The international standard of pipe flanges has two systems, namely, the German DIN (including the former Soviet Union) as the representative of the European pipe flange system and the United States ANSI Pipe flange as the representative of the American pipe system. In addition, Japan JIS pipe flange, but in the petrochemical plant is generally used only for public works, and in the international impact of small. The introduction of national pipe Flanges in the following:
1, to Germany and the former Soviet Union as the representative of the European System pipe Flanges 2, the American system pipe flange standard, to ANSIB16.5 and ANSIB16.47 for the Representative 3, the United Kingdom and France flange standards, each with two casing flange standard.
To sum up, the international common pipe flange standard can be summed up as two different, and can not be interchangeable pipe flange system: A German-represented European pipe flange system;
Ios 7005 is a standard promulgated by the International Organization for Standardization in 1992, which is actually the standard of pipe flanges which combine the two series of pipe flanges in the United States and Germany.