Gas cylinder refers to a movable pressure vessel with a bottle-shaped main body structure, which is generally filled with gas (compressed gas, liquefied gas, dissolved and adsorbed gas, etc.). Gas cylinders are widely used, both in the production field and in the field of life, almost inseparable from gas cylinders.

Gas cylinder is a kind of pressure equipment, with explosive danger, and its loading medium is generally flammable, explosive, toxic, strong corrosion and other properties, the use of the environment because of its movement, repeated filling, operating personnel are not fixed and the use of environmental changes, more complex than other pressure vessels, harsh. Once the gas cylinder is exploded or leaked, fire or poisoning often occur, and even lead to catastrophic accidents, resulting in serious property losses, casualties and environmental pollution.

To ensure the safe use of gas cylinders, in addition to requiring it to meet the general requirements of pressure vessels, there are also some special provisions and requirements.