There are two main international standards for pipe flanges, namely the European pipe flange system represented by Germany DIN (including the former Soviet Union) and the American pipe flange system represented by ANSI flange. In addition, there are JIS tube flanges in Japan, but they are generally used only for public utilities in petrochemical plants, and have little international impact. A brief introduction to the national pipe flanges is presented as follows:
1, the European system pipe flanges represented by Germany and the former Soviet Union.
2, the American system tube flange standard is represented by ANSI B16.5 and ANSI B 16.47.
3, British and French flanges standard, each of the two countries has two cannula flanges.
To sum up, the international standard of pipe flange can be summarized as two different and interchangeable pipe flange systems: a European pipe flange system represented by Germany, and the other one is the American pipe flange system represented by the United States.