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Blind Flanges

Product name: Blind Flange

Blind flange is a round plate with bolt holes but no center hole. A blind flange is used to close pipe system, also permits easy access to a line or vessel once it has been sealed and must be reopened. Industrial blind flanges are usually made of forged material for better physical performance. SGV offer forged carbon steel,alloy, stainless steel blind flanges.

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Standard and Scope:
Size: NPS 1/2"~72" DN15~DN2000                            
Pressure Rating: Class 150~2500 PN2.5~PN250                
Connection: RTJ ring type joint, RF raised face, and so on
Material: Carbon steel ,Low temperature steel, Stainless steel, Alloy, ASTM A182 F304/304L, F316/316L, F316H, F310, F321, A182 F11, F22, ASTM A105, A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, A516.60, Q235, 20, A3, 16Mn and so on
Main Standard: : ANSI, API, BS, EN, JIS, GB, GOST, MSS, SP, AWWA ASME B16. 5(for NPS≤24); ASME B16.47 series B、API 605 or ASME  B16.47 series A、MSS SP-44(for NPS>24); BS EN1092-1, DIN2543, DIN2544, DIN2545, DIN2546; GOST 12819, GOST12820, GOST 12821  
Design and feature

A blind flange is installed into a pipeline when a repair is required further up the line. So the flange can be disconnected without fear of loosing medium of down stream. Often this type of blockade is used when a temporary blockade is needed, so we can adding another line or a new valve onto an existing pipeline. This is also used for shut down line permanently. 

Since the maximum stresses in a blind flange are bending stresses at the center, they can safely be allowed to be higher than in other types of flanges.
Considering factors like internal pressure and bolt loading, blind flanges, especially for large sizes, are the most highly stressed of all types of flanges.
Blind flanges are sometimes supplied with NPT fittings which allow pressure test connections to be fitted.
They are used to blank off the ends of pipe.
They are also used to blank off the ends of valves and pressure vessel opening.

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