The meaning of the pipe rack code
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Taking the pipe rack code B1 as specified in standard HG/T 21629-2021 as an example, when the pipe diameter is DN200 or NPS8\", the notation for Series I pipes is as follows: B1-A-200-1500 or B1-A-8\"-1500. For Series II pipes, a “B” should be added after the nominal pipe diameter to distinguish them; the notation in this case is: B1-A-200B-1500. May I ask what the meanings of the “-A-” and “-1500” parts are?
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The pipe rack code is B1-A-200B-1500. What do the parts “-A-” and “-1500” mean in this code?