Gas storage tank refers to the equipment specially used to store gas and plays the role of stabilizing system pressure. According to the pressure of the gas storage tank, it can be divided into high-pressure gas storage tank, low-pressure gas storage tank and atmospheric pressure storage tank. Gas storage tanks are divided into carbon steel gas storage tanks, low alloy steel gas storage tanks, stainless steel gas storage tanks. Gas storage tank (pressure vessel) is generally composed of cylinder body, head, flange, pipe, sealing element and bearing parts and components. In addition, it is also equipped with a safety device, a meter and internal parts to complete the functions of different production processes.