CuNi 70/30 Copper Nickel Socket Weld Flange Class 150 ASME B16.5 Forged Marine Fitting

ASME B16.5 Class 150 CuNi 70/30 Copper Nickel Socket Welding Flange C71500 Forged SWRF

1. Product Description

Copper Nickel Weld Neck Flange is a copper-nickel alloy flange with a tapered neck, manufactured through forging, heat treatment, and precision machining. Its neck is butt-welded to the pipe. Common materials are B10 (90/10 CuNi, UNS C70600) and B30 (70/30 CuNi, UNS C71500). The tapered neck design provides a smooth transition between the flange and the pipe, effectively reducing stress concentration and improving connection strength and sealing reliability. This product is suitable for high-pressure, high-temperature, and highly corrosive media pipelines, especially seawater systems. It can be manufactured according to ASME, DIN, EN, BS, EEMUA, and other standards. Face finishes include Raised Face, Flat Face, Ring Joint, and Male and Female.

2. Product Applications

Copper Nickel Weld Neck Flanges are mainly used in the following fields:

• Shipbuilding and Offshore Engineering: Seawater cooling pipelines, ballast water systems, fire water systems, bilge water systems, and high-pressure offshore platform piping;

• Power and Energy: Condensers, cooling water circulation systems, and seawater transportation pipelines in coastal power plants;

• Seawater Desalination: Piping connections in high-pressure reverse osmosis and multi-stage flash desalination plants;

• Petrochemical: Heat exchangers, condensers, process piping, and corrosive media transportation pipelines;

• Other Industries: Piping systems requiring high connection strength, seawater corrosion resistance, and anti-biofouling performance.

3. Product Advantages

1. High Structural Strength: The tapered neck effectively distributes stress, suitable for high-pressure and high-temperature conditions.

2. Reliable Sealing: Butt welding integrates the flange and pipe into a single structure, reducing potential leak points.

3. Excellent Corrosion Resistance: Outstanding corrosion resistance in seawater, brackish water, and chloride media.

4. Anti-Biofouling: Copper ions inhibit the adhesion of barnacles, algae, molluscs, and other marine organisms.

5. Low Flow Resistance: Smooth inner diameter transition reduces turbulence and pressure drop.

6. Good Weldability: Copper-nickel alloy has excellent weldability, with no complex post-weld heat treatment required.

7. Long Service Life: Service life in seawater environments can reach decades, with low life-cycle cost.

8. Good Material Compatibility: Avoids galvanic corrosion when connected to copper-nickel pipes and copper alloy equipment.

4. Product Functions

1. Connection: Butt-welds pipes to valves, equipment, and fittings.

2. Sealing: Works with gaskets and bolts to achieve long-term reliable pressure sealing.

3. Flow Guidance: The tapered neck guides media smoothly and reduces fluid resistance.

4. Pressure Containment: Withstands high pressure, temperature fluctuations, and thermal expansion and contraction.

5. Structural Support: Enhances piping system rigidity and overall stability.

6. Corrosion Prevention: Matches copper-nickel pipes to avoid dissimilar metal contact corrosion.

5. Key Technical Parameters​

FAQ

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