欧洲法兰体系：德国DIN（包括苏联）
European flange system: German DIN (including the Soviet Union)
公称压力：0.1, 0.25, 0.6, 1.0, 1.6, 2.5, 4.0, 6.4, 10.0, 16.0, 25.0, 32.0, 40.0, Mpa ；
Nominal pressure: 0.1, 0.25, 0.6, 1, 1.6, 2.5, 4, 6.4, 10, 16, 25, 25, 25, Mpa;
公算通径：15~600mm ；
The expected diameter: 15~600mm;
法兰的结构型式：平焊板式、平焊环松套式、卷边松套式、对焊卷边松套式、对焊环松套式、对焊式、带颈螺纹连接式、整体式及法兰盖 ；
Flange structure type: flat welding plate type, flat welding ring loose nest, crimping loose nest, butt welding crimping loose nest, butt welding ring loose nest, butt welding, neck thread connection type, integral type and flange cover;
法兰密封面有：平面、凹面、凹凸面、榫槽面、橡胶环连接面、透镜面及膜片焊接面 ；
Flange sealing surface includes plane, concave surface, concave convex surface, tenon groove surface, rubber ring connection surface, lens surface and diaphragm welding surface.
苏联于1980年发布的OCT管法兰同录标准与德国DIN标准相似。
The standard of OCT pipe flange released by the Soviet Union in 1980 is similar to that of German DIN standard.