National standards and chemical industry standards for flanges
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Hai Youhao: What are the specific differences between the national standards for flanges and the chemical industry standards? A comparison table would be helpful
Under the same standard, only adjacent versions will show the changes; for others, one must check on their own； With different standards, the results of the checks vary, so why waste that effort?
This post was last edited by madike on 2016-4-21 at 16:44. The latest national standard is generally GB/T9113-2010; for the Ministry of Chemical Industry, it is HG/T20592-2009. Do it yourself to ensure self-sufficiency. . .
This varies depending on the specific type of flange: there are many flanges that comply with national standards, which offer a high degree of specificity. Chemical industry standards are developed by building upon national standards as well as other industry standards
The petrochemical standard SH3406 is also a flange standard; the standard we have chosen is similar to the American standard