Spectacle Blind Flanges
| Specification | Details |
|---|---|
| Product Name | Spectacle Blind Flanges |
| Material Grade | Carbon Steel / Stainless Steel / Alloy Steel / Nickel Alloys / Titanium / Duplex Stainless Steel, as applicable |
| Material Type | Forged Metallic Flange / Spectacle Blind Assembly |
| Manufacturing Type | Forged / Hot Forged / Precision Machined |
| Flange Standard | ASME B16.48 / ASME B16.5 and other applicable standards |
| Material Standards | ASTM / ASME / EN / DIN / JIS and other applicable specifications |
| Size | 1/2″ to 24″ or As per Customer Requirement |
| Pressure Class | Class 150 / 300 / 600 / 900 / 1500 / 2500, as applicable |
| Connection Type | Bolted Flanged Connection |
| Configuration | Spectacle Plate with Blind and Spacer Sections |
| Facing Type | Raised Face / Flat Face / Ring Type Joint, as applicable |
| Bore Type | Standard Bore / Customized Bore |
| Surface Finish | Machined / Polished / As Specified |
| Dimensions | As per ASME B16.48 / Applicable Flange Standards and Customer Requirements |
| Heat Treatment | As per Applicable Material Specification |
| MTC | EN 10204 3.1 / 3.2 |
| Testing | Chemical / Mechanical / Dimensional / Hardness / Visual / PMI and Other Tests as Required |
| Tensile Strength | As per Applicable Material Specification and Grade |
| Yield Strength | As per Applicable Material Specification and Grade |
| Elongation | As per Applicable Material Standard |
| Corrosion Resistance | Depends on the Selected Material Grade and Service Environment |
| High-Temperature Performance | Depends on Material Grade and Applicable Service Limits |
| Welding | Not normally required for installation; applicable welding may be used during manufacturing as specified |
| Fabrication | Suitable for precision machining and fabrication using grade-specific procedures |
| Dimensional Accuracy | Precision dimensions according to applicable spectacle blind and flange standards |
| Customization | Size / Material Grade / Pressure Class / Facing / Bore / Dimensions / Finish / Testing and Documentation |
| Inspection | Dimensional / Visual and Material Inspection as Required |
| Marking | Size / Grade / Standard / Class / Facing and Heat/Batch Identification as Applicable |
| Origin | European / American / Japanese / Korean and Other Approved Origins |
| Export Supply | Worldwide Spectacle Blind Flanges Export Supply |
| Exporter Support | Technical Specifications / Inspection / Certification / Export Packing / Documentation and International Shipment Coordination |
| Applications | Oil & Gas / Petrochemical / Chemical Processing / Refineries / Power Generation / Marine / Water Treatment / Process Piping and Industrial Systems |
1. Most Common Types of Spectacle Blind Flanges
| Type | Details |
|---|---|
| Standard Spectacle Blind Flanges | Combines a solid blind section and an open spacer section in a single plate, allowing the line to be isolated or opened by rotating the assembly. |
| Raised Face Spectacle Blind Flanges | Designed with a raised sealing face for use with suitable gaskets in standard industrial piping systems. |
| Flat Face Spectacle Blind Flanges | Features a flat sealing surface for compatible flat-face piping arrangements. |
| Ring Type Joint Spectacle Blinds | Designed with an RTJ sealing configuration for suitable high-integrity connections in demanding pressure services. |
| Carbon Steel Spectacle Blind Flanges | Commonly used in oil & gas, petrochemical, refinery and general industrial piping systems. |
| Stainless Steel Spectacle Blind Flanges | Suitable for piping systems requiring enhanced corrosion resistance and reliable mechanical performance. |
| Alloy Steel Spectacle Blind Flanges | Used where higher strength and suitable elevated-temperature performance are required. |
| Duplex Spectacle Blind Flanges | Provides high mechanical strength with good resistance to chloride corrosion, pitting and stress-corrosion cracking. |
| Super Duplex Spectacle Blind Flanges | Suitable for demanding marine, seawater and corrosive process environments requiring enhanced localized corrosion resistance. |
