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A182 F304 SS UNS S30400 1.4307 Spectacle Blind Flange

Stainless Steel 304 Spectacle Blind Flange, also known as a SS 304 Figure-8 Blind Flange or a paddle blind, is a special type of flange used in piping systems. SS 304 Spectacle Blind Flange is primarily used for isolating sections of a pipeline or for temporary closure during maintenance or inspection activities.

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Stainless Steel 304 Spectacle Blind Flange, also known as a SS 304 Figure-8 Blind Flange or a paddle blind, is a special type of flange used in piping systems. SS 304 Spectacle Blind Flange is primarily used for isolating sections of a pipeline or for temporary closure during maintenance or inspection activities.

 

ASTM A182 F304 Spectacle Blind Flange consists of two metal discs connected by a central section. The shape of the central section resembles a spectacle or figure-8, which is where the name originates. One disc is a solid plate, while the other has a circular hole in the center. The ASME b16.48 solid plate is used for complete blockage or closure, while the plate with the hole allows flow through the pipeline.

304 Stainless Steel Spectacle Blind Flanges

When installed in a piping system, the SS DIN 1.4301 Flange is positioned between two flanges and bolted together. In the closed position, the solid plate is aligned with the flange facing the flow, completely obstructing the passage of fluid. In the open position, the plate with the hole is aligned with the flange facing the flow, allowing fluid to pass through.

 

ASME SA182 SS 304 Flanges are commonly made from materials such as carbon steel, stainless steel, or other alloys depending on the requirements of the piping system and the fluid being transported. ANSI B16.5 SS F304 Flanges are available in various sizes, pressure ratings, and facing types to suit different piping applications.

 

A182 F304 Flange Specification Chart

Specifications List ASTM A182 / ASME SA182
Class / Pressure Rating 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Size Chart 1/2″ (15 NB) to 48″ (1200NB)
ASTM Standards ANSI/ASME B16.5, B16.48, BS4504, B 16.47 Series A & B, BS 10, EN-1092, DIN, etc.
Standard s ANSI, ASME, BS, DIN, EN etc.
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