Spectacle Blind Flanges
Spectacle Blind Flanges are specialized pipeline safety components designed to isolate or control fluid flow in piping systems. Manufactured from high-quality materials, they provide excellent durability, pressure resistance, corrosion protection, and reliable sealing performance for oil & gas, petrochemical, refineries, power plants, chemical processing, and industrial applications.
Overview
Spectacle Blind Flanges are important pipeline components used to temporarily block or allow flow within piping systems. They consist of two connected discs — one solid blind plate and one open ring spacer — allowing easy switching between open and closed pipeline positions.
These flanges are widely used for pipeline maintenance, inspection, and safety operations where positive isolation is required. Their robust design ensures dependable sealing, operational safety, and reliable performance in high-pressure and high-temperature environments.
Veltronova Industries supplies premium quality Spectacle Blind Flanges manufactured with advanced technology and superior-grade materials. Available in different sizes, pressure classes, materials, and international specifications, our Spectacle Blind Flanges serve oil & gas, refineries, petrochemical plants, chemical industries, power plants, offshore, and marine applications.
Technical Specifications
| Material | Grades Available | Standards | Size Range | Pressure Class | Types | Face Finish |
|---|---|---|---|---|---|---|
| Carbon Steel Spectacle Blind Flanges | ASTM A105, A350 LF2, A516 Gr.70 | ASME B16.48, ANSI, ASTM | ½” – 60” | Class 150 – Class 2500 | Spectacle Blind, Spacer, Paddle Blind | RF, RTJ, FF |
| Stainless Steel Spectacle Blind Flanges | SS 304/304L, 316/316L, 321, 347, 904L | ASTM A240, ASME B16.48 | ½” – 60” | Class 150 – Class 2500 | Spectacle Blind, Line Blind | Raised Face, Polished |
| Alloy Steel Spectacle Blind Flanges | ASTM A387, F11, F22, F91 | ASTM, ASME B16.48 | ½” – 48” | Class 150 – Class 2500 | High Pressure Spectacle Blind | RF, RTJ Finish |
| Duplex / Super Duplex Spectacle Blind Flanges | UNS S31803, S32205, S32750, S32760 | ASTM A240 | ½” – 48” | Class 150 – Class 2500 | Spacer Blind, Spectacle Blind | Pickled & Passivated |
| Inconel Spectacle Blind Flanges | Inconel 600, 601, 625, 718 | ASTM B168 | ½” – 24” | Class 150 – Class 2500 | Spectacle Blind Flanges | Polished Finish |
| Hastelloy Spectacle Blind Flanges | Hastelloy C22, C276 | ASTM B575 | ½” – 24” | Class 150 – Class 2500 | Line Blind Flanges | Polished, Pickled |
| Monel Spectacle Blind Flanges | Monel 400, K500 | ASTM B127 | ½” – 24” | Class 150 – Class 1500 | Spectacle Blind | Machined Finish |
| Titanium Spectacle Blind Flanges | Titanium Gr.1, Gr.2, Gr.5 | ASTM B265 | ½” – 24” | Class 150 – Class 1500 | Pipeline Isolation Blind | Pickled, Polished |
Features & Advantages of Spectacle Blind Flanges
Improves stress distribution for enhanced structural integrity.
Improves stress distribution for enhanced structural integrity.
Improves stress distribution for enhanced structural integrity.
Improves stress distribution for enhanced structural integrity.
Improves stress distribution for enhanced structural integrity.
Improves stress distribution for enhanced structural integrity.
Applications Across Industries
Oil & Gas
Used in upstream, midstream and downstream pipeline systems.
Petrochemical
Used in upstream, midstream and downstream pipeline systems.
Power Generation
Used in upstream, midstream and downstream pipeline systems.
Chemical Processing
Used in upstream, midstream and downstream pipeline systems.
Marine & Offshore
Used in upstream, midstream and downstream pipeline systems.
Water Treatment
Used in upstream, midstream and downstream pipeline systems.
Frequently Asked Questions
Technical questions on our Spectacle Blind Flanges, answered by our engineering team.
Spectacle Blind Flanges are used to isolate pipeline sections, stop flow, and provide safe maintenance or inspection access in industrial piping systems.
It is called a Spectacle Blind because its shape looks like a pair of spectacles, consisting of one solid blind plate and one open ring spacer connected together.
Spectacle Blind Flanges are available in Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel, Super Duplex Steel, Inconel, Hastelloy, Monel, Nickel Alloy, and Titanium materials.
They are manufactured according to ASME B16.48, ASTM, ANSI, and other international industrial standards.
Spectacle Blind Flanges provide secure pipeline isolation, easy operation, high-pressure resistance, excellent sealing capability, safety, and long service life in critical applications.
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