What is the meaning of classifying pressure vessels into categories 1, 2, and 3?

Pressure vessels can be classified into categories I, II, and III based on factors such as their design and manufacturing standards, materials, and operating environment. The main purpose of this classification is to standardize the design, manufacture, and use of pressure vessels, thereby ensuring the safety of personnel and equipment. Categorize I pressure vessels refer to those that may pose significant hazards during use, such as vessels used for storing flammable and explosive, toxic and harmful substances, or materials under high temperature and pressure. The design and manufacturing of such containers require high standards, necessitating stricter quality control measures. Class II pressure vessels refer to those that may present a moderate level of risk during use, such as vessels used for storing gases like compressed air, nitrogen, liquefied petroleum gas, and certain cryogenic vessels. The manufacturing and use of such containers are relatively common, but it is still necessary to comply with relevant technical standards and operating procedures. Category three pressure vessels are those that rarely present a danger during use, such as vessels used for storing water, certain chemicals, and other substances. The requirements for such containers are relatively low, but they still need to comply with relevant laws, regulations, and technical standards. Different categories of pressure vessels have various regulations and requirements regarding design, manufacturing, installation, inspection, and use. For example, a certain type of container requires more stringent materials and manufacturing processes, more complex testing and inspections, as well as oversight by specialized regulatory agencies ； Containers of categories II and III have relatively lower requirements, but they still need to comply with relevant standards and requirements. In cases where the manufacturer is unaware of the operating pressure inside the tank, it is generally recommended to design and manufacture it based on the highest possible pressure, in order to ensure the safety and reliability of the container. If there are special requirements, it is possible to consult the relevant authorities and conduct an assessment to determine the classification of the container as well as the corresponding design and manufacturing standards. .

I also want to know the reason; if anyone knows, please share it

The higher the category, the greater the risk factor; reaction kettles are classified as category 1 or 2, usually based on the medium used.

Categories 1, 2, and 3 are established accordingly; the higher the category, the greater the risk； Whether it is a jacketed reactor or another type of reaction vessel, there are categories 1, 2, and 3; the classification method is determined based on the operating conditions.

Hierarchical review to reduce costs and enhance security.

This post was last edited by wanlirn on 2023-6-1 at 16:22. Are you asking why companies that manufacture jacketed reactors produce models of category two without knowing the operating conditions of the users? The reason is that category 2 containers are the most commonly used. The container of category 1 that you should be using can also be replaced with a category 2 one; it doesn’t matter anyway since the registration process is the same in both cases. Mass production is definitely for items that are commonly used and in high demand. Those above category two can be customized.

In China, people are divided into first, second, and third classes, and the same is true for equipment

Classification is done for better management and to ensure the safety of containers as well as people’s property. If categories are assigned randomly during design and incorrectly, especially since containers of category three have many specific requirements, then if they are misclassified and not designed, manufactured, or inspected in accordance with the relevant regulations, the regulatory authorities should prohibit their use

Nonsense; there are at least nine ranks among people, and the differences between them are much greater than those between containers.:)