api5000class API 5000 API 10000 API 15000 AA, BB, CC PSL 1 PSL 2 PSL 2 DD, EE, FF PSL 1 PSL 2 PSL 3 HH PSL 3 PSL 3 PSL 3 Our extensive experience in manufac-turing valves for wellhead’Obsolete’, ’discontinued’ or ’withdrawn’ API flanges have not been included in the above slide rule. Important note:- the above slide rule assumes ambient temperatures. Additionally, as