Why are pressure vessels classified

The purpose of classification is to facilitate hierarchical safety technology management and supervision; different requirements are set for the selection of materials, design, manufacturing, and use management of pressure vessels depending on their category; it also makes it easier to compile statistics for submission to the relevant authorities, and it lays the foundation for computer-based management

Are there different safety technical management and supervision requirements for Class 1 and Class 2 pressure vessels? Are these requirements established by the industry itself or by **relevant departments**? Do these departments have different requirements? If not, then there are no differing requirements.

To facilitate safety technology supervision and management, pressure vessels within the scope of application of these regulations are classified into three categories. The principles for this classification are as follows: 1. Pressure vessels falling under any of the following circumstances are classified as Category 3 pressure vessels: (1) High-pressure vessels； (2) Medium-pressure vessels (only for media with extremely high and high toxicity) ； (3) Medium-pressure storage vessels (only for flammable or moderately hazardous media with a pV product of 10 MPa•m3 or greater) ； (4) Medium-pressure reaction vessel (only for flammable or moderately hazardous media with a pV product of 0.5 MPa•m3 or greater) ； (5) Low-pressure vessels (only for media with extremely high or high toxicity, and a pV product of 0.2 MPa•m3 or greater) ； (6) High-pressure and medium-pressure shell-and-tube waste heat boilers ； (7) Medium-pressure glass-lined pressure vessels ； (8) Pressure vessels manufactured from materials with a high strength level (meaning that the minimum specified value for tensile strength in the relevant standards is 540 Mpa or higher) ； (9) Mobile pressure vessels, including railway tank cars (for liquefied gases and cryogenic liquids), tank trucks, and tank containers (for liquefied gases and cryogenic liquids), etc ； (10) Spherical storage tanks (volume greater than or equal to 50 m3) ； (11) Low-temperature liquid storage containers (volume greater than 5 m3). 2. A pressure vessel falls under Category II in one of the following situations (except as specified in Paragraph 1 of this article): (1) Medium-pressure vessels ； (2) Low-pressure vessels (only for media with extremely high and high toxicity) ； (3) Low-pressure reaction vessels and low-pressure storage vessels (only for flammable media or media with moderate toxicity) ； (4) Low-pressure shell-and-tube waste heat boiler ； (5) Low-pressure glass-lined pressure vessels. 3. Low-pressure vessels are classified as Class 1 pressure vessels (except as provided in paragraphs 1 and 2 of this article).

Classification facilitates hierarchical management and supervision of safety technologies. Different requirements are set for the selection of materials, design, manufacturing, and usage management of pressure vessels according to various categories, which makes it easier to compile statistics for submission to the relevant authorities and lays the foundation for computer-based management.

In short, it is meant to facilitate hierarchical management and supervision of security technologies.

Pressure vessels are classified to facilitate management and inspection

Based on different levels of danger, it facilitates safe management and supervision.

Actually, after working for a long time and having dealt with pressure vessels for a while, one naturally learns the need to make such distinctions. Not only does China want it, but other ** countries also need to demarcate it. Why do you think so? Different grades have varying management requirements, materials used in design, welding methods, and so on.

It’s actually easy to understand – everything in the world needs to be classified. When answering questions, it’s done for the sake of easier management and oversight, as well as regarding billing issues.

Different classification levels naturally result in different requirements for supervision and management

It facilitates supervision and management; as a result, more attention is naturally paid to the more dangerous containers

Relationship between container category classification and the scope of supervision: The first three paragraphs of Article 3 of the container regulations specify the scope of supervision (or supervision conditions). The scope of supervision under these regulations can be understood as determining whether a pressure vessel that has been designed (or manufactured) needs to be subject to supervision in accordance with these regulations; this is determined by evaluating whether all three conditions specified in the scope of supervision are met. If all three conditions are satisfied, then such a vessel must unconditionally be subject to supervision. If any one of the 3 conditions is not met, or is met but does not satisfy the requirements, no inspection will be carried out on that container in accordance with the container regulations. 　　The general provisions in Article 4 of the regulations establish the principles for classifying pressure vessels. Based on the principle that regulations concerning pressure vessels are conducive to safety supervision and management, and that pressure vessels within the scope of application of these regulations are classified into 3 categories, it can be concluded that pressure vessels not subject to supervision under such regulations should not be classified either. The classification of container categories depends entirely on the determination of containers within the scope of supervision; in other words, the scope of supervision is the sole criterion for deciding whether pressure containers need to be classified. It can be inferred that the classification of containers depends unidirectionally on the monitoring scope; their relationship is one of unidirectional dependence.