Figure 8 Blind Flange Dimensions

Spectable flanges get their name because they look like a pair of reading glasses or spectacles.

Figure 8 blind flange dimensions.

A spectacle flange is a specialty flange made of two metal discs attached in the middle by a small section of steel. And thickness based on flange rating and blind type. A spectacle blind is basically made up of two metal discs attached to each other by a metal strip as shown in the figure. Spectacle blind 2 flanges 3 gaskets 4 stud bolts.

1 2 to 60 dn 12mm to dn 1500mm. Spectacle blind flange also known as figure 8 flange which is combination of the two that can be rotated to function as single bind or a ring spacer. Dimensions of spectacle blinds according to asme b16 48. An 8 blind or a spectacle blind is a piping fitting that is used for providing positive isolation.

Spectacle blinds or line blanks are flat plates sandwiched between flanges for positive isolation of process fluid. One is solid disc and the other is hollowed. A figure 8 blank also called a spectacle blind flange is a pressure retaining plate with one solid end and one open end connected with a web or tie bar. During dimensional inspection of flange you should check for following.

Find your paddle blind dimensions for o d. This kind of flange is generally a piece of metal than is cut to fit between two pipe flanges and usually sandwiched between two gaskets a spectacle blind is often made from two metal discs that. A spectacle blind also known as a figure 8 blind is generally a piece of metal that is cut to fit between two pipe flange and usually sandwiched between two gaskets. Spectacle blinds should be made from a plate or forging specification approved for use by asme b31 3 of essentially the same chemical composition as the mating flanges.

Drill down to both series a and series b blinds. Dimensions of class 150 rf figure 8 blanks or spectacle blinds as per asme b16 48. A spectacle blind is often made from two metal discs that are attached to each other by a small section of steel. Outer diameter of body.

Carbon steel units are available from stock. In practice these dimensions have been rounded round off upwards. Wt thickness of the web or tie bar should be 6 mm minimum or equal to thickness t if less than 6 mm. Blind flange dimensions are covered in asme b16 5 which covers pipe flanges and flanged fittings for size nps to 24 for above nps 26 to 60 it should be as per asme b16 47.