api 5000API 5000 FLANGE DIMENSIONS INDUSTRIES AND APPLICATIONS WIDELY USED IN THE INDUSTRIES Pumps, Valves, and vessels in manufacturing and food processing. PipeApi 6a Wn Flanges applications including pressure classes – 720 psi and 960 psi, the API specified no changes to the ASA B16.5 Standard, using the 300 lb. and 400 lb. flanges