... standard, Japanese standard, the Russian standard.Pipe flange standard system on the international 2,The international pipe flange standard system 1 ... , a, Nominal pressure: 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 b, The ... rest are belonging to American Flange of Americas flange system. on GB standards, largest nominal pressure is 4Mpa of Europe flange ...