Standard system of flanges

There are two main international pipe flange standards, namely the European pipe flange system represented by German DIN (including the former Soviet Union) and the American pipe flange system represented by American ANSI pipe flanges. In addition, there are Japanese JIS pipe flanges, but they are generally only used in public works in petrochemical plants, and they have little international impact. Now the introduction of pipe flanges in various countries is as follows:

　　1, European system pipe flanges represented by Germany and the former Soviet Union

　　2, American system pipe flange standards, represented by ANSIB16.5 and ANSIB16.47

　　3, British and French pipe flange standards, the two countries each have two casing flange standards.