduce and prevent combustible substances from entering the combustion zone;
3. Try to block the scattered flammable and combustible liquids;
4. Demolition of flammable buildings adjacent to the fire source to form a space zone to prevent the spread of fire.
Asphyxiation
The suffocation fire extinguishing method is a fire extinguishing method that prevents the air from flowing into the combustion zone or uses the incombustible zone or dilutes the air with incombustible substances, so that the burning substance cannot get enough oxygen and extinguishes. The specific method is:
1. Cover the burning material with incombustible or non-combustible substances such as sand, cement, wet sack, wet quilt;
2. Spraying water spray, dry powder, foam and other fire extinguishing agents to cover the burning material;
3. Fill containers and equipment in fire with water vapor, nitrogen, carbon dioxide and other inert gases;
4. Airtight fire buildings, equipment and holes;
5. Spray non-combustible gas or non-combustible liquid (such as carbon dioxide, nitrogen, carbon tetrachloride, etc.) into the combustion area or on the combustion material. [2]
Precautions
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System specification content inspection content
1. During the transportation and storage of the fire extinguisher, avoid placing it upside down, rain, sun exposure, strong radiation and contact with corrosive substances.
2. The storage environment temperature of the fire extinguisher should be in the range of -10-45℃.
3. The place where the fire extinguisher is placed should be kept dry and ventilated to prevent the cylinder from being corroded by moisture. Sun exposure and strong radiant heat should be avoided, so as not to affect the normal use of the fire extinguisher.
4. The fire extinguisher shall be inspected regularly according to the requirements and inspection period specified by the manufacturer. Inspection content of fire extinguisher:

    The outer surface of the fire extinguisher pressure gauge must not have defects such as deformation or damage, otherwise the pressure gauge should be replaced;
    Whether the pointer of the pressure gauge is in the green zone (the green zone is the design working pressure value), otherwise it should be filled with driving gas;
    Whether the fire extinguisher nozzle has defects such as deformation, cracking, damage, etc., otherwise it should be replaced;
    Metal parts such as the handle and valve body of the fire extinguisher must not have serious damage, deformation, rust and other defects that affect the use, otherwise they must be replaced;
    If the cylinder body is severely deformed, the cylinder body is severely rusted (the paint is peeled off in a large area, and the rust area is greater than or equal to one-third of the total area of the cylinder body), or the connection parts and the bottom of the cylinder are seriously rusted, they must be scrapped;
    The rubber and plastic parts of the fire extinguisher must not be deformed, discolored, aged or broken, otherwise they must be replaced;
    Hand-held carbon dioxide fire extinguishers must use pressure-handle valves;
    For fire extinguishers with a fire extinguishing dose greater than or equal to 4kg, the gap spray mechanism should be replaced or the spray gun should be added. Those that cannot be replaced shall be scrapped;
    The unreasonable structure (such as the dry powder fire extinguisher with flat bottom of the cylinder, external gas storage cylinder, and air intake pipe from the barrel into the inside of the barrel) must be scrapped;
    Simple fire extinguishers shall not be refilled for maintenance. Simple fire extinguisher refers to a storage pressure fire extinguisher with a filling volume of less than 1kg and which can be opened by one finger and cannot be refilled.
    Take one fire extinguisher from the same batch of fire extinguishers for fire extinguishing performance test. ABC (ammonium phosphate) dry powder is usually light yellow, and the sprayed powder is fine and free of impurities. After the sprayed powder is fully heated, there will be less residue;

5. Once the fire extinguisher is turned on, it must be refilled according to the regulations even if there is not much ejection. The refilling should be carried out by the professional maintenance department in accordance with the requirements and methods specified by the manufacturer. The type, weight and drive of the fire extinguishing agent must not be changed randomly. gas pressure.
6. If the fire extinguisher is found to have problems after functional inspection, it must be repaired by a qualified repair unit, the damaged parts, the cylinder body, the water pressure test, and the fire extinguishing agent and driving gas must be refilled. The maintenance unit must strictly implement the fire extinguisher scrapping system. The fire extinguisher shall be subjected to a hydraulic test on its main pressure-bearing parts, such as the head and barrel, every five years and before each refilling, and only those qualified can continue to use it. After the test, it should be dried in time, and the inner wall should be inspected, and there should be no obvious rust. If the water pressure test is unqualified, welding and other methods are not allowed to repair and use.
7. Fire extinguishers repaired by the maintenance department should have a mark approved by the fire supervision department, and be marked with the name of the maintenance organization and the maintenance date.
8. Regardless of whether the fire extinguisher has been used or not, it shall be counted from the date of production (each fire extinguisher has a production date on the barrel) and must be sent to the maintenance unit for repair after reaching the prescribed maintenance period. Discarded, the fire extinguisher whose cylinder body fails the hydraulic pressure test during repair must also be discarded.
9. The management office must strengthen the daily management and maintenance of fire extinguishers. It is necessary to establish a "fire extinguisher account", register the type, number of configurations, setting positions and persons responsible for maintenance and management; clarify the responsibilities of the persons responsible for maintenance and management.
10. The management office shall inspect the maintenance of fire extinguishers at least quarterly. The inspection contents include: the implementation of the maintenance responsibilities of the responsible person, whether the pressure value of the fire extinguisher is within the normal pressure range, whether the insurance pin and lead seal are intact, and the fire extinguisher cannot be used for it. The fire extinguisher box should not be locked to avoid sunlight exposure and strong radiant heat, whether the fire extinguisher is within the validity period, etc., and make a "fire extinguisher inspection record" for checking the effective status of the fire extinguisher, and archive it for convenience. Verify.Fire Extinguisher


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