Reliable Spectacle Blind Flanges Manufacturer & Supplier in India
Spectacle Blind Flanges, also known as figure-8 flanges, are a safety device used to isolate a section of pipeline for maintenance or inspection. They consist of a solid plate and a ring (or spacer) connected together in a figure-8 shape. One end blocks the flow completely (blind), while the other end allows flow through the pipe (spacer). They are manually rotated to alternate between flow and shut-off, making them ideal for applications where positive isolation is required periodically.
Vardhman Steel Overseas offers high-performance Spectacle Blind Flanges manufactured to ANSI, ASME, DIN, BS, and AWWA standards. These flanges are available in a range of premium materials like Stainless Steel, Carbon Steel, Alloy Steel, Duplex, Super Duplex, Copper-Nickel, and Nickel Alloys, in sizes from ½” to 48” and pressure classes from 150# to 2500#.
Spectacle blinds are widely used in oil & gas, chemical processing, power plants, petrochemical units, and water treatment plants, ensuring operational safety during maintenance or shutdowns. Their robust design, high-temperature resistance, and corrosion-proof material make them ideal for critical pipeline systems.
Choose Vardhman Steel Overseas for accurate, corrosion-resistant Spectacle Blind Flanges built to provide reliable isolation and meet stringent international specifications.
Available Materials & Grades
We supply Spectacle Blind Flanges in various materials and grades to meet diverse process requirements and fluid conditions.
| Material | Specifications / Grades |
|---|---|
| Stainless Steel | ASTM A182, A240 – F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L |
| Duplex & Super Duplex Steel | ASTM/ASME A/SA182 – F44, F45, F51, F53, F55, F60, F61 |
| Carbon Steel | ASTM/ASME A/SA105, A350, A181 LF2, A516 Gr.70, A36, A694 – F42, F46, F52, F60, F65, F706 |
| Low Temperature Carbon Steel | ASTM A350 – LF2, LF3 |
| Alloy Steel | ASTM/ASME A/SA182 & A387 – F1, F5, F9, F11, F12, F22, F91 |
| Copper Alloy Steel | ASTM SB61, SB62, SB151, SB152 – UNS C70600 (Cu-Ni 90/10), C71500 (Cu-Ni 70/30), C10100, C10200, C10300, C10800, C12000, C12200 |
| Nickel Alloy | ASTM SB564, SB160, SB472, SB162 – Nickel 200 (N02200), Nickel 201 (N02201), Monel 400 (N04400), Monel K500 (N05500), Inconel 600 (N06600), 601 (N06601), 625 (N06625), 800 (N08800), 825 (N08825), Hastelloy C276 (N10276), Alloy 20 (N08020) |
Spectacle Blind Flange – Technical Specifications
Explore our specification table for Spectacle Blind Flanges manufactured by Vardhman Steel Overseas in compliance with global quality standards.
| Specification Parameter | Details |
|---|---|
| Product Name | Spectacle Blind Flange |
| Size Range | ½” NB to 48” NB (15mm to 1200mm) |
| Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500, DIN ND-6 to ND-40 |
| Flange Face Type | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
| Applicable Standards | ANSI B16.5, B16.47 Series A & B, MSS SP44, API 605, AWWA, Custom Drawings |
| DIN Standards | DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655, DIN2656, DIN2627–2629, DIN2631–2638, DIN2673 |
| BS Standards | BS4504, BS1560, BS10 |
| Manufacturing Method | Forged / Machined |
| Testing & Certification | Hydro Testing, PMI, UT, RT, MTC as per EN 10204 3.1 / 3.2, Third-Party Inspection (TPI) |
Features & Benefits
Spectacle Blind Flanges from Vardhman Steel Overseas are used to provide positive isolation of piping systems. Designed as a figure-8 device, they allow safe maintenance operations and prevent flow through the pipeline when required. They offer high safety, durability, and versatility for critical pipeline applications.
- Positive Flow Isolation – Used to completely shut off the pipeline during maintenance or testing.
- Figure-8 Design – Combines a solid blank and open spacer for easy switching between closed and open positions.
- Manual Rotation Mechanism – Enables fast and safe rotation between blind and spacer sides.
- Leak-Proof Seal – Ensures tight sealing with proper bolting and gaskets.
- Rugged Construction – Forged and machined to withstand high pressure and temperature environments.
- Multiple Facing Options – Available in RF, RTJ, and FF types for different sealing needs.
- Corrosion Resistant – Offered in stainless, duplex, and exotic alloys for chemical resistance.
- ANSI, ASME, DIN, BS Compliant – Manufactured as per leading international flange standards.
- Easy Maintenance – Provides safe isolation without dismantling the pipeline system.
- Widely Used – Ideal for oil & gas, petrochemical, refineries, marine, and process plants.