Plate flange is the most popular using flange type, DIN EN1092-1 BS4504 GOST33259-2015 SANS1123 JIS B2220 KS B1503 and ANSI B16.5 both have plate flange type, plate flange pressure for PN6 PN10 PN16 PN25 PN40, ANSI B16.5 rating class for 150 and 300, JIS B2220 and KS B1503 class for 5K 10K 16K 20K, plate flange facing type have flat face, raised face.