CuNi 90/10 Cupro Nickel Tube C70600 Seawater Corrosion Resistant Condenser Pipe

CuNi 90/10 Cupro Nickel Tube C70600 Seawater Corrosion Resistant Condenser Pip

Copper Nickel Pipe for Heat Exchanger & Condenser refers to copper-nickel alloy tubes primarily made of CuNi 90/10 (UNS C70600) and CuNi 70/30 (UNS C71500), specifically designed for high-efficiency heat transfer and seawater corrosion resistance. The products are typically manufactured by seamless cold drawing or welding, featuring thin wall, fixed length, high precision, and smooth surface. They can be produced to international standards such as ASTM B111, ASTM B466, ASTM B467, ASME SB111, and ASME SB466. Depending on customer requirements, straight tubes, U-bend tubes, and coiled tubes are available, with quality verification including eddy current testing, hydrostatic testing, and air tightness testing. The products are widely used in power plant condensers, desalination, marine coolers, chemical heat exchangers, and HVAC&R equipment, serving as core heat-transfer elements in seawater cooling and heat exchange systems.

2.Product Applications

Key applications of copper nickel pipe for heat exchanger & condenser include:

1. Power Generation: Condenser tube bundles, auxiliary coolers, lube oil coolers, and generator coolers in fossil-fired and nuclear power plants.

2. Desalination: Heat exchanger tubes, condenser tubes, and preheater tubes in MSF, MED, and RO plants.

3. Shipbuilding & Marine Engineering: Ship central coolers, seawater coolers, air-conditioning condensers, and offshore platform heat exchange equipment.

4. Oil & Gas: Seawater coolers, produced-water coolers, and injection-water heaters on offshore platforms, FPSOs, and LNG modules.

5. Chemical & Process Industry: Distillation column condensers, reactor coolers, seawater-cooled heat exchangers, and pickling coolers.

6. HVAC&R: Condensers, evaporators, and chiller heat exchange tubes for central air conditioning.

7. Others: Corrosion-resistant heat exchange equipment in food processing, papermaking, and metallurgy.

3.Product Advantages

High Heat Transfer Performance: CuNi 90/10 has a thermal conductivity of approximately 40–50 W/(m·K), and CuNi 70/30 about 29–33 W/(m·K). Combined with thin-wall design, heat exchange efficiency is significantly improved.

Excellent Seawater Corrosion Resistance: A dense protective film forms in seawater, with corrosion rates as low as 0.025–0.0025 mm/yr, suitable for long-term seawater cooling conditions.

Inherent Biofouling Resistance: Copper ion release inhibits marine organism attachment on tube walls, reducing biocide dosing and shutdown cleaning frequency.

Thin Wall & High Precision: Wall thickness can be controlled at 0.5–3.0 mm, with high outer diameter precision and smooth surface, beneficial for expansion, welding, and heat transfer.

Resistance to High-Velocity Erosion & Cavitation: CuNi 70/30 can withstand seawater flow rates of 3.0–4.5 m/s, suitable for high-flow, sand-containing, and turbulent conditions.

Good Formability: Supports cold drawing, annealing, bending, flaring, U-bend forming, expansion, and TIG/MIG welding.

Comprehensive Quality Testing: Eddy current testing, hydrostatic testing, air tightness testing, spectral analysis, and mechanical property testing are available to ensure product reliability.

Long Service Life: Can reliably serve in seawater environments for over 20 years, with low life-cycle cost.

​4.Key Product Specifications

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