Blind Flange

A blind flange is a circular plate with all the relevant bolt holes, but no central hole, and because of this characteristic the flange is used to close the end of a piping system and the opening of a pressure vessel.
It also allows easy access to the inside of the pipeline or container after sealing and must be reopened.
From the point of view of internal pressure and bolt loading, blind flanges, especially larger flanges, are the most powerful flange types.
However, most of these stresses are bending types close to the center, and because there is no standard inner diameter, these flanges are suitable for higher pressure temperature applications. Blind flanges are commonly used in petrochemicals, plumbing, public services and water engineering.