Pipe number
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MS2301—150-B4M4-2-H B is the pressure rating; what is the material of M4? What does 2 represent?
Flip to the schematic homepage of that project; that is the correct one.
There is no home page image; it’s directly a flowchart
So what do these codes mean? There has to be some explanation, right?
We look up flowcharts by searching on Baidu
Aren’t you guys afraid of making a mistake? Impressive, I admire it.
On the PID homepage, the legend indicates the symbols
Each design institute has its own method for creating such documents; you won’t know unless you check the legend on the first page
If there are no legend explanations in the PID, check the drawings from the process and piping engineering departments to see if there are tables of pipes or indexes of pipe grades; relevant annotations might be available there
It’s shown in the homepage image; I guess there are two systems of equal scale, and this is the second system, so a ‘2’ was added to distinguish it.
The M4 material is not fixed; it varies from one factory to another. Common materials include M1B carbon steel, 20# steel, M1E stainless steel 304, M2E stainless steel 316, and so on. The “2” may refer to the same production process, with two or more workshops involved in its manufacture.