How are container categories classified?
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I would like to know how containers are classified into Categories I, II, and III
Appendix A, Page 42 of the Fixed Equipment Regulations: The classification of pressure vessels should be determined based on the properties of the medium. First, select the appropriate classification chart in accordance with the relevant requirements; then, using the design pressure p (in MPa) and volume (in L), identify the coordinate points to determine the category of the pressure vessel. (1) For the first group of media, the classification of pressure vessels is shown in Figure A-1； (2) For the second group of media, the classification of pressure vessel categories is shown in Figure A-2. Group 1 media: Chemical media with extreme or high toxicity, explosive media, liquefied gases ； The second group of media refers to those media other than those in the first group.
You can understand it all by looking at the tolerance specifications; it’s impossible to explain this thing in just a few words
For details, see Annex A of TSG R0004-2009 \"Regulations on Safety Technical Inspection of Fixed Pressure Vessels\"
The second floor explained it in great detail: first determine the medium, and then consult the PV value table.