How is the flange size determined for a DN50 pipe?
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There are so many standards; which one should be used? I checked, and there are steel flanges of the American system as well as those of the European system. Which one should be used? If it says DN50 on the pipe, how can one determine whether it is European standard or American standard?
If needed, I can provide you with the electronic version of the industry standards for the chemical industry
It can be chosen by oneself; generally, European standards are used
According to the model indicated on the flange or the outer diameter of the pipe.
Check the standards, or ask the customer directly! It seems more reliable to simply ask the customer about the outer diameter of the pipe
It depends on which standard you choose. There isn’t much difference.
For the DN designation on the valve body, it follows national standards; however, there are also standards set by the Ministry of Chemicals/Ministry of Machinery. If the size indicated for the valve body is 2.5 inches, then it corresponds to American standards. If labels such as 5K or 10K are used, it indicates Japanese standards, etc. Generally, taking a photo of the valve and showing it to the manufacturer is sufficient to determine what type of valve body it is and what standards it complies with: victory: