Flange Fittings
Spectacle Blind Flanges
Precision-engineered spectacle blind flanges designed for convenient pipe isolation, reliable flow control and demanding industrial and process piping applications.
Product Type:
Spectacle Blind Flanges / Spectacle Blinds
Size Range:
1/2" NB to 48" NB
Standards:
ASME / ANSI / ASTM
Pressure Class:
150 to 2500 LBS
Application:
Industrial, Process & High-Pressure Piping
About This Product
Spectacle Blind Flanges
GS MetalFit supplies spectacle blind flanges designed for positive isolation and controlled flow arrangements in industrial and process piping systems. A spectacle blind consists of a solid blind section and an open section connected by a web or handle, allowing the flow path to be changed by rotating the assembly between the open and closed positions.
Spectacle blind flanges can be installed between existing flanges without requiring welding to the pipe, making them suitable for piping systems where regular isolation or maintenance access is required.
Our range is available in stainless steel, carbon steel, alloy steel, duplex and super duplex steel, nickel alloys and copper-nickel materials. Products can be supplied in different sizes, pressure classes, material grades, face configurations and dimensions according to specified project requirements.
Product Forms
Spectacle Blind
Figure 8 Flange
Figure 8 Blind
Spectacle Blind Plate
Spectacle Blind Raised Face
Spectacle Blind Flat Face
Spectacle Blind RTJ
Stainless Steel Spectacle Blind
Carbon Steel Spectacle Blind
Alloy Steel Spectacle Blind
Duplex Steel Spectacle Blind
Super Duplex Spectacle Blind
Nickel Alloy Spectacle Blind
Copper Nickel Spectacle Blind
Technical Specifications
Materials & Grades
Stainless Steel Spectacle Blind Flanges
Available in ASTM A182 / A240 grades including F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H and 904L.
Duplex & Super Duplex Steel Spectacle Blind Flanges
Available in ASTM / ASME A/SA182 grades including F44, F45, F51, F53, F55, F60, F61, 2205 (UNS S31803) and 2507 (UNS S32750).
Carbon Steel Spectacle Blind Flanges
Available in ASTM / ASME A/SA105, A350, A181 LF2, A516 Grade 70, A36 and A694 grades including F42, F46, F52, F60, F65, F70, LF2 and LF3.
Alloy Steel Spectacle Blind Flanges
Available according to applicable ASTM / ASME A/SA182 and A387 specifications including grades F1, F5, F9, F11, F12, F22 and F91.
Copper & Cupro Nickel Spectacle Blind Flanges
Available in selected copper and copper-nickel grades including UNS C10100, C10200, C10300, C10800, C12000, C12200, C70600 and C71500, including Cu-Ni 90/10 and Cu-Ni 70/30 grades.
Nickel Alloy Spectacle Blind Flanges
Available in ASTM / ASME SB564, SB160, SB472 and SB162 materials including Nickel 200, Nickel 201, Monel 400, Monel K500, Inconel 600, Inconel 601, Inconel 625, Inconel 800, Inconel 825, Hastelloy C276 and Alloy 20.
Applications
Industrial Piping Systems
Process Piping
Oil & Gas Facilities
Chemical & Petrochemical Plants
Refineries & Industrial Plants
Power Generation Projects
Marine & Offshore Applications
General Engineering & Fabrication
Why Choose GS MetalFit?
Wide Material Selection
Spectacle blind flanges are available in stainless steel, carbon steel, alloy steel, duplex, super duplex, nickel alloys and copper-nickel grades.
Practical Isolation Design
The open and blind sections allow the piping flow path to be changed between operating and isolated positions when the system is properly shut down and prepared for the required maintenance procedure.
Multiple Pressure Classes
Products can be supplied in pressure classes from 150 LBS to 2500 LBS according to specified requirements.
Different Face Configurations
Flat Face, Raised Face and Ring Type Joint configurations can be supplied according to piping and flange requirements.
Project-Based Specifications
Size, material grade, dimensions, pressure class, face configuration and applicable standards can be selected according to customer drawings and technical specifications.
Spectacle Blind Flanges Manufacturer & Supplier
GS MetalFit supplies Spectacle Blind Flanges, Spectacle Blinds and Figure 8 Flanges for industrial, process and high-pressure piping applications. These assemblies combine an open section and a solid blind section, allowing the piping system to be configured for normal flow or positive isolation as required.
Spectacle blind flanges are commonly used in piping systems where isolation points are required for maintenance, inspection or operational purposes. The assembly can be rotated between the open and closed positions after the piping system has been safely isolated.
Our spectacle blind range includes stainless steel, carbon steel, alloy steel, duplex, super duplex, nickel alloy and copper-nickel materials. Products can be supplied in different sizes, pressure classes, face configurations, material grades and dimensions according to specified project requirements.
Stainless Steel Spectacle Blind Flanges
GS MetalFit supplies stainless steel spectacle blinds in commonly specified grades such as 304, 304L, 316, 316L, 321, 347, 904L and other applicable grades. These materials can be selected for piping systems where corrosion resistance and dependable service performance are important.
Carbon Steel & Alloy Steel Spectacle Blind Flanges
Carbon steel and alloy steel spectacle blinds are available for applications where mechanical strength and pressure-handling capability are important. Material options include ASTM A105, A350, A182 and A387 grades, subject to specified project requirements.
Duplex, Super Duplex & Nickel Alloy Spectacle Blinds
For demanding process environments, GS MetalFit supplies duplex, super duplex and nickel alloy spectacle blind flanges in materials such as UNS S31803, UNS S32205, UNS S32750, Nickel 200, Monel 400, Monel K500, Inconel 600, Inconel 625, Inconel 825, Hastelloy C276 and Alloy 20.
These material options can be considered for applications involving corrosive process media, elevated temperatures and other specialized industrial operating conditions.
Spectacle Blind Flanges for Industrial Project Requirements
GS MetalFit supports enquiries for Spectacle Blind Flanges used in oil and gas facilities, refineries, chemical and petrochemical plants, power projects, process industries, marine applications and general engineering systems.
Products can be supplied according to specified size, pressure class, material grade, face configuration, dimensions, applicable standards and customer drawings.