How to Classify Pressure Vessels in "Capacity Regulation"?

In order to facilitate safety technology management and supervision and inspection, according to the pressure level of the container, the degree of harm of the medium, and the main role in the production process, the ``Capacity Regulation'' divides the container of its scope of application into three categories: the first type of pressure vessel, Pressure vessels of the second category and pressure vessels of the third category. The specific division is as follows:
 
Pressure vessels of Class I:
low-pressure vessels (except those belonging to class II and Class III).
 
Class II pressure vessels:

1. Medium pressure vessels (except those belonging to class III pressure vessels);
2. Low-pressure reaction vessels and storage vessels with flammable media or moderately hazardous media;
3. Low-pressure containers with extremely toxic and highly hazardous media;
4. Low-pressure shell-and-tube waste heat boiler;
5. Low-pressure glass-lined pressure vessel.

Class III pressure vessels:

① High pressure container;
② A medium-pressure reaction vessel with a flammable medium or a medium-toxic medium and a p•V ≥0.5MPa•m3 and a medium-pressure storage vessel with p•V≥10MPa•m3;
③ Medium-pressure containers with extremely or highly toxic media and low-pressure containers with p•V≥0.2MPa•m3;
④ High-pressure and medium-pressure shell-and-tube waste heat boilers;
⑤ Medium-pressure glass-lined pressure vessel;
⑥ Pressure vessels made of materials with a higher strength level (referred to the lower limit of the specified value of tensile strength in the corresponding standard greater than or equal to 540MPa);
⑦ Mobile pressure vessels, including railway tank cars (medium is liquefied gas, cryogenic liquid), tank cars (liquefied gas transportation vehicle, cryogenic liquid transportation vehicle, permanent gas transportation vehicle) and tank container (medium is liquid gas, cryogenic liquid);
⑧ Spherical container (volume greater than or equal to 50m³);
⑨ Cryogenic liquid storage container (volume is greater than or equal to 5m³).