Q. In piping, how many different types of spectacle blinds are there?

Answer

There are three types:Line Blanks: The line blank functions as a positive shut-off when used as half of a spectacle blind or when used alone.Ring Spacer: A ring spacer, which also fits "wafer style," but has a bore for unrestricted pipe flow, is also available. When the line blank is not present, the only purpose of the ring spacer is to keep the gap between the flanges steady.Spectacle blinds: A solitary blind, as shown in the thumbnail image to the left, is also available.