Blind Flanges
Stellanox Steel manufactures and supplies robust, high-integrity Blind Flanges used to close the end of piping systems or nozzles. Crafted from high-performance materials including Stainless Steel, Carbon Steel, Alloy Steel, Monel, Inconel, Hastelloy, Nickel, Copper Alloys, and Titanium, our blind flanges are engineered to handle high-pressure, high-temperature, and corrosive media in industries such as oil & gas, petrochemical, power generation, chemical processing, and marine.
Available in raised face (RF), ring type joint (RTJ), and flat face (FF) configurations, our blind flanges conform to ASME B16.5, B16.47, EN 1092-1, DIN, ISO, and other international standards.
What are Blind Flanges?
Blind Flanges are solid discs used to block off or seal the end of a piping system, vessel opening, or nozzle. They are often bolted onto another flange and can be removed for easy access to the system for inspection, maintenance, pressure testing, or future expansion. Blind flanges are critical where leak-tight isolation and system reliability are paramount.
They are commonly used in dead-end service and hydrostatic testing of pipelines or pressure vessels.
| Products |
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Stainless Steel |
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Carbon Steel |
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Duplex Stainless Steel |
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Super Duplex Stainless Steel |
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Alloy Steel |
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Titanium |
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Hastelloy |
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Inconel |
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Monel |
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Aluminium |
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Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features
Complete Seal for Piping Ends or Equipment Nozzles
Withstands High Pressure, Temperature & Corrosive Media
Easy to Bolt, Remove, and Reinstall
Available in RF, FF, and RTJ Face Types
Offered in ANSI, DIN, EN, BS, and ISO Standards
Custom Sizes, Drilling, and Machining Available
Specification
| Property | Details |
|---|---|
| Sizes Available | ½” NB to 60” NB (DN15 – DN1500) |
| Pressure Ratings | Class 150, 300, 600, 900, 1500, 2500 |
| Face Types | RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint) |
| Drilling Options | Standard, Blank, Custom Bore, Tapped Hole |
| Materials | SS (304/316), CS (A105), Alloy Steel (F11/F22), Inconel, Monel, Hastelloy |
| Standards | ASME B16.5, B16.47, DIN 2527, EN 1092-1, ISO 7005-1 |
| Certifications | EN 10204 3.1/3.2, NACE MR0175, PED, CE, ISO, IBR |
Materials and Equivalent Grades
| Material | Grades |
|---|---|
| Stainless Steel | 304, 304L, 316, 316L, 321 |
| Carbon Steel | A105, A350 LF2 |
| Alloy Steel | A182 F11, F22 |
| Nickel Alloys | Inconel 600/625, Monel 400 |
| Copper Alloys | Cu-Ni 70/30, Bronze |
| Titanium | Gr. 2, Gr. 5 |
Weight
| Size (inches) | Approx. Weight (kg) | Pressure Class | Standard |
|---|---|---|---|
| 2" | 4.50 | 150# | ANSI B16.5 |
| 4" | 9.20 | 150# | ANSI B16.5 |
| 6" | 17.10 | 150# | ANSI B16.5 |
| 8" | 28.30 | 150# | ANSI B16.5 |
| 10" | 43.80 | 150# | ANSI B16.5 |
Applications
Pipeline End Termination: Safely caps off live or dead-end systems
Pressure Testing Lines: Seals ends during hydrostatic and leak tests
Process Vessels & Tanks: Nozzle blanks and removable sealing points
Offshore Platforms: Pipeline headers, oil risers
Boiler Systems: Steam and condensate isolation
Desalination Plants: Isolation in high-salinity media pipelines
Benefits
Absolute System Sealing and Isolation
Easy Maintenance and Access for Piping Ends
Strong Design with Even Stress Distribution
Available in Heavy-Duty Ratings (up to Class 2500)
Compatible with All Standard Flange Face Types
Globally Certified for Oil & Gas, Marine, and Power Plants
2025 Stellanox Steel |