Butt Welding Stainless Steel Flange 304 Flat Welding Flange Carbon Steel Flange High Pressure Gb

Butt Welding Stainless Steel Flange 304 Flat Welding Flange Carbon Steel Flange Large Diameter Flange High Pressure Gb

The pipe flanges of various countries are introduced below:

The European system represented by Germany and the former Soviet Union pipe flange

American system pipe flanges, represented by ANSI B16.5 and ANSI B 16.47.

British and French pipe flange standards, two countries each have two pipe flange standards, to sum up, the international pipe flange standard can be summarized as two different, and not interchangeable pipe flange system: a European pipe flange system represented by Germany; Another is the American pipe flange system represented by the United States. Ios7005-1 is a standard promulgated by the International Organization for Standardization in 1992, the standard is actually the United States and Germany two series of pipe flanges merged into the pipe flange standard. The pipe flange connection sizes of the two systems are different and cannot be matched with each other. The pipe flanges of the two systems are most suitable to be distinguished by pressure grade, that is, The European system is 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0, 25.0, 32.0, 40.0MPa. The American system is 1.0, 2.0, 5.0, 11.0, 15.0, 26.0, 42.0MPa.

1. Current status of pipe flange standards in China

Common standards for pipe flanges used in China's chemical and petrochemical industries 1. British pipe (internationally common piping series) GB 9112-9125, SH 3406

2, metric pipe (commonly used domestic steel pipe outer diameter size series) HGJ44 ~ 76, JB/T74 ~ 90 DIN connection size and JB standard is different