Product Overview
A Copper Nickel 90° Long Radius Elbow is a key pipe fitting used to change the direction of piping systems by 90 degrees. Its bending radius is usually 1.5 times the nominal pipe size/NPS, which is why it is called a Long Radius Elbow.
Copper nickel 90° long radius elbows are manufactured from copper nickel alloy/Cu-Ni alloy, offering excellent seawater corrosion resistance, good mechanical strength, and outstanding resistance to erosion corrosion. They are widely used in shipbuilding, offshore engineering, seawater desalination, power plants, petrochemical industries, and marine energy development.
Compared with short radius elbows, long radius elbows can effectively reduce flow resistance and pressure loss, improving fluid