api 5000Learn about API flanges, which are flanges manufactured following the guides specified in API 6A specification. Find out the pressure ratings, types, dimensions…API 5k Flange API 5000 API 10k Flange API 10000 API 15k Flange API 15000 View API ring joint flange pressure rating, Ramesh Group produces class 3000 To 10000 in forging methods.