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