The issue of classification

See Article 6, Paragraph 1, Item (8) of the Regulatory Requirements: Pressure vessels made of materials with a high strength level (i.e., those for which the specified minimum tensile strength value in the relevant standards is greater than or equal to 540 MPa)

According to Article 6 of the pressure vessel regulations, pressure vessels are classified based on pressure level, type, toxicity of the medium, and flammability of the medium; this classification has nothing to do with the tensile strength of the material. Therefore, such vessels should be classified as Category 1 vessels. However, the tensile strength of the pipes along with the corresponding assurance methods should be specified in the technical requirements of the drawings

I believe they should be classified into three categories. Specifically, according to Article 6, Paragraph 1, Item (8) of the Regulatory Regulations, pressure vessels manufactured from materials with a high strength level – meaning that the minimum specified tensile strength value in the relevant standards is 540 MPa or higher – are considered third-class pressure vessels.

I believe they should be classified into three categories. Specifically, according to Article 6, Paragraph 1 of the Regulations, pressure vessels fall into the third category under one of the following conditions: (8) Pressure vessels manufactured from materials with a high strength level (meaning that the lower limit specified for tensile strength in the relevant standards is greater than or equal to 540 MPa). So it is a third-class pressure vessel.

It should be classified into three categories, on the basis that the lower limit of the tensile strength of the duplex steel used for the heat exchange tubes is greater than 540 MPa.

It should be classified as Category III according to the Code.

I think the question is this: Is the classification determined based on the shell side, as mentioned by the original poster? Isn’t there a note attached in Chapter 1 of the pressure vessel regulations? Are heat exchangers classified according to their tube side and shell side conditions, with the category of the vessel being determined by the higher of those values? In your case, no information is provided regarding the temperature, pressure, medium, or material of either the tube side or the shell side; it’s therefore difficult to determine how to classify it.

Could you tell me the reason? Personally, I think there should be three categories

Container classification is aimed at hierarchical management, while categorization is based on the container’s pressure and the degree of hazard associated with the medium. According to Article 6(8) of the capacity regulations and Note 2, it seems it should be classified as Category 3; however, if only the heat exchange tubes are made of high-strength steel with a tensile strength greater than 540, we generally classify it as Category 1 in our designs.

It should not be classified into three categories. The reason is that, under the regulations governing pressure vessels, the inner diameter must be 0.15 m or greater; however, the size of the heat exchange tubes is far less than 0.15 m. Since they are not subject to those regulations, why is there a need for classification? This is just my personal opinion – please point out any mistakes

It should be classified as one category, for the same reason as on floor 13.

It seems that the conditions are not yet complete. In my opinion, if a vessel is classified as Category 1 based on the pressure, temperature, and medium involved, it depends on which aspect is used for this classification. If it is based on the tube side, then the tensile strength limit of the tube sheet material must be greater than 540 MPa; in such cases, it should be classified as Category 3； If classified by the shell side, the minimum tensile strength of the shell side material should be greater than 540 MPa; in this case it should also be classified into category three ； However, only when the minimum tensile strength of the heat exchange tubes is greater than 540 MPa, and the tensile strength of other materials such as the cylinder and head is less than 540 MPa, do I think they should be classified as category three; after all, the diameter of the heat exchange tubes is quite small. Personal opinion, for reference only

Personally, I believe it should be classified as category three according to the provisions in the Code.

It is divided into three categories, as specified in Article 6, Paragraph 1 on page 7 of the regulations.