The meaning of suffixes after equipment classification
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I would like to ask professionals: I have received a set of equipment drawings, and in the equipment classification, the codes MR and ME are listed after it. What do these two codes mean? Could someone please explain this?
Personal opinion: M stands for medium pressure (code M), with a value of ≥1.6 MPa and <10 MPa. E is the heat exchange pressure vessel, and R is the reaction pressure vessel.
L, low pressure. M, medium voltage. H, high pressure. U, ultra-high pressure. R, reaction. E, heat exchange. S, separate. C, Storage.
Looking at the explanation above, it makes sense in practice; I guess that’s what it means. But when it appears after a category, what standard does it refer to?
There’s no addition shown here; only categories are present. Category matching is fine.
It’s an English abbreviation based on classification, and it’s not necessary to write it; there’s no requirement for that.
On the pattern, it is only necessary to indicate the category; the pressure rating is determined by the design pressure, and the type is indicated by its name.
Someone else asked; in TSG 21-2016, go to Appendix A, sections A3-A4.
It is permissible to indicate the container classification in accordance with the requirements of Appendix A of TSG 21-2016.
It’s mainly because such markings are rarely seen on equipment drawings in this area; I didn’t think of that. There are instructions in the TSG, but they don’t state that it should be written here!