Selection of flange type
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According to Chapter 13 of the \"Code for Design of Industrial Metal Piping\" GB50316-2000 (2008 edition), flat-weld (plate-type) flanges should not be used for Class A1 fluids, and they are not recommended either for Class A2 fluids. There is no doubt regarding the regulations for Class A1 fluids; however, it seems that many design firms – including myself – still tend to use flat-weld flanges for Class A2 fluids out of inertia. Is this really appropriate? Especially in chemical plants, many pipes can be classified as A2 (according to the definition of A2: toxins with high, moderate, or low toxicity are all considered A2 fluids). I hope experts can explain this
We generally no longer use flat-face flanges nowadays; instead, we use raised-face flanges, and there is no need for butt-welded flanges.
The original poster asked a very good question; I have the same doubts and hope to get an explanation
That’s just how China is – if you don’t kill them outright, they will try to play tricks on you. I think if it’s not changed to \"should not\" instead of \"is not appropriate\", the outcome will likely be different. What do you think?