Standards for steel flanges?
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I’d like to ask everyone which standard is most commonly used for steel flanges? Which standards are used most often: the national standard GB, the machinery standard JB, the chemical industry standard HG, the petrochemical industry standard SH, etc.? I see that when we order flanges, only the pressure in kilograms and the nominal diameter are specified, without any indication of which standard should be followed.
\"Compilation of Parts and Related Standards – Flanges Volume\": Generally, different industries have standard series that they commonly use; for example, the petrochemical industry uses the SH standard series, while the machinery industry uses the JB standard series