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Blind flange is like a flange cover, also called blind disk or flanged pipe plug. Blind flange has no holes in the centre, for to seal the pipe opening. So it's function is the same as the pipe plug or the pipe cap. The difference is blind flange is a detachable equipment, easy to replace or do maintenance.
Size :
Size: 1/2”-60”Standard :
ANSI, JIS, DIN, BS,GOSTMaterial :
Stainless Steel (ASTM A182 F304/304L, F316/316L, F321)Pressure :
CLASS 150, CLASS 300, CLASS 600, CLASS 900,CLASS 1500, CLASS 2500, CLASS 3000Face type :
F.F., R.F., R.T.J.Thickness :
Schedule 10(S) to SCH 160Stainless Steel Blind Flange-WS4
The majority of blind flanges are of basic constitution, require minimal machining compared to other flanges, and weigh more than most options given the lack of a bore. Although these are typically provided as blanks to match up to slip on and weld neck flanges, we offer them custom machined as well. Popular alterations include NPT threads in the center, as well as custom bore holes to function as slip on flanges without hubs.
Spectacle Blinds are another somewhat uncommon but important application for capping pipelines. A picture of a spectacle blind is shown below. The name comes from the fact that the assembly looks like eyeglasses, or “spectacles”. These are normally used in piping systems, usually between two standard flanges, and are designed to block off a section of pipe. However these are used where the customer needs to block this connection off somewhat frequently. They are typically used where there is piping connected to both flanges, where you cannot simply drop a standard blind flange in, because the flanges cannot be pulled apart far enough to drop in the blind flange.