Blind Flange Flat Face flange type and popular using in pipe jointing works, blind flange didn't have center hole, flanges standard DIN2527, EN1092-1 type 05, BS4504 code 105 and GOST33259 (GOST12815-80), SANS1123, BS 10 Table D E both have blind flange type, PN6 PN10 PN16 PN25 PN40 EN1092-1 05 DIN2527, ANSI B16.5 B16.47 and more standards.