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Spectacle Blind Flange (Figure-8 Blind) – ASME B16.48

Materials: Stainless Steel (SUS304/316), Carbon Steel (A516/A105) & More

Expert Product Overview: Ensuring Pipeline Safety and Integrity

A Spectacle Blind, also known as a Figure-8 Blind, is a critical safety device used to isolate sections of a pipeline or equipment. It consists of two discs—a solid “blind” disc and an open “spacer” disc-connected by a small web or handle.

• For Isolation (Blind Side): When maintenance or shutdown is required, the solid blind side is rotated into the pipeline, providing a positive, visible stop that is far safer than relying on a valve alone.
• For Operation (Spacer Side): During normal operation, the open spacer side is positioned in the line, ensuring uninterrupted flow with a negligible pressure drop.

This simple, robust design is essential for ensuring the absolute safety of personnel during maintenance and preventing accidental flow in critical process systems.

Our Commitment to Quality & Compliance

We are committed to supplying industrial components that meet the highest standards of quality and safety. You can trust our spectacle blinds for your most critical applications.

• Authoritative Standards: All our spectacle blinds are manufactured and dimensionally controlled in strict accordanceance with ASME B16.48, the leading international standard for line blanks. This guarantees correct fitment, pressure handling, and material specifications for their designated class.
• Verified Material Traceability: We supply materials with full traceability. All products can be shipped with a Material Test Report (MTR) or Mill Test Certificate (MTC), ensuring the chemical and mechanical properties of the steel meet ASTM standards (e.g., ASTM A516 Gr.70, ASTM A105, SUS304).
• Manufacturing Expertise: With sourcing capabilities from leading manufacturers in Japan and Indonesia, we offer a flexible supply chain to meet your project’s specific requirements for lead time, budget, and origin. Our experience ensures you receive a product that is fit-for-purpose and built to last.

Product Specifications

Dimensional Data: ASME B16.48 – Class 150 (Sample)

The following table provides standard dimensions for Class 150 Spectacle Blinds. Please contact us for a full dimensional datasheet for all sizes and pressure classes.

Request a Quote

For a prompt and accurate quotation, please contact our sales team today. Include the following details in your inquiry:

• Size (e.g., 4 inch)
• Pressure Class (e.g., ANSI 150)
• Material (e.g., SUS304)
• Quantity