Blank Flange

Blank Flange

The Ultimate Isolation Solution for Piping Systems

Also known as a Blind Flange, our Blank Flanges are essential components designed to securely seal the ends of piping systems, valves, or pressure vessels. Unlike standard flanges, these solid discs have no bore center, making them the industry standard for isolating flow, terminating pipelines, and ensuring safety during maintenance operations.

Key Features & Benefits

• Positive Isolation: Provides a reliable, leak-proof seal to completely stop fluid or gas flow, ensuring the safety of personnel and equipment during maintenance or system shutdowns.

• High Pressure Containment: Because they lack a center bore, blank flanges are structurally robust and capable of withstanding extreme internal pressures and mechanical stresses from pipe weight.

• Reusability & Accessibility: Unlike welded caps, blank flanges are bolted, allowing for easy removal to inspect lines, clear blockages, or reconfigure the piping network.

• Versatile Sealing Options: Available with various face types (RF, FF, RTJ) to match mating flanges perfectly, ensuring a tight seal with the appropriate gasket.

• System Testing: Essential for hydrostatic pressure testing, allowing contractors to blank off open ends to verify the integrity of the entire pipeline.

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 blank flanges in materials that match your pipeline specifications to prevent galvanic corrosion and ensure compatibility:

• 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

Blank flanges are critical in almost every industrial sector:

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

• Maintenance & Repair: Isolating specific sections of a plant (e.g., pumps, valves) to allow safe repair work without draining the entire system.

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

• Flow Regulation: Used in conjunction with spectacle blinds (spades and spacers) to visually indicate open or closed flow status.

• Manholes & Access Points: Sealing openings on pressure vessels and tanks.

Quality Assurance & Packaging

Safety is paramount for isolation components. Our blank flanges undergo strict 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.