Spectacle Blind Installation
A spectacle blindconsists of a blind and spacer.
Spectacle blind installation. Spectacle blind spades and spacers are also known as figure 8 paddle blank slip blind and spacer. These are three different components that used in piping for positive isolation of the section of a line or equipment during maintenance and shutdown. Click on the link to learn about the chemical and mechanical properties and the selection criteria of these common spectacle blind grades which are the same as.
Spectacle blinds are generally installe. Spectacle blinds be applied in systems which regularly need to be separated from other installations. Instead of bolting the blind in place around the full circumference of the pipe like you would a pipe flange you instead install it by inserting one of the flange bolts through the hole on the central tie bar.
If the spectacle blind in the close position is rotated the pipe is blanked off and no flow is possible. Spectacle blinds are available in standard sizes up to 24 inches and in forged material grades like astm a105 high temperature carbon a350 low temperature carbon and various astm a182 grades alloy stainless steel duplex. Normally a spectacle blind is mounted in the open position so that flow through the pipe is possible.
During the installation of spacers the flange and associated piping should be pulled together and a the ring spacer has to be installed to fill the gap. The blind is installed in between flanges tosecurely shutdown pipeline during leakage continue reading. Spacer rings are made to match the pipe id with the same thickness as the single blind that it replaces.
