The typing content of the flange includes nominal diameter, nominal pressure, sealing surface form code, material, series code of the matched steel pipe (with STD, SCH40, XS, SCH80 and other steel pipe wall thickness codes), standards and trademarks.
For example: carbon steel A105 2-1/2 inch SLIP ON CLASS 150 flange, the flange mark as below:
ASTM A105 2-1/2” SO CLASS 150 RF EATHU
Among them, EATHU is a trademark, and RF means raised face flange. Eathu can also perform flange typing according to customer requirements. Welcome to your inquiries of flange.