Blind Flanges
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Blind Flanges
š What is a Blind Flange?
A Blind Flange (BL Flange) is a solid disc used to seal the end of a pipe, valve, or pressure vessel opening. Unlike other flanges, it has no bore (hole). Blind flanges are essential for isolation, inspection, and system maintenance, and they are used across oilfield, marine, and civil engineering industries.
š Blind Flange Types
| Type | Description | Industries |
| Flat Face (FF) | Entire sealing surface contacts the gasket; used with cast components | Civil works, water pipelines |
| Raised Face (RF) | Slightly raised area improves sealing under moderate pressure | Oilfield, chemical processing |
| Ring Type Joint (RTJ) | Grooved face for metal gasket sealing in high-pressure applications | Offshore rigs, refineries |
| Threaded Blind | Internal threads for easy installation/removal (low-pressure use) | Temporary caps, test lines |
| Custom Drilled | Holes or taps added for venting, inspection or pressure relief | Marine engine systems, tank nozzles |
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š Flange Standards ā ANSI, DIN, JIS
| Standard | Pressure Classes | Region & Use |
| ANSI / ASME B16.5 | Class 150, 300, 600, 900, 1500, 2500 | USA ā Oilfield, chemical plants, marine |
| DIN EN 1092-1 | PN 6, PN 10, PN 16, PN 25, PN 40 | EU ā Civil infrastructure, water plants |
| JIS B2220 | 5K, 10K, 16K, 20K, 30K | Japan/Asia ā Marine, ship piping |
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š Pressure Ratings of Blind Flanges
| Standard | Class / Rating | Max Pressure (approx.) |
| ANSI 150 | 285 psi (19.6 bar) | Low-pressure pipelines, civil supply lines |
| ANSI 600 | 1480 psi (102 bar) | Oil & gas processing plants |
| DIN PN16 | 232 psi (16 bar) | Wastewater and storm pipelines |
| JIS 10K | ~145 psi (10 bar) | Marine ship piping, freshwater systems |
| JIS 20K | ~290 psi (20 bar) | Seawater discharge, engine cooling |
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ā Materials for Blind Flanges
| Material | Grades | Best For |
| Carbon Steel | ASTM A105, A350 LF2 | Oilfield, civil water lines |
| Stainless Steel | ASTM A182 F304 / F316 / F316L | Marine applications, chemical plants |
| Duplex Stainless | UNS S31803 / S32750 | Seawater, offshore oil rigs |
| Alloy Steel | ASTM A182 F11 / F22 | High temperature and pressure systems |
| Nickel Alloys | Inconel 625, Monel 400 | Corrosive marine and chemical systems |
| Galvanized Steel | Coated carbon steel | Civil drainage & low-pressure lines |
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š Industry-Specific Applications
š¢ Oilfield Applications
- Isolate sections for maintenance or testing
- Installed in pressure vessels and manifolds
- Compatible with ANSI Class 600 ā 1500 flanges
š¢ Marine Industry
- Seal off unused pipe openings on ships
- Ideal for corrosion-resistant material needs
- Used in ballast systems, fire lines, seawater intake
š Civil Infrastructure
- Common in water treatment plants, stormwater systems
- Easy access for system flushing or inspection
- DIN PN10 / PN16 widely used in non-critical pressure zones
ā Why Choose Blind Flanges?
- š Leak-proof sealing for system isolation
- š§ Easy removal for inspections or pressure testing
- š Available in global standards (ANSI, JIS, DIN)
- ā Wide range of materials to match your media/environment
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our trusted Blind Flange suppliers in Dubai, Burj Al Noor Trading L.L.C provides high-quality flange solutions for industrial, marine, offshore, and civil applications where reliable pipe sealing and system isolation are essential. If you’re asking what is a blind flange or looking to understand the blind flange function, these flanges are solid disks used to close the end of a pipe, valve, or pressure vessel. They play a vital role as a pipe end sealing flange and are commonly used in testing flow systems or in future pipeline expansions. We offer various types of blind flanges, including raised face blind flanges and RTJ blind flanges for high-pressure operations.
Our inventory includes a wide range of blind flange pressure ratings, including PN16 vs Class 150 flanges, tailored for different industrial requirements. We supply high-pressure blind flanges for oil & gas and petrochemical systems, PN16 civil blind flanges for infrastructure projects, and blind flanges for drainage and water pipeline sealing applications. Whether used as a water pipe flange cap or in heavy-duty industrial applications, our flanges are engineered for durability and leak-free performance.
For material options, we stock ASTM A105 blind flanges in carbon steel, F316 stainless steel blind flanges for corrosion resistance, and duplex steel flanges for offshore platforms. Our marine-grade blind flanges and JIS 10K stainless blind flanges are ideal for shipbuilding, desalination plants, and flange for seawater pipe systems. These robust, saltwater-resistant products are ideal for harsh marine environments and long-term pipeline integrity.
Our team ensures you get the right flange for your needs, whether you’re comparing blind vs weld neck flange options or specifying a flange to close a pipe in a critical system. Burj Al Noor Trading L.L.C serves clients across Dubai, Abu Dhabi, Sharjah, the Northern Emirates, Oman, Saudi Arabia, Africa, and the entire GCC with dependable service and fast delivery.
For top-tier Blind Flange suppliers in Dubai, turn to Burj Al Noor Trading L.L.Cāyour source for tested, certified, and corrosion-resistant flange solutions across every application.
We deal in all kinds of flanges, including: Weld Neck Flange, Slip-On Flange, Blind Flange, Threaded Flange, Socket Weld Flange, Lap Joint Flange, Long Weld Neck Flange, Orifice Flange, Spectacle Blind Flange, Ring Type Joint (RTJ) Flange, Forged Flange, Plate Flange, Reducing Flange, and Custom Flanges.
