front barrel flang Size: from 1/2 to 200 inch ( ... EN, JB, GB, HG, UNI, API CS,SS... front barrel flang Technics: Forged Size: from 1/2 to 200 inch ... Flange, Lwnrf (Ff), Thrf (Ff) Facing Method: rust preventing oil, spray paint (black, yellow), hot galvanization, cold galvanization or ... of pipe line; easy to seal pipe line, such as oil, petroleum, gas, chemical industry, nuclear power station, water ...