Questions about HG20592-2009
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I would like to ask the teachers: when looking up information on flanges in HG20592-2009, should one refer to the dimensions related to flange connections or those related to the flange structure? For example, for a DN65 pipe, the results obtained from these two sources differ somewhat; which one should be considered correct? Please give your advice, teachers
It’s not clear whether your question refers to pipes or flanges; regardless of whether it’s flanges or pipes, different pressure ratings result in different dimensions.
Just choose according to the subsequent structural dimensions.
The dimensions vary depending on the pipeline pressure rating
The data in the parameter table is consistent, unless there is an error... For 20592, it is necessary to distinguish between Series A and Series B pipe diameters; for example, for DN50, the diameter for Series A is 60.3, while that for Series B is 57
I’m not sure what exactly you mean by “checking the flange”. Do you mean checking the dimensions of the flange based on its model, and does the dimension table need to take the pressure rating into account?
There are various types of flanges such as PL, SO, WN, SW, etc., and each type of flange comes in different pressure ratings
I guess he was referring to the dimensions of the flange sealing surface and the flange size
There are many errors in this version; three corrigenda have already been released. But there are still errors in the corrections!
The key is, what parameters of the flange do you need to check? Are it connection dimensions or structural dimensions?
When I selected the flange, I based my choice on this specification; however, the person who reviewed the drawings said that the specification was outdated...