api5000API 5000 (Class 1500) Connection Types Performance Requirement API 6A Flange Means; Studded; Bolted; PR1; PR2; American Petroleum Institute; Coating Types Of API STD 6A Hh’Obsolete’, ’discontinued’ or ’withdrawn’ API flanges have not been included in the above slide rule.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