ASTM A182 F316L Stainless Steel Blind Spectacle Flange (Figure-8 Blank) B16.48,

Product Specification

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ASTM A182 F316L Stainless Steel Blind Spectacle Flange (Figure-8 Blank) B16.48, Class 150# to 2500#

This product is a one-piece line blank conforming to ASME B16.48, commonly known as a figure-8 blank or spectacle blind due to its distinctive shape. It is forged from ASTM A182 F316L low-carbon austenitic stainless steel and consists of a solid blind end and a ring spacer end connected by a web. Installed between pipe flanges, the blind can be rotated to provide either absolute physical isolation (Blind Flange End) or full-bore flow passage (Throttling Ring End). The F316L material, containing molybdenum and having very low carbon content, offers excellent resistance to intergranular corrosion, pitting, and chloride stress corrosion cracking. It is therefore well-suited for aggressive environments such as offshore applications, chloride-bearing media, or acidic fluid services. The design fully complies with ASME B16.48 dimensional, tolerancing, and facing requirements (RF, FF, RTJ...). This component is a critical device in the oil, gas, chemical, petrochemical, and nuclear power industries for ensuring safe isolation and reliable operation of piping systems.

ASTM A182 F316L

• ASTM A182 F316L is most used for stainless steel flange, includes weld neck flange, slip on flange, blind flange, socket weld flange and etc.
• Either alloy steel or stainless steel flange dimensions available for the OD up to 48 inch, class pressure from 150# to 2500#.

B16.48 Standard

• This standard covers the design, material, and testing requirements for spectacle blind flanges used in piping systems.
• This standard defines the dimensions, tolerances, and other mechanical properties to ensure uniformity and compatibility across different systems.
• B16.48 is part of the ASME B16 series, which also covers other piping components like flanges and fittings.
• The B16.48 standard ensures that the spectacle blind flanges are dimensionally correct and safe to use in high-pressure or critical applications.

1.Chemical & Mechanical Properties

Mechanical Properties

2. Key Adventages

• ASTM A182 F316L low-carbon molybdenum-bearing austenitic stainless steel offers excellent resistance to intergranular corrosion, pitting, and chloride stress corrosion cracking, ideal for seawater, sour service, and chloride-containing environments.
• One-piece forged construction eliminates welded joints, removing heat-affected zones and potential crack risks, capable of withstanding high pressure, high temperature, and cyclic loading.
• Provides complete positive isolation via the solid blind end. No reliance on valve seats or seals, eliminating any risk of internal leakage and ensuring safe maintenance

3. Key Applications

• Piping systems in chemical, petrochemical, and marine applications where high resistance to corrosion, especially from chloride, is required.
• Isolation of pipelines for maintenance or repair.
• High-pressure and high-temperature environments where the flange must withstand harsh operating conditions.
• Systems requiring frequent maintenance where isolating and restoring the flow is often necessary.

4. Package

• Each bundle covered with plastic for protection against extreme weather.
• End of ASTM A182 F316L Flanges protected by plastic caps.
• Bundles strapped with plastic strips.
• Each radius of U-Bend tube separated by a separator.
• Packaging list (laminated) placed with box/crate.