Blind flanges, available in all sizes and pressure ratings, are solid forgings used to close off the end of a piping system and to gain easy access to the interior of the line. Unless otherwise specified, Class 150 (PN 20) and Class 300 (PN 50) flanges in all types except lap joint flanges are furnished with a .06" (1.6 mm) raised face (which is included in the flange thickness dimension). Heavier pressure ratings are machined with a .25" (6.4 mm) raised face, in addition to the designated flange thickness. Lap Joint flanges are machined with a flat face and a fillet radius to accommodate the stub end or pipe lap.

Types of Blind Flanges are