Blind Flange

Blind Flange

Secure Termination and Isolation for High-Performance Piping

Our Blind Flanges, also known as Blank Flanges, are the definitive solution for sealing the ends of piping systems, pressure vessels, or valve openings. Designed as a solid disc with no bore center, these flanges are engineered to withstand immense internal pressure and mechanical stress. They are the industry standard for safely terminating flow, isolating system sections for maintenance, and conducting hydrostatic pressure tests.

Key Features & Benefits

• Robust Pressure Containment: Due to their solid construction and lack of a center opening, blind flanges offer superior strength, making them ideal for high-pressure applications and heavy-duty industrial environments.

• Positive Isolation: Provides a leak-proof seal to completely stop the flow of fluids or gases. This is critical for safely isolating sections of a pipeline during repairs, ensuring the protection of personnel and equipment.

• Easy Access & Reusability: Unlike welded caps (pipe caps), blind flanges are bolted to the mating flange. This allows for easy removal to inspect the line, clear blockages, or reconfigure the piping system for future expansion.

• System Testing Essential: Widely used in hydro-testing and pneumatic testing to blank off open pipe ends, verifying the integrity of the entire pipeline network under pressure.

• Versatile Configurations: Available in all standard pressure classes and face types (RF, FF, RTJ) to ensure a perfect match with your existing piping components.

Technical Specifications

• Size Range: 1/2" to 60" (DN15 to DN1500)

• Pressure Classes: Class 150, 300, 600, 900, 1500, 2500 / PN6 to PN100

• Standards Compliance: ASME B16.5, ASME B16.47 Series A & B, EN 1092-1, JIS B2220, BS 4504, DIN, API 6A.

• Facing Types: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Male & Female (M&F), Tongue & Groove (T&G).

Available Materials

We manufacture blind flanges in a comprehensive range of materials to match your pipeline specifications and prevent galvanic corrosion:

• Carbon Steel: ASTM A105, A350 LF2, A694 F52/F60/F65/F70

• Stainless Steel: ASTM A182 F304/L, F316/L, F310, F321, F347, 904L

• Duplex & Super Duplex: F51 (2205), F53 (2507), F55

• Alloy Steel: ASTM A182 F11, F12, F22, F91

• Nickel Alloys: Inconel 600/625, Monel 400/K500, Hastelloy C276/C22

Applications

Blind flanges are indispensable across a wide spectrum of industries:

• Pipeline Termination: Sealing the ends of unused pipelines or future connection points.

• Maintenance & Safety: Isolating pumps, valves, and instruments to allow for safe maintenance without draining the entire system.

• Pressure Testing: Closing off pipe ends to perform hydro-tests or pneumatic tests.

• Flow Control: Used in "Spectacle Blind" assemblies to visually indicate open or closed flow status.

• Manholes & Vessels: Sealing access openings on pressure vessels and storage tanks.

Quality Assurance & Packaging

Safety is paramount for isolation components. Our blind flanges undergo rigorous quality control to ensure they can withstand rated pressures without deformation or leakage.

• Testing: We perform Ultrasonic Testing (UT) to detect internal defects and ensure material homogeneity. Hydrostatic testing and Magnetic Particle Inspection (MPI) are available upon request.

• Certification: Full Material Test Reports (MTR) are provided, verifying chemical composition and mechanical properties.

• Packaging: To protect the critical sealing surfaces, all flanges are packed with plastic caps or wooden covers and secured in fumigated wooden crates or pallets for export.