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There are two types of liquefaction tanks used by citizens. One is the screw connection between the cylinder shield and the bottle body, referred to as "screw bottle"; the other is the connection between the cylinder shield and the bottle body by electric welding, referred to as "welded bottle". ". According to national regulations, the safe use period of liquefied gas tanks is only 15 years, and regular inspections are required every 4 years. Since there is no permanent mark on the bottle body of the "screw bottle", since September 1996, the state has clearly stipulated that the "screw bottle" must not be reproduced. That is, the last batch of "screw bottles" produced is more than 15 years old and must be scrapped. The normal service life of liquefied gas tanks is generally 15 years. Within 12 years after leaving the factory, liquefied gas tanks must be tested every 4 years, and must be scrapped for more than 15 years. Of course, some cans that cannot be used for various reasons can not be used again. Don't put your family's safety due to your negligence.

A liquefied gas tank refers to a storage tank used to store liquefied gas. When there is liquefied gas inside, the pressure is very high, and a slight improper operation may cause an explosion. It is a special equipment. The product itself is made of steel and has a certain resistance to pressure. The maximum pressure of the liquefied gas cylinder is 2.1 MPa. The pressure of liquefied gas at 20 degrees Celsius is 0.8 MPa, and the pressure at 40 degrees Celsius can reach 1.59 MPa. If the volume of the liquefied gas remains the same, the pressure will increase by 0.04 MPa for every 1 degree Celsius increase in temperature, so each cylinder can only be filled with 85%, which is 14.5 kg. Do not use warm water to heat the cylinder when the tank is empty, otherwise it will cause a physical explosion. Therefore, liquefied gas tanks must use manufacturers with relevant manufacturing qualifications to produce or use qualified products GAS COMPOSITION First of all, what is gas? In chemistry, gas refers to a colorless and odorless mixture of methane-based gas generated from biological fossils. In daily life, gas does not specifically refer to a kind of gas, but a general term for several types of gas, which can be divided into three categories: liquefied petroleum gas, natural gas, and coal gas. Both liquefied petroleum gas and coal gas are made artificially. Natural gas is commonly known as natural gas. The gas we use daily is mainly liquefied petroleum gas and natural gas. It should be noted that the gas in what we usually call a "gas tank" is not coal gas, but liquefied petroleum gas. The main components of liquefied petroleum gas are propane and butane, which is a new type of fuel. The use of liquefied gas has the advantages of less pollution, high heat generation, easy transportation, simple storage, etc., so it has already entered the lives of the people. But it has a side effect, that is, if it leaks during use, it will be extremely harmful to the human body. Both liquefied petroleum gas and natural gas are colorless and odorless, but due to their flammable and explosive characteristics, for safety reasons, the gas supplied to households will be added with a chemical agent that resembles a "smelly" rotten egg. Ethyl mercaptan or today`s tetrahydrothiophene. Under outdoor conditions, since methane is lighter than air, once it leaks, methane will quickly dissipate, which helps reduce the risk of explosion to a certain extent.