| Nickel Alloy Spectacle Blind Flanges | Used in chemical and aggressive process environments requiring specialized nickel alloy properties. |
| Titanium Spectacle Blind Flanges | Suitable for applications requiring lightweight construction and excellent corrosion resistance. |
| Customized Spectacle Blind Flanges | Manufactured according to customer drawings, material grade, size, pressure class, facing, dimensions and testing requirements. |
2. Spectacle Blind Flanges – Technical Specifications
| Specification | Details |
|---|---|
| Product Name | Spectacle Blind Flanges |
| Material Grade | Carbon Steel / Stainless Steel / Alloy Steel / Nickel Alloys / Titanium / Duplex Stainless Steel, as applicable |
| Material Type | Forged Metallic Flange / Spectacle Blind Assembly |
| Manufacturing Type | Forged / Hot Forged / Precision Machined |
| Flange Standard | ASME B16.48 / ASME B16.5 and other applicable standards |
| Material Standards | ASTM / ASME / EN / DIN / JIS and other applicable specifications |
| Size | 1/2″ to 24″ or As per Customer Requirement |
| Pressure Class | Class 150 / 300 / 600 / 900 / 1500 / 2500, as applicable |
| Connection Type | Bolted Flanged Connection |
| Configuration | Spectacle Plate with Blind and Spacer Sections |
| Facing Type | Raised Face / Flat Face / Ring Type Joint, as applicable |
| Bore Type | Standard Bore / Customized Bore |
| Surface Finish | Machined / Polished / As Specified |
| Dimensions | As per ASME B16.48 / Applicable Flange Standards and Customer Requirements |
| Heat Treatment | As per Applicable Material Specification |
| MTC | EN 10204 3.1 / 3.2 |
| Testing | Chemical / Mechanical / Dimensional / Hardness / Visual / PMI and Other Tests as Required |
| Tensile Strength | As per Applicable Material Specification and Grade |
| Yield Strength | As per Applicable Material Specification and Grade |
| Elongation | As per Applicable Material Standard |
| Corrosion Resistance | Depends on the Selected Material Grade and Service Environment |
| High-Temperature Performance | Depends on Material Grade and Applicable Service Limits |
| Welding | Not normally required for installation; manufacturing welds, where applicable, are performed according to the material specification |
| Fabrication | Suitable for precision machining and fabrication using grade-specific procedures |
| Dimensional Accuracy | Precision dimensions according to applicable spectacle blind and flange standards |
| Customization | Size / Material Grade / Pressure Class / Facing / Bore / Dimensions / Finish / Testing and Documentation |
| Inspection | Dimensional / Visual and Material Inspection as Required |
| Marking | Size / Grade / Standard / Class / Facing and Heat/Batch Identification as Applicable |
| Origin | European / American / Japanese / Korean and Other Approved Origins |
| Export Supply | Worldwide Spectacle Blind Flanges Export Supply |
| Exporter Support | Technical Specifications / Inspection / Certification / Export Packing / Documentation and International Shipment Coordination |
| Applications | Oil & Gas / Petrochemical / Chemical Processing / Refineries / Power Generation / Marine / Water Treatment / Process Piping and Industrial Systems |
3. Spectacle Blind Flanges – Supply & Quality Details
| Parameter | Details |
|---|---|
| Material Identification | As per Selected Material Grade and Applicable Specification |
| Flange Configuration | Spectacle Blind / Spacer and Blind Combination |
| Size Range | 1/2″ to 24″ or As per Requirement |
| Pressure Classes | Class 150 / 300 / 600 / 900 / 1500 / 2500 |
| Applicable Standards | ASME B16.48 and applicable ASTM, ASME, EN, DIN or JIS specifications |
| Facing Options | Raised Face / Flat Face / Ring Type Joint |
| Bore Options | Standard Bore / Customized Bore |
| Surface Finish | Machined / Polished / As Specified |
| Heat Treatment | As per Applicable Material Specification |
| Testing | Chemical / Mechanical / Dimensional / Hardness / Visual / PMI / Other Tests |
| Inspection | Dimensional / Visual and Material Inspection |
| Certification | EN 10204 3.1 / 3.2 |
| Marking | Size / Grade / Standard / Class / Facing and Heat/Batch Identification |
| Material Traceability | Heat Number and Batch Identification as Applicable |
| Customization | Material / Size / Pressure Class / Facing / Bore / Dimensions / Finish / Testing |
| Packaging | Export-Worthy Wooden Cases, Boxes, Pallets or Customized Packaging |
| Documentation | MTC / Inspection Reports / Test Certificates and Other Documents as Required |
| Export Supply | Worldwide Spectacle Blind Flanges Supply |
| Applications | Oil & Gas / Petrochemical / Chemical Processing / Refinery / Power Generation / Marine / Water Treatment / Process Piping and Industrial Systems |
Most Common Types Of Spectacle Blind Flanges
| Type | Details |
|---|---|
| Standard Spectacle Blind Flanges | A combined spacer and blind plate design used to open or isolate a piping line by rotating the assembly between the connected flanges. |
| Raised Face Spectacle Blind Flanges | Manufactured with a raised sealing face and suitable for compatible gasketed piping connections. |
| Flat Face Spectacle Blind Flanges | Features a flat sealing surface and is used with compatible flat-face flange arrangements. |
| Ring Type Joint Spectacle Blind Flanges | Designed with an RTJ sealing arrangement for suitable high-pressure and high-integrity piping applications. |
| Carbon Steel Spectacle Blind Flanges | Commonly used in oil & gas, refinery, petrochemical, water treatment and general industrial piping systems. |
| Stainless Steel Spectacle Blind Flanges | Suitable for applications requiring improved corrosion resistance and reliable mechanical performance. |
| Alloy Steel Spectacle Blind Flanges | Used where higher mechanical strength and suitable elevated-temperature performance are required. |
| Duplex Spectacle Blind Flanges | Provides high strength and good resistance to chloride corrosion, pitting and stress-corrosion cracking. |
| Super Duplex Spectacle Blind Flanges | Suitable for demanding marine, seawater and highly corrosive process environments. |
| Nickel Alloy Spectacle Blind Flanges | Used in aggressive chemical and process environments where specialized nickel alloy corrosion resistance is required. |
| Titanium Spectacle Blind Flanges | Suitable for applications requiring lightweight construction and excellent resistance to seawater and corrosive environments. |
| Customized Spectacle Blind Flanges | Manufactured according to customer drawings and specified material grade, size, pressure class, facing, dimensions and inspection requirements. |
Why Should You Buy Spectacle Blind Flanges from Metalx Nickel & Alloys?
- Experienced Spectacle Blind Flanges Supplier & Exporter serving international buyers, importers, distributors, EPC contractors, stockholders, traders and industrial end users.
- 20+ Years of Flange & Alloy Industry Experience in supplying and exporting high-performance, corrosion-resistant and specialty alloy flanges to customers across the UAE, Saudi Arabia, Qatar, Oman, Kuwait, Bahrain, Africa, Europe, Asia and other global markets.
- Specialized Spectacle Blind Flanges Exporter offering Spectacle Blind Flanges in carbon steel, stainless steel, alloy steel, nickel alloys, titanium, duplex and other suitable materials according to applicable international standards and customer requirements.
- Global Spectacle Blind Flanges Sourcing Network with access to reputed mills, manufacturers, authorized suppliers and approved stockholders across the USA, Europe, Japan, South Korea and other major international supply markets.
- Reliable Spectacle Blind Flanges Supplier providing flanges for piping systems requiring positive line isolation, reliable sealing, dimensional accuracy, convenient flow-path changeover and dependable performance under suitable pressure and temperature conditions.
- Wide Specialty Flanges Range including Spectacle Blind Flanges, Weld Neck Flanges, Slip-On Flanges, Blind Flanges, Socket Weld Flanges, Threaded Flanges, Lap Joint Flanges, Orifice Flanges, Stainless Steel Spectacle Blind Flanges, Carbon Steel Spectacle Blind Flanges, Duplex Spectacle Blind Flanges, Super Duplex Spectacle Blind Flanges, Nickel Alloy Spectacle Blind Flanges and Titanium Spectacle Blind Flanges.
| Key Feature | Details |
|---|---|
| Positive Pipeline Isolation | Provides a reliable physical barrier for complete isolation of a pipeline section during maintenance and shutdown operations. |
| Easy Flow Selection | The figure-8 design allows the spacer and blind sections to be positioned according to whether the pipeline needs to remain open or isolated. |
| Visible Isolation | The spectacle configuration provides a clearly visible indication of the open or closed position of the pipeline. |
| Robust Construction | Manufactured from suitable materials to provide mechanical strength, dimensional stability and dependable service performance. |
| Wide Material Availability | Available in stainless steel, carbon steel, alloy steel, duplex, super duplex, nickel alloys and other specialized materials. |
| Multiple Pressure Ratings | Available in Class 150, 300, 600, 900, 1500 and 2500 LB configurations, subject to applicable requirements. |
| Multiple Facing Options | RF, FF and RTJ configurations can be supplied according to the mating flange and application. |
| Maintenance Friendly | Allows pipeline isolation during inspection, repair, cleaning, modification and shutdown activities. |
| Corrosion Resistance | Suitable material grades can be selected for corrosive media, marine environments and demanding process conditions. |
| High-Temperature Capability | Performance depends on the selected material grade and applicable operating temperature limits. |
| Custom Manufacturing | Size, material grade, thickness, facing, dimensions and other specifications can be customized according to drawings or project requirements. |
| Dimensional Accuracy | Manufactured with attention to flange dimensions, bolt-hole alignment, thickness and facing requirements. |
| Industrial Compatibility | Suitable for oil & gas, refinery, petrochemical, chemical, power, water treatment, marine and offshore piping systems. |
| Inspection & Documentation | Dimensional, visual and material inspection along with required certification can be provided. |
| Export Supply | Available for domestic and international industrial projects with suitable export packaging and documentation. |
| Specification | Details |
|---|---|
| Product Name | Spectacle Blind Flanges |
| Material Grades | Stainless Steel / Carbon Steel / Alloy Steel / Duplex & Super Duplex / Nickel Alloys / Inconel / Monel / Hastelloy / Incoloy / Titanium |
| Size Range | Commonly 1/2″ to 24″ and Larger Sizes on Request |
| Pressure Classes | 150 / 300 / 600 / 900 / 1500 / 2500 LB |
| Standards | ASME B16.48 / ASME B16.5 / ASME B16.47 and Applicable Project Specifications |
| Facing | Raised Face (RF) / Flat Face (FF) / Ring Type Joint (RTJ) |
| Manufacturing Type | Forged and Fabricated as per Size, Material and Application Requirements |
| Shape | Figure-8 or Spectacle Configuration |
| Connection | Flanged Piping Connection |
| Inspection | Dimensional / Visual and Material Inspection as Applicable |
| Surface Finish | Machined / As Specified by Customer or Applicable Standard |
| Dimensions | As per Applicable Standards and Customer Drawings |
| Material Selection | Based on Operating Pressure, Temperature, Fluid Characteristics and Corrosion Conditions |
| Customization | Material Grade / Size / Thickness / Facing / Dimensions and Other Project Requirements |
| Documentation | Material Test Certificates and Inspection Documents as Required |
| Export Availability | Domestic and International Industrial Supply |
| Applications | Pipeline Isolation / Maintenance / Process Plants / Refineries / Petrochemical / Oil & Gas / Power Plants / Water Treatment / Shipbuilding / Offshore and General Industrial Piping |
1. What are Spectacle Blind Flanges?
Spectacle Blind Flanges are figure-8 shaped piping components consisting of a spacer section and a blind section. They are used to either maintain normal flow or provide positive physical isolation of a pipeline.
2. What standards are used for Spectacle Blind Flanges?
Spectacle Blind Flanges are commonly manufactured according to ASME B16.48 , with ASME B16.5, ASME B16.47 and applicable project specifications used where relevant.
3. What materials are available for Spectacle Blind Flanges?
They can be supplied in Carbon Steel, Stainless Steel, Alloy Steel, Duplex, Super Duplex, Nickel Alloys, Inconel, Monel, Hastelloy, Incoloy and Titanium , depending on the application requirements.
4. What pressure classes are available?
Common pressure classes include 150, 300, 600, 900, 1500 and 2500 LB , subject to the applicable size, material and project specification.
5. What are the facing options available?
Spectacle Blind Flanges can be supplied with Raised Face (RF), Flat Face (FF) and Ring Type Joint (RTJ) configurations according to the mating flange and piping requirements.
6. Where are Spectacle Blind Flanges commonly used?
They are widely used in oil gas pipelines, refineries, petrochemical plants, chemical processing units, power plants, water treatment facilities, shipbuilding, offshore installations and general process piping , particularly where positive pipeline isolation is required during maintenance or shutdown operations.