... 20 countries, such as America, Europe, Southeast Asia, etc.. ANSI Flanges* ASME/ANSI B16.5 : WELDING NECK FLANGE, SLIP-ON FLANGE ... , 150, 300, 400 , 600 , 900* ASME/ANSI B16.36 : (ORIFICE FLANGES) WELDING NECK FLANGE, SLIPON FLANGE, THREADED FLANGE.Pressure Class :300 ...