1. The use and installation of compressed natural gas cylinders for automobiles should comply with the relevant standards, and should be refitted and repaired by a formal refitting factory with CNG auto refitting qualification issued by the province, including installation and disassembly of gas cylinders. It is strictly forbidden for unqualified units to modify, repair, disassemble and inspect the gas cylinders. Do not dig, repair, weld and repair the gas cylinders. The original manufacturing labels and nameplates of the gas cylinders should be complete, the content should be complete, and the steel seal should be clear; No permanent deformation, the bottle valve should be intact; 2. The safety status of the gas cylinder and its accessories should be checked before and after filling; the filled gas must undergo dehydration, desulfurization and light oil removal. .Overpressure filling is strictly prohibited, the natural gas in the bottle must not be used up, and a residual pressure of more than 0.1 MPa must be left; the working pressure of the gas cylinder is the limited filling pressure at the reference temperature (20℃), and the filling pressure of the gas cylinder should be Adjust according to the actual air temperature during inflation, and its temperature compensation value should be in accordance with the regulations of the inflatable station. The new gas cylinder should be vacuumed before the first inflation; 3. During the use of the cylinder, it is found that the amount of air added does not match the usual mileage, or if the pressure in the cylinder drops significantly after a period of exercise, you should be vigilant and check for leaks in time. When there is serious corrosion, damage or doubt about its safety, inspection should be carried out in time; 4. The composite material layer of the gas cylinder is strictly prohibited from scratches, bumps and acid corrosion. Isolating rubber pads should be used between the gas cylinder and the fastening band and the mounting bracket and should be well tightened. The worn and deformed rubber pads should be replaced in time . Take care to protect the winding layer of the wound cylinder, keep the surface clean, and prevent chemical corrosion; do not put hard objects in the trunk to avoid bumps or knocks on the surface of the cylinder. Do not place heavy objects on the gas system pipes; 5. It is forbidden to contact with grease, chemicals, hardware and other substances. Scratching, knocking, corrosion and squeezing are strictly prohibited. Gas cylinders must not be close to heat sources or exposed to sunlight. The distance from open flames should generally not be less than 10 meters, and gas cylinders must not be impacted. ; 6. The back box where the gas cylinder is located should be used as little as possible or not used with electrical components. If it must be used, it should also have explosion-proof performance and be installed as far away as possible from the gas cylinder. 7. Frequently check the leaky interfaces of the gas cylinder, the inflation valve and the pressure reducer; 8. When the valve of the gas cylinder is frozen, it is strictly forbidden to bake it with fire. It is strictly forbidden to heat the gas cylinder with a heat source exceeding 40℃; it is strictly forbidden to conduct arc welding on the gas cylinder; 9. Isolation rubber pads should be used between the gas cylinder and the fastening straps and mounting brackets and should be well tightened. The worn and deformed rubber pads should be replaced in time; 10. The following accidents should be inspected at any time: (1) Accidents and gas cylinders or vehicles catch fire, withstand impact, overheating or confirmed to be damaged by other means; (2) Damaged by chemicals; (3) The gas cylinder is overpressured or damaged by goods or vehicles; (4) Other abnormal conditions, natural gas smell (confirmed as a non-pipeline leak), unexplained gas pressure drop, abnormal sound, and signs of loose installation; (5) Cylinders that are in stock or out of service for more than one inspection period should be inspected before being used; (6) Other abnormal conditions occur. 11. The safety accessories of the gas cylinder are found to be malfunctioning during use, and malfunctions: cylinder valves, fusible alloy plugs, leaky cylinder valve switches fail, etc., first move the car to a safe place, set a warning line, and wait for the compressed natural gas to be released After it is finished, send it to the gas cylinder inspection unit or natural gas vehicle repair shop for treatment. It is strictly forbidden to repair and replace accessories by yourself.

CNG cylinders are high-pressure containers used to store compressed natural gas. This high-pressure container containing flammable and explosive gas is a pressure container with explosive danger. The gas storage pressure of the vehicle cylinder is 20MPa. CNG is the English abbreviation of Compressed Natural Gas, the English word for compressed natural gas. Compressed natural gas generally refers to gaseous natural gas (methane as the main component) that can be used as fuel for vehicle engines after multi-stage pressurization to about 20MPa. CNG cylinders are divided into four categories The first category is steel or aluminum alloy metal bottles (CNG-1); The second category is a composite gas cylinder (CNG-2) with steel or aluminum lining and a cylinder body reinforced with "hoop winding" resin impregnated long fibers; The third category is composite gas cylinders (CNG-3) reinforced with steel or aluminum lining and "wound wound" resin impregnated long fibers; The fourth category is composite gas cylinders (CNG-4) reinforced with plastic linings and "wrapped" resin-impregnated long fibers. Each of these types of gas cylinders has its own advantages and disadvantages, and can be selected and used according to different models. At present, steel gas cylinders are mainly used in my country, whose performance must meet the requirements of GB17258 "Compressed Natural Gas Cylinders for Automobiles". Generally, high-quality chromium-molybdenum steel is used as the material of the cylinder. A complete compressed natural gas cylinder for automobiles should have a bottle cap, a bottle valve and a safety relief device. The bottle cap can protect the bottle valve, and the type of safety relief device on the bottle valve should be a combination of bursting disc and fusible plug.

