Spectacle Plates

A spectacle blind is a steel plate cut into two discs of equal diameter and thickness. One disc is a solid plate while the other is a ring, whose inside diameter is equal to that of a flange. The two discs are connected by a small section of metal.

Spectacle Blinds are simple safety devices that are installed between two pipe flanges. During normal operation, the open end is installed as a spacer to allow uninterrupted flow. To stop the flow in the pipeline, the blind end is rotated into place between the flanges.