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Selecting the Right Copper Nickel 90/10 Pipe Fittings for Seawater Applications

When it comes to seawater applications, selecting the right materials is crucial for the longevity and efficiency of the system. Copper Nickel 90/10 pipe fittings are a popular choice for seawater applications due to their resistance to corrosion and ability to withstand harsh environments. In this blog post, we will cover the key factors to consider when selecting the right Copper Nickel 90/10 pipe fittings for your seawater application.

What is Copper Nickel 90/10 Pipe Fittings?

Copper Nickel 90/10 Pipe Fittings are a combination of nickel and copper alloy materials specifically designed for seawater systems. This alloy comprises 90% copper and 10% nickel, providing a strong material for joining pipes in marine applications. The joints made with these fittings will be highly corrosion-resistant even after years of continuous exposure to saltwater. Additionally, Copper Nickel 90/10 Pipe Fittings offer good thermal conduction properties, which make them an ideal choice for heating and cooling system installations. They also provide excellent tensile strength and high wear resistance against aggressive media like seawater or brackish water containing chlorination or other chemicals used in certain processes. With all these features, Copper Nickel 90/10 Pipe Fittings represent the optimal solution for long-lasting, trouble-free connection systems on ships, offshore platforms and in desalination plants.

Corrosion Resistance

Copper nickel 90/10 pipe fittings are known for their excellent resistance to corrosion in seawater and other marine environments. Due to its high resistance against chloride ion stress-corrosion cracking, it is preferred over other types of steel, such as stainless steel. When exposed to the environment, the copper-nickel alloy will form an oxide layer that protects the underlying metal from further corrosion. This makes copper nickel 90/10 pipe fitting resilient even in extreme weather conditions and exposure situations such as frequent wetting and drying cycles or salt-laden air. Furthermore, the superior properties of copper-nickel also make it highly resistant to biofouling, making it a suitable choice for components related to marine biology operations.

Temperature and Pressure Ratings

Copper Nickel 90/10 pipe fittings should be able to handle the temperature and pressure of your system. The maximum operating temperature for Copper Nickel 90/10 is approximately 300 degrees Celsius, while the maximum operating pressure is 6000 PSI. Choose fittings rated for your system’s temperatures and pressures to ensure optimal performance and safety. Copper Nickel 90/10 Pipe Fittings have a wide range of temperature and pressure ratings, depending on the material’s alloy properties. This alloy is designed primarily for corrosion resistance in seawater and other marine environments, making it an ideal choice for pipes used in shipbuilding, coastal water, offshore oil rigs, desalination plants and more. It is also resistant to most sulphuric acids and fairly resistant to hydrochloric acid, with good ductility characteristics even at cryogenic temperatures.

Ease of Installation and Maintenance

Copper Nickel 90/10 pipe fittings should be easy to install and maintain. Look for fittings that are easy to weld, solder, or join with a brazing technique. These fittings should also allow for easy access during maintenance and repairs. Additionally, fittings resistant to fouling or scaling can minimize maintenance requirements and increase efficiency.

Compatibility with Other Materials

When selecting Copper Nickel 90/10 pipe fittings, it’s important to consider their compatibility with other materials in your system. Copper Nickel 90/10 is incompatible with certain materials such as zinc, aluminium, and lead. Avoid using these materials in the same system to prevent galvanic corrosion. Additionally, ensure the fittings are compatible with your system’s gaskets, seals, or other components.

Certification and Compliance

When selecting Copper Nickel 90/10 pipe fittings for seawater applications, it’s important to ensure they meet the required certifications and compliance standards. The fittings should be tested and certified for marine applications and comply with relevant industry standards such as ASTM and ASME. Choosing certified and compliant fittings ensures that they meet the required quality and safety standards.


Selecting the right Copper Nickel 90/10 pipe fittings for seawater applications is essential for maintaining efficiency and safety in your system. When selecting, consider factors such as corrosion resistance, temperature and pressure ratings, ease of installation and maintenance, compatibility with other materials, and certification and compliance. By choosing the right fittings, you can ensure your seawater application’s long-lasting and trouble-free operation.