Acetylene gas cylinder refers to a special pressure vessel filled with filler for storing and transporting acetylene. The appearance is similar to the oxygen cylinder, the surface is painted white, and the words "acetylene" are written in red paint. The acetylene gas cylinder is equipped with porous filler immersed in acetone, so that the acetylene can be safely stored in the bottle. When in use, the acetylene dissolved in acetone becomes gas and separated out, while the acetone remains in the bottle so that it can be filled with acetylene again. Acetylene is a flammable and explosive substance, so the explosion-proof nature of acetylene gas cylinders should pay attention to: 1. Acetylene gas cylinders should be supplemented with acetone according to relevant regulations, and should not be excessive; 2. Determine the acetylene filling volume according to the acetone volume, strictly control the filling speed, and prohibit excessive filling; 3. Use qualified acetylene gas cylinders. Pay attention to: 1. The place where the acetylene bottle is placed shall not be close to heat sources and electrical equipment, and the distance from the open flame shall not be less than 10m; 2. Use upright; 3. It is strictly forbidden to place it in places with poor ventilation or radioactive ray sources; 4. It is strictly forbidden to knock, collide, arc off the bottle or place it on the insulator; 5. Exposure to the sun is strictly prohibited, and it is strictly forbidden to heat the bottle with a heat source above 40 degrees Celsius; 6. The acetylene cylinder and the oxygen cylinder are placed on the same trolley and separated by non-combustible materials; 7. Equipped with special pressure reducer and flashback preventer; it is strictly forbidden to open and close acetylene gas cylinders with ignited welding and cutting tools; 8. If the acetylene bottle leaks during use, deal with it in time; 9. Leave a residual pressure of 0.05MPa. The safe distance between the acetylene cylinder and the oxygen cylinder is 5 meters, and neither can be exposed to the sun. Acetylene leakage treatment method: dilution and dissolution with sprayed water. Build a dike or dig a pit to contain the large amount of waste water produced. If possible, send the leaked air to an open place with an exhaust fan or install an appropriate nozzle to burn it. Leaking containers should be properly handled and used after repair and inspection.

For the safety of you and your family, please do not use expired LPG cylinders.

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 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: 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 the 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 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 each 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. Its characteristic is that the fire extinguishing agent is filled below 500 grams, the pressure is below 0.8 MPa, and it is a small fire extinguisher that can be used for one-time use and cannot be refilled. According to the type of fire extinguishing agent, there are 1211 fire extinguishers, also called aerosol halogenated 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.

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. Manby was born in Norfolk. He served as the commander of the Yarmouth Barracks as a young man from the army, officer to captain. This idle position allowed him time to devote himself 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 chemicals, 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.

HOT SALE TYPE OXYGEN CYLIDNER FOR MEDICAL USE Nominal water capacity(L) 40L Nominal Diameter(mm) 219mm Nominal working pressure(bar) 150bar Test pressure(bar) 250bar Wall thickness(mm) 5.7mm Color Customer's request Valve Customer's request Weight 48kg(without valve or cap) Main purpose and scope of application: 1. Mental overdraft: Use when students are nervous in studying or taking exams (especially before high school entrance examination and college entrance examination), which can prevent dizziness and vomiting, asthma and chest tightness, mental fatigue, clear mind, focus, quick thinking, and improve memory. 2. High pressure at work: When white-collar workers are under high pressure at work for a long time, regular use can relieve nervous tension and moodiness, and maintain vigorous energy. 3. Sports: Used for physical exercise or competition to eliminate shortness of breath, asthma and chest tightness, and restore physical strength. 4. Long-term driving: long-term driving to inhale healthy oxygen will make you tired, refreshed, and ensure driving safety. 5. Air pollution: When the air pollution is serious or the air is blocked in meeting rooms, offices, living rooms and other places, the circulation is not smooth, the air is not good, regular oxygen can be used to clean the respiratory tract, replace the harmful gas in the lungs, and make energy more abundant. 6. Leisure tourism: use in various entertainment and leisure places such as karaoke, disco, Internet cafes, bars, sauna centers, etc., to enjoy fresh air anytime and anywhere; it can also be used to sober up after excessive tobacco and alcohol, and has the effect of hangover. It can also replenish the oxygen content in the body during travel, relieve fatigue and clear the mind.