Spectacle Blind Flange
Spectacle Blind Flanges
Precision-engineered Spectacle Blind Flanges designed for positive isolation, reliable line blanking and safe flow control in demanding industrial piping systems.
- Spectacle Blind Flanges
- ANSI / ASME
- DIN / BS / EN
- FF / RF / RTJ
- 150–2500 LBS
- Industrial Piping
Spectacle Blind Flanges Manufacturer & Supplier
Sawariya Metal Industries is engaged in the manufacturing, supplying, stockholding and exporting of industrial flanges and piping components for a wide range of applications. Our Spectacle Blind Flanges are designed for positive isolation and line blanking where reliable separation of process flow is required.
Spectacle Blind Flanges are manufactured in a figure-eight configuration, combining a solid blind section and an open spacer section. This design allows the pipeline to be positively isolated or opened by rotating the spectacle blind according to the operating requirement.
These flanges are available in multiple materials, pressure classes, dimensions and face configurations to suit different industrial piping requirements. Applications include process plants, oil & gas, petrochemical, chemical, power generation, marine, sugar, defence and general fabrication industries.
Key Features
Positive Isolation
Designed for dependable physical isolation of piping lines.
Figure-Eight Design
Integrated blind and spacer arrangement for practical operation.
Pressure Classes
Available across multiple ASME pressure classes and DIN ratings.
Multiple Materials
Stainless, duplex, alloy, carbon and nickel alloy options.
Spectacle Blind Flanges Specifications
Dimensions
ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges and custom dimensions.
Standards
ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA and custom drawings.
Pressure Class
150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS and 2500 LBS.
DIN Pressure Ratings
ND-6, ND-10, ND-16, ND-25 and ND-40.
Size Range
1/2″ (15 NB) to 48″ (1200 NB).
Flange Face
Flat Face (FF), Raised Face (RF) and Ring Type Joint (RTJ).
Applicable Standards
DIN Standards
DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629, DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638 and DIN 2673.
ANSI / ASME Standards
ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36 and ANSI B16.48.
BS Standards
BS 4504, BS 1560 and BS 10.
Materials & Grades
Stainless Steel
ASTM A182 / A240 F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H and 904L.
Duplex & Super Duplex
ASTM / ASME A/SA 182 F44, F45, F51, F53, F55, F60 and F61.
Alloy Steel
ASTM / ASME A/SA 182 and A387 F1, F5, F9, F11, F12, F22 and F91.
Carbon Steel
ASTM / ASME A/SA 105, A350, A181 LF2, A516 Gr.70, A36, A694 F42, F46, F52, F60, F65 and F706.
Nickel Alloys
ASTM SB564, SB160, SB472, SB162; Nickel 200/201, Monel 400/500, Inconel 600/601/625/800/825, Hastelloy C276 and Alloy 20.
Copper Alloys
ASTM SB61, SB62, SB151, SB152; Cu-Ni 90/10, Cu-Ni 70/30 and selected copper alloy UNS grades.
Detailed Material Selection
| Material Category | Applicable Material / Grade | Typical Material Standard |
|---|---|---|
| Stainless Steel | F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L | ASTM A182 / A240 |
| Duplex / Super Duplex | F44, F45, F51, F53, F55, F60, F61 | ASTM / ASME A/SA 182 |
| Alloy Steel | F1, F5, F9, F11, F12, F22, F91 | ASTM / ASME A/SA 182 / A387 |
| Carbon Steel | A105, A350, LF2, A516 Gr.70, A36, A694 F42/F46/F52/F60/F65/F706 | ASTM / ASME |
| Nickel Alloys | Nickel 200/201, Monel 400/500, Inconel 600/601/625/800/825, Hastelloy C276, Alloy 20 | ASTM SB / relevant alloy specifications |
| Copper Alloys | Cu-Ni 90/10, Cu-Ni 70/30, C10100, C10200, C10300, C10800, C12000, C12200 | ASTM SB61 / SB62 / SB151 / SB152 |
Class 150 Spectacle Blinds
Dimensional data for Class 150 Spectacle Blinds as provided for the listed nominal pipe sizes.
| NPS | Outside Ø A | Inside Ø B | Centerline C | Thickness t | Web Width W |
|---|---|---|---|---|---|
| 1/2 | 45 | 16 | 60 | 3 | 38 |
| 3/4 | 54 | 21 | 70 | 3 | 38 |
| 1 | 64 | 27 | 80 | 3 | 38 |
| 1¼ | 73 | 42 | 90 | 6.4 | 38 |
| 1½ | 83 | 48 | 100 | 6.4 | 38 |
| 2 | 102 | 61 | 120 | 6.4 | 51 |
| 2½ | 107 | 73 | 140 | 6.4 | 51 |
| 3 | 133 | 89 | 150 | 6.4 | 64 |
| 3½ | 159 | 102 | 175 | 9.7 | 64 |
| 4 | 172 | 114 | 190 | 9.7 | 64 |
| 5 | 194 | 141 | 215 | 9.7 | 76 |
| 6 | 219 | 168 | 240 | 12.7 | 76 |
| 8 | 276 | 219 | 300 | 12.7 | 76 |
| 10 | 337 | 273 | 360 | 15.7 | 102 |
| 12 | 406 | 324 | 430 | 19.1 | 102 |
| 14 | 448 | 356 | 475 | 19.1 | 108 |
| 16 | 511 | 406 | 460 | 22.4 | 108 |
| 18 | 546 | 457 | 580 | 25.4 | 114 |
| 20 | 603 | 508 | 635 | 28.4 | 121 |
| 24 | 714 | 610 | 750 | 31.8 | 140 |
Spectacle Blind Face Types
Flat Face — FF
Flat-face configuration for applications where the mating flange arrangement requires a flat sealing surface.
Raised Face — RF
Raised-face configuration commonly selected for industrial pressure piping and process applications.
Ring Type Joint — RTJ
Ring-type joint configuration for demanding pressure and sealing applications where specified by the piping design.
Applications & Industries
- Oil & Gas
- Petrochemical Plants
- Chemical Processing
- Power Generation
- Refineries
- Marine Industry
- Sugar Industry
- Nuclear Applications
- Defence
- Process Piping
- Industrial Fabrication
- Pressure Piping Systems
Quality & Inspection
Built for Reliable Industrial Piping Performance
Spectacle Blind Flanges can be supplied with inspection and documentation requirements according to project specifications, purchase orders and applicable standards.
- Dimensional inspection
- Material identification and traceability
- Visual and surface inspection
- Material Test Certificate documentation
- Heat number traceability where specified
- Third-party inspection support as required
- Custom drawings and technical documentation
Why Choose Spectacle Blind Flanges?
Positive Line Isolation
Suitable for applications where physical separation of process lines is required.
Wide Material Selection
Material options available for general industrial as well as demanding process environments.
Multiple Standards
Manufactured according to specified ANSI, ASME, DIN, BS, EN and project requirements.
Custom Requirements
Dimensions, materials, face types and documentation can be supplied according to project requirements.
Industrial Applications
Suitable for oil & gas, petrochemical, chemical, power, marine and fabrication sectors.
Technical Documentation
Inspection and material documentation can be provided as specified in the purchase order.
Spectacle Blind Flanges Manufacturer in India
Sawariya Metal Industries manufactures and supplies Spectacle Blind Flanges for industrial piping and process applications. Our product range includes stainless steel, carbon steel, alloy steel, duplex steel, super duplex steel, nickel alloy and copper alloy Spectacle Blind Flanges in different sizes, pressure classes and configurations.
We offer Spectacle Blind Flanges according to ANSI, ASME, DIN, BS and EN requirements with Flat Face (FF), Raised Face (RF) and Ring Type Joint (RTJ) configurations. Products can be supplied for applications in oil & gas, petrochemical, refinery, chemical processing, power generation, marine, sugar, nuclear, defence and industrial fabrication.
Our Spectacle Blind Flanges are available in pressure classes including 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS and 2500 LBS, subject to applicable dimensions, material specifications and project requirements.
Related Flange Products
Blind Flanges
Solid flanges for closing and isolating piping ends.
Slip On Flanges
Flanges designed for pipe slip-on and welding applications.
Weld Neck Flanges
High-integrity flanges for demanding pressure piping systems.
Socket Weld Flanges
Compact flanges for smaller diameter piping applications.
Threaded Flanges
Threaded connection solutions for selected piping systems.
Lap Joint Flanges
Loose flange arrangements for specific piping applications.
Technical Note:
Dimensional, pressure rating, material, face configuration and manufacturing requirements should always be confirmed against the latest applicable standard, approved drawing, purchase order and project specification before manufacturing or installation. The dimensional table above is presented according to the supplied product data.