What kinds of pressure vessels are there?

Pressure vessels in a broad sense include all closed vessels that bear fluid pressure. However, in industrial production, pressure vessels usually refer to vessels that are prone to accidents and have great harm, and need to be designed, manufactured and used in accordance with the specified technical management norms.

From the perspective of safety supervision, pressure vessels can be divided into three categories according to their working pressure, use, volume and medium risk, and can also be classified according to the risk factors and possible consequences of accidents. For example, vessels with high pressure, large volume, physical or chemical reaction in the vessel, flammability, extremely harmful toxicity and great danger, which may cause serious consequences once an accident occurs, are all included in the third category of pressure vessels. The safety requirements from design, manufacture, installation, use, overhaul, transformation to inspection are higher and stricter than those of Class I and II pressure vessels.

Which containers belong to the third category? Belonging to the third category of vessels are: high-pressure vessels; High and medium pressure shell-and-tube waste heat boilers; Medium-pressure vessels and low-pressure vessels with highly toxic and dangerous media whose product of pressure and volume is greater than or equal to 0.2 MPa/m3; The product of pressure and volume is greater than or equal to 0.5 MPa/m3, and the product of pressure and volume is greater than or equal to 10 MPa/m3. Medium pressure glass-lined pressure vessel; Pressure vessels made of advanced materials (the lower limit of tensile strength specified in the corresponding standards is greater than 540 MPa); Mobile pressure vessels, including railway tank cars (medium is liquefied gas and cryogenic gas), tank cars (liquefied gas transport (semi-trailer), cryogenic gas transport (semi-trailer) and permanent gas transport (semi-trailer)) and tank containers (medium is liquefied gas and cryogenic gas); Spherical storage tank (volume greater than or equal to 50 cubic meters); Cryogenic liquid storage container (volume greater than 5 cubic meters).

Which vessels belong to the second type of pressure vessels? Medium-pressure vessels with moderate toxicity, inflammable medium or low-pressure reaction vessels and storage vessels, low-pressure vessels containing extremely and highly dangerous medium, low-pressure shell-and-tube waste heat boilers and low-pressure glass-lined pressure vessels all belong to Class II pressure vessels, except for Class III regulations.

Low-pressure vessels other than those specified in Class II and III pressure vessels belong to Class I pressure vessels.