Seeking standard guidance
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Seeking advice: I am submitting the materials now and have some doubts; I would appreciate some guidance. As follows: The standards set by the Ministry of Chemical Industry are divided into European and American types ； The European series is divided into Series A and Series B ； National standards are divided into Series A and Series B ； Petroleum standards. Do the petrochemical standards correspond to category A in the European system, while the national standards A/B correspond to categories A/B in the European system defined by the Ministry of Chemical Industry? Is that correct? ? Seek guidance. Thank you... thank you……
You already understand it: National Standard Series A/B correspond to the European System Series A/B. National Standard Series A is the same as that of the Ministry of Chemical Industry and the American system, with dimensions serving as the basis. The large-diameter standards in the American system are divided into A/B categories, as specified in HG20592-2009 for large-diameter steel pipe flanges
You already understand it: National Standard Series A/B correspond to the European System Series A/B. National Standard Series A is the same as that of the Ministry of Chemical Industry and the American system, with dimensions serving as the basis. The large-diameter standards in the American system are divided into A/B categories, as specified in HG20592-2009 for large-diameter steel pipe flanges