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Cupronickel Pipe & Fittings

Cupronickel pipes and fittings are widely employed in seawater-handling systems for their superior corrosion resistance and biofouling protection, particularly in shipbuilding, offshore platforms, and desalination plants.

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Product introduction

Cupronickel (also known as Cu-Ni) pipes and  tubes are made from an alloy of nickel and copper. They are known for their excellent corrosion resistance, especially in saltwater environments. This makes them a popular choice for a variety of marine applications, such as seawater piping systems, heat exchangers, and condensers.

ASTM Name Cu Ni Fe Pb
C70600 cuni 90-10 ~89 9.0-11.0 1.0-1.8 <0.05
C71500 cuni 70-30 ~69 29.0-33.0 0.4-1.0 <0.05
Properties

Here are some of the key properties of Cupronickel pipes and tubes:

  • 1 High corrosion resistance: Cupronickel pipes and tubes are highly resistant to corrosion from seawater, brine water, organic compounds, salts, and diluted non-oxidizing acids. This makes them ideal for use in marine environments where they are exposed to saltwater for extended periods.
  • 2 Good thermal conductivity: Cupronickel pipes and tubes have good thermal conductivity, which allows them to transfer heat efficiently. This property makes them suitable for use in heat exchangers and condensers, where they are used to transfer heat between two fluids.
  • 3 Ductility and formability:
  • Cupronickel pipes and tubes are ductile and formable, which means they can be easily bent and shaped into different forms. This makes them versatile and suitable for a wide range of applications.
Product Pictures

 

Application Areas

1. Marine and Shipbuilding

Seawater cooling systems

Fire main systems

Ballast and bilge piping

Hydraulic and pneumatic lines on offshore vessels

 

2. Offshore Oil & Gas Platforms

Seawater intake and discharge systems

Firewater deluge systems

Utility and service water piping

Heat exchanger tubing on topside facilities

 

3. Seawater Desalination

Multi-stage flash (MSF) and reverse osmosis (RO) plant piping

Brine heater tubes and evaporator components

Interconnecting pipelines in desalination trains

 

4.Power Generation

Steam turbine condensers

Cooling water systems in thermal and nuclear power plants

Auxiliary cooling loops and seawater intake structures

 

5. Industrial and Chemical Processing

Heat exchangers and evaporators handling corrosive fluids

Piping systems for chemical plants using saline or brackish water

Petrochemical cooling water circuits

Summary Statement

In summary, cupronickel pipes and fittings are indispensable components in modern marine and industrial infrastructure, delivering unmatched reliability, corrosion resistance, and biofouling protection across a broad spectrum of seawater-handling systems—from naval vessels and offshore platforms to desalination plants and power generation facilities—thereby ensuring operational safety, efficiency, and long-term economic viability.

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