ASTM A182 F53 Super Duplex Steel Spectacle Figure Eight Blind Flange B16.48

ASTM A182 F53 Super Duplex Steel Spectacle Figure Eight Blind Flange B16.48

A Spectacle Figure Eight Blind Flange (commonly called a Spectacle Blind Flange) per ASME B16.48 is a piping component used to either fully open or fully close a pipeline. It consists of two discs connected by a small section of metal—one solid plate (to block flow) and one with a hole (to allow flow). The flange is typically rotated to switch between open and closed positions.

Key Features:

• Standard: ASME B16.48
• Material: Carbon steel, stainless steel, alloy steel, or other specified materials
• Pressure Ratings: 150#, 300#, 600#, 900#, 1500#, and 2500#
• Sizes: Typically ranges from ½” to 24”
• Application: Used in pipelines to isolate sections for maintenance, testing, or system modifications

A Spectacle Blind Flange is a safety device used in piping systems to either allow or block flow. It consists of two metal discs connected by a bar: One side is a solid blind (to stop flow). The other side is a ring spacer (to allow flow). It is typically rotated between these two positions during maintenance or system isolation. Materials: Carbon steel (ASTM A105), stainless steel (ASTM A182 F316/F304), alloy steel, duplex, and special alloys

Applications:

• Temporary or permanent pipeline isolation
• Shutdowns, maintenance, or hydro testing
• Used in industries like oil & gas, petrochemical, and power plants

Test Certificate

Manufacturer Test Certificate as per EN 10204 / 3.1B