What are API 6A flanges?

api 5000API 5000 FLANGE DIMENSIONS INDUSTRIES AND APPLICATIONS WIDELY USED IN THE INDUSTRIES Pumps, Valves, and vessels in manufacturing and food processing. PipeAPI 5K API 5K means an API-defined BOP confuration with a rated working pressure of 5,000 psi and as described in API RP 53, adopted by reference at 20 AAC 25.527(c). Source: Alaska