Blank flange is the same to Blind flange, usually ANSI (ASME) B16.5, BS4504 and SANS1123 flanges standard called blind flange type to blank flange, DIN EN1092-1 UNI GOST33259 and JIS B2220 usually call blind flange but BS4504, ANSI B16.5 and SANS1123 called blank flange, blank flange also have RF FF and RTJ facing type.
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