... , 600 , 900, 1500 , 2500(2).ASME/ANSI B16.47(SERIES A & B) : WELDING NECK FLANGE, BLIND FLANGE.Pressure Class :75, 150, 300 ... , 400 , 600 , 900(3). ASME/ANSI B16.36 : (ORIFICE FLANGES) WELDING NECK FLANGE, SLIPON FLANGE, THREADED FLANGE.Pressure Class :300, 400 ... FLANGE.Pressure Class :300, 400 , 600 , 900(6).API 6A :WELDING NECK FLANGE, THREAD FLANGE,BLIND FLANGE.Pressure :2000Psi, 3000Psi, 5000Psi ...