Stainless Steel Flange ASME B16.48 SA-182 F51 Spectacle Blank Flange
ASME B16.48 ASTM A182 F51 Spectacle Blind Flange | Duplex Stainless Steel Figure-8 Flange Manufacturer
SSM supplies high-quality ASME B16.48 ASTM A182 F51 Spectacle Blind Flanges, also known as Figure-8 Blinds, made from Duplex Stainless Steel F51 (UNS S31803). These flanges are designed for pipeline isolation, ensuring safe maintenance and operation in high-pressure and corrosive environments.
What is an ASME B16.48 Spectacle Blind Flange?
A Spectacle Blind Flange consists of two metal discs joined together – one side is a solid blind (for blocking flow), and the other is a ring (for allowing flow). By rotating the assembly, the pipeline can be opened or closed without completely removing the flange connection.
This design makes it ideal for systems that require frequent maintenance or inspection.
The ASME B16.48 standard covers dimensions, tolerances, pressure-temperature ratings, and marking requirements for spectacle blinds, spades, and ring spacers used with flanges in the size range of NPS ½" to NPS 24" and pressure classes from 150# to 2500#.
Material: ASTM A182 F51 (Duplex Stainless Steel)
ASTM A182 F51, also known as Duplex 2205 or UNS S31803, is a duplex stainless steel combining the advantages of ferritic and austenitic structures.
Key Properties:
Excellent resistance to pitting and crevice corrosion.
High tensile strength (~620 MPa) and yield strength (~450 MPa).
Good resistance to chloride-induced stress corrosion cracking.
Suitable for temperatures up to approximately 315°C.
This material is widely used in marine, petrochemical, offshore, and chemical processing industries.
Technical Specifications
| Parameter | Description |
|---|---|
| Standard | ASME B16.48 |
| Material | ASTM A182 F51 / UNS S31803 (Duplex Stainless Steel) |
| Type | Spectacle Blind (Figure-8) |
| Size Range | ½" – 24" (custom sizes available) |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Face Type | Raised Face (RF), Flat Face (FF), or Ring Type Joint (RTJ) |
| Manufacturing Process | Forged and solution annealed |
| Testing | PMI, Mechanical Test, Heat Treatment Report, NDT (on request) |
Applications
Oil & Gas pipelines
Petrochemical plants
Offshore platforms
Power generation systems
Desalination and marine industries
Why Choose SSM?
30+ years of experience in manufacturing and supplying forged flanges.
Strict quality control in accordance with ASME, ASTM, EN, and ISO standards.
Customized production available for non-standard dimensions and special alloys.
Fast delivery and global export capability.
Conclusion
The ASME B16.48 ASTM A182 F51 Spectacle Blind Flange is an essential component for pipeline isolation and safety control. With its superior corrosion resistance and mechanical strength, it performs reliably in harsh environments.
SSM offers complete solutions with high-quality duplex stainless steel spectacle blinds tailored to your project requirements.
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