According to the pressure, it can be divided into low pressure (≤1.6 MPa); Medium pressure (
On the basis of pressure classification, considering the harmfulness (flammability and toxicity) of pressure vessels and their working media, China's quality supervision departments classify pressure vessels into I, II and III: Class I vessels generally refer to low-pressure vessels; Class II containers refer to medium-pressure containers and Class I containers for storing flammable or toxic media; Class III containers refer to high-pressure containers and class II containers for storing flammable or toxic media.
In addition, due to the dangerous operation of pressure vessels and pressure pipelines, the production license must be obtained, and welders must be trained and qualified by the quality supervision department before they can take up their posts with certificates.