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1 Inspection 1. It is necessary to rent or purchase gas cylinders from enterprises that hold a manufacturing license issued by the General Administration of Quality Supervision, Inspection and Quarantine, and to have the gases filled at units that possess a Gas Cylinder Filling License issued by the provincial quality supervision department. Cylinders that have not been inspected or have failed inspection must not be rented or purchased. 2. Whether the appearance color, markings, and color rings comply with the provisions of **GB7144 \"Color Marking for Gas Cylinders\", whether they match the information provided by the manufacturer, and whether all components are intact and undamaged. 3. Check the steel stamp on the shoulder of the gas cylinder; pay attention to whether the production date of the cylinder falls within its valid usage period ； Check whether the inspection stamp and markings on the gas cylinder are within the permitted period for use after inspection. 4. Do the filled gas cylinders come with a product certificate and clear warning labels? 5. During use, if corrosion, damage is detected on the gas cylinder, or if its reliability is in doubt, it should be inspected in advance. 6. Cylinders that have been in stock or out of use for longer than the inspection period must be inspected by a qualified institution before being put back into use. 7. Test for air leaks using the specified method. It can be coated with soapy solution for inspection, and it can be used only after it is confirmed to be airtight. 2 Use and Storage 1. All types of gas cylinders must be equipped with corresponding dedicated pressure regulators. When opening the cylinder, the operator should stand to the side and behind the valve outlet, moving slowly. After confirming that the pressure regulator is in the closed position (with the T-shaped adjustment screw loose), turn the main valve of the cylinder counterclockwise, then check the reading on the high-pressure gauge. Next, turn the small switch located to the left of the pressure regulator counterclockwise, and then slowly turn the adjustment screw of the pressure regulator clockwise to compress the main spring and open the valve. Adjust the pressure on the pressure gauge to the desired level, and record the pressure value shown on the gauge. 2. When using flammable working gases such as hydrogen, it is necessary to ensure that their purity is below the explosive limit. Before use, the air in the equipment must be purged with working gas, and the purity of the working gas at the equipment’s outlet must be checked; only after meeting the requirements can the equipment be ignited and turned on. After the equipment is turned off, it is still necessary to continue filling it with working gas or nitrogen until it cools down to room temperature, in order to prevent explosions caused by residual working gas remaining inside the equipment. During operation, the flame must be kept burning; if it goes out, the gas cylinder and equipment should be turned off immediately, doors and windows should be opened for ventilation, and nitrogen should be introduced to displace any remaining gas in the equipment and prevent explosions. 3. In applications involving flammable working gases such as hydrogen, as well as those where backflow could occur, devices to prevent backflow must be installed, such as check valves, non-return valves, and buffer tanks. 4. The gas in the cylinder must not be used up completely; there must be some remaining pressure or mass. For permanent gases (those with a critical temperature of less than -10°C), the remaining pressure in the cylinder should be at least 0.05 Mpa (gauge pressure). For liquefied gas cylinders, at least 0.5% or 1.0% of the specified filling volume of gas should remain. 5. When a valve or pressure relief valve leaks, it must not be used any further; when a valve is damaged, it is strictly prohibited to replace it while there is pressure in the cylinder. 6. Gas cylinders should be placed neatly with their caps on, and hitting or knocking them is prohibited; they must be secured using cylinder stands and other devices to prevent tipping, and must not be placed horizontally ； Gas cylinders must not be placed near heat sources; they should not be stored together with flammable, explosive, toxic or other hazardous chemicals, and must also be kept away from various radiation sources. The distance between gas cylinders containing flammable gases such as hydrogen and open flames or ordinary electrical equipment should be at least 10 meters ； The distance from air inlets such as air conditioning units, air compressors, and ventilation equipment should not be less than 20 meters ； The distance from other locations where flammable gases are stored should be no less than 20 meters. 7. Empty bottles and full bottles should be stored separately, with clear distinguishing marks. Gases in different cylinders that can cause combustion, explosion, or the production of toxic substances when they come into contact with each other should be stored and used in separate compartments, with gas protection equipment and fire extinguishing devices available in the vicinity. 8. The quantity stored should be such that it does not interfere with operations, so store as little as possible; cylinders that are not suitable for storage indoors should be moved to a dedicated warehouse. 9. There shall be no open trenches or hidden passages inside the room, and open flames (including electric sparks) are strictly prohibited. The interior should be equipped with explosion-proof lighting and ventilation systems, kept dry, and protected from direct sunlight and rain exposure. 10. The indoor area must be well-ventilated to ensure that the concentration of flammable gases such as hydrogen in the air is well below the lower limit of their explosive limit. 3. Handling 1. Before handling gas cylinders, the operator must know the name and properties of the gas contained within them, as well as the precautions for handling them, and must have the appropriate tools and protective equipment ready. 2. Check that the labels on all components of the cylinder being moved are intact, close the valves tightly, and ensure there are no leaks. 3. Install shock-absorbing washers, tighten the safety cap, and transport it using a specialized stretcher or trolley designed for gas cylinders; it is strictly prohibited to use forklifts, dump trucks, or loaders for transportation. It must not be mixed or transported together with chemicals. 4. When loading and unloading gas cylinders, handle them gently; throwing, sliding, dropping, rolling, or bumping them is prohibited to avoid accidents caused by rough handling. 5. After loading, it should be secured using appropriate methods to prevent rolling or collision during transport. 6. It is prohibited to carry gas cylinders by handling their control valves.