Weld Neck Flange

Weld Neck Flange

High-Integrity Connections for Critical and High-Pressure Piping Systems

Our Weld Neck Flanges are engineered for maximum structural integrity, making them the premier choice for critical piping applications. Featuring a distinctive long, tapered hub, these flanges provide superior stress distribution and seamless flow characteristics. They are specifically designed to handle high pressures, extreme temperatures, and frequent load fluctuations, ensuring safety and reliability in the most demanding environments.

Key Features & Benefits

• Superior Structural Integrity: The tapered hub acts as a reinforcement, providing exceptional strength and rigidity. This design significantly reduces stress concentration at the base of the法兰, preventing fatigue and failure.

• Radiographic Examination: The butt-weld connection allows for full-penetration welds that can be easily inspected via radiography (X-ray) to ensure complete fusion and zero defects, which is crucial for hazardous fluids.

• Optimized Flow Dynamics: The bore of the flange neck matches the inside diameter of the pipe, eliminating turbulence and preventing erosion at the connection point.

• Reduced Thermal Stress: The flexible neck design accommodates thermal expansion and contraction, making it ideal for systems with extreme temperature cycling.

• Leak-Proof Performance: The robust construction ensures a tight, permanent seal, minimizing the risk of leakage in high-pressure steam, gas, and chemical lines.

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, GOST.

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

Available Materials

We manufacture Weld Neck Flanges in a vast array of materials to suit specific service conditions:

• 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

Weld Neck Flanges are the standard for high-performance sectors:

• Oil & Gas Refineries and Transmission Pipelines

• Petrochemical and Chemical Processing Plants

• Power Generation (Thermal, Nuclear, and Hydro)

• High-Pressure Steam Systems

• Cryogenic and LNG Facilities

• Offshore Drilling Platforms

Quality Assurance & Packaging

Every Weld Neck Flange is manufactured under strict quality control protocols. We perform comprehensive testing, including Ultrasonic Testing (UT), Magnetic Particle Inspection (MPI), Radiographic Testing (RT), and Impact Testing. Full traceability is maintained with Material Test Reports (MTR) provided for every batch.

To ensure safe international transport, flanges are protected with anti-corrosion coatings and packed in sturdy, fumigated wooden cases or export-grade pallets, safeguarding the machined faces and bevels from damage.