... 2ASME/ANSI,DIN,JIS 3CCS or BVcertificates 4Durability carbon seel blind flange 1carbon steel,alloy steel 2ASME/ANSI,DIN,JIS 3CCS ... /2615/2616/2617,.JIS B2311/2312/2313, EN10253,API Spec 5CT API Spec 5LASTM A106B/A53B/A179/A192/A200/A210A1/A210C/A213 ... on flange, slip on welding flange, welding ( welded )neck flange, blind flange, orifice flange, welding plate flange, welding neck collar, stub ...