What are the flange standards?

> Flange standards mainly include pressure vessel flange standards and pipe flange standards.
(1) Pressure vessel flange standards
The determination of the nominal pressure of the flange is related to the maximum operating pressure of the flange, the operating temperature and the flange material. Because when formulating the flange size series and calculating the flange thickness, the mechanical properties of R at ℃ are used as the basis. Therefore, the maximum allowable operating pressure of the flange size determined based on this standard is considered to be the nominal pressure of the flange with this size at ℃.
In short, as long as the nominal diameter and nominal pressure of the flange are determined, the size of the flange is also determined. As for the maximum operating pressure allowed by this flange, it depends on the operating temperature of the flange and what material it is made of. The flange materials specified in the pressure vessel flange standard are low carbon steel (, etc.) and ordinary low steel (, R and R, etc.).
(ii) Pipe flange standards
In addition to flat welding and butt welding flanges, there are also cast steel flanges, cast iron flanges, loop flanges, threaded flanges, etc.
The method and steps for selecting pipe flange standards are the same as those for pressure vessel flanges.
In addition to B., pipe flange standards include: Ministry of Chemical Industry standards ~ Sinopec standards, etc. Among them, the standards of the Ministry of Chemical Industry are divided into European system, American system, etc., and the European system is commonly used in my country.