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The definition of pressure vessels in the catalog of special equipment: A pressure vessel is a closed device used to hold gases or liquids and is subject to certain pressures. It includes fixed and mobile vessels whose maximum working pressure is 0.1 MPa (gauge pressure) or higher for gases and liquefied gases, and whose maximum working temperature is equal to or higher than their standard boiling point; such vessels also have a volume of 30 L or more and an inner diameter of 150 mm or more (for non-circular cross-sections, this refers to the largest geometric dimension of the cross-section)； Gas cylinders, liquefied gas cylinders, and cylinders for liquids with a standard boiling point of 60°C or lower, whose nominal working pressure at full charge is greater than or equal to 0.2 MPa (gauge pressure), and whose product of pressure and volume is greater than or equal to 1.0 MPa•L ； Oxygen chamber. Among them, a comma is used before “with a volume of 30L or more”; in other words, a pressure vessel refers to a closed device used for holding gases or liquids and capable of withstanding certain pressures. It is defined as a fixed or mobile container whose maximum working pressure is 0.1MPa (gauge pressure) or more, whose volume is 30L or more, and whose inner diameter (for non-circular cross-sections, this refers to the largest geometric dimension of the internal boundary) is 150mm or more. So it becomes a matter of meeting two conditions; according to TSG 21-2016, there are three conditions. Therefore, perhaps the definition of pressure vessels in the \"Catalogue of Special Equipment\" needs to be revised.