Flange & Fitting

General Introduction Pipe flanges manufactured in accordance with ASME B16.5 are designated to 7 pressure ratings: Class 150, Class 300, Class 400, Class 600, Class 900, Class 1500 and Class 2500. The standard specification covers flanges with pressure ratings of Class 150, 300, 400, 600, 900 and 1500 in sizes NPS 1/2 through NPS 24 and flanges with pressure rating …