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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
YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9...
YUHONG HOLDING GROUP is one of the largest Procurement, Engineering & Contracting Group companies in China. Our group branch company and factory have been already approved by : ABS, LR, DNV, GL, BV, CCS, KR, PED 97/23/EC, AD2000-WO, GOST9941-81, CCS, TS, CNNC, ISO9...