1. When purchasing and using qualified products from enterprises with manufacturing licenses, refitted gas cylinders and gas cylinders that have not been tested longer may not be used.

    2. The cylinder user must purchase gas from a registered filling unit or a registered distribution unit.

    3. The cylinder shall be placed in the place where it is to be used. It shall not be close to heat source or open fire. Meanwhile, the cylinder body shall be kept dry. The nominal cylinder pressure is determined by taking into account the maximum temperature at which the gas in the cylinder is likely to reach under normal circumstances, with an appropriate safety margin. Therefore, abnormal situations must be prevented. The distance between combustible or combustion-supporting gas cylinders and open fire and the distance between two kinds of gas cylinders should not be less than 10 meters. Gas cylinders containing polymerization or decomposition reactions should avoid radiation, electromagnetic waves and vibration sources. If the above distance is difficult to reach, it can be shortened appropriately after taking reliable protective measures.

    4. When used in summer, gas cylinders should be protected from exposure to the sun, rain and water.

    5. When flammable or toxic gas cylinders are used, good ventilation should be ensured in the workshop.

    6. When using oxidizing gas cylinders, operators should carefully check whether their hands, gloves, tools, pressure-relief devices, bottle valves, etc., are contaminated with grease. If there is grease, it must be defatted and cleaned before operation. Due to the oil contact with compressed oxidizing gas, it can produce spontaneous combustion.

    7. When opening or closing the bottle valve (or the main globe valve at the top of the bus-exhaust line), it can only be done slowly by hand or a special wrench to prevent static electricity generated at high speed. Never use hammer, chisel, pipe clamp, wire clamp, long handle screw wrench and other tools to open and close, so as not to damage the valve or make the pressure gauge under impact and failure.

    8. When it is found that the cylinder valve has air leakage, or cannot be vented, or there are other defects, close the cylinder valve, mark the found defects on the bottle body with a mark that is not easy to fade, and then send it back to the gas filling unit for treatment.

    9. The gas in the bottle must not be used up, and there must be residual pressure. The residual pressure of permanent gas cylinder is not less than 0.05mpa; The liquefied gas cylinder shall be left with a residual gas of not less than 0.5~1.0% of the prescribed filling quantity; The residual gas pressure of the dissolved acetylene bottle is not less than 0.3MPa. Gas cylinder surplus pressure: one is to prevent backfilling, and the other is to  facilitate the gas filling unit inspection.

    10. After the cylinder is put into use, it shall not be mended or welded.

    11. After the gas cylinder is put into use, it is strictly prohibited to change the steel seal and color mark of the gas cylinder without permission, and refit the gas cylinder.

    The inspection period of each type of gas cylinder shall not exceed the following provisions:

    1. Cylinders containing corrosive gases (H2S, HC L, SO2, CO, etc.), diving cylinders and those in regular contact with sea water shall be inspected every two years.

    2. Cylinders containing general gases (N2, H2, O2, Air, CO2, CH4, etc.) shall be inspected every three years.

    3. Gas cylinders containing inert gas (He, Ar, etc.) shall be inspected every five years.

    4. LPG cylinders shall be tested once every four years for the first three times and shall be used for three years for the fourth time.

    5. Dissolved acetylene cylinders should be inspected every three years.