2026-04-09Views：
Belong. Class II pressure vessels belong to special equipment, and Class II vessels are also called "Class II pressure vessels". It refers to the classification according to the pressure grade of the vessel in order to facilitate the safety technical supervision and management of the pressure vessel (see "pressure vessel").
Pressure vessel is special equipment, which refers to the closed equipment containing gas or liquid and bearing pressure. Its scope is specified as fixed containers and movable containers for gas, liquefied gas and liquid with working pressure greater than or equal to 0.1MPa (gauge pressure) and the product of pressure and volume greater than or equal to 2.5MPa • L; gas cylinders with nominal working pressure greater than or equal to 0.2MPa (gauge pressure) and the product of pressure and volume greater than or equal to 1.0MPa • L, liquefied gas and liquid with standard boiling point equal to or lower than 60 ℃; Oxygen cabin, etc.
TSG R0004-2009 Technical Supervision Regulation for Stationary Pressure Vessels. Applicable to pressure vessels with the following conditions at the same time. 1 working pressure is greater than or equal to 0.1MPa
2 The product of working pressure and volume is greater than or equal to 2.5MPa * L
3 when the medium contained is gas, liquefied gas and liquid whose working temperature is higher than or equal to its standard boiling point (note 1-4) note 1-4 when the medium in the container is liquid whose working temperature is lower than its standard boiling point, if the product of the volume of the gas phase space and the working pressure is greater than or equal to 2.5MPa * L, it also belongs to the scope of application of this standard. Therefore, the fixed air storage tank with working pressure of 0.8MPa and volume of 600L you mentioned belongs to special equipment, and its manufacturing needs to conform to the provisions of the TSG R0004-2009.
The inspection and standard of pressure vessels are sealed containers that bear gas or liquid pressure inside or outside and have higher requirements for the safety. In the early days, it was mainly used in the chemical industry, and the pressure was mostly below 10 MPa. After the emergence of high-pressure production processes such as synthetic ammonia and high-pressure polyethylene, the pressure of the pressure vessel is required to reach more than 100 MPa.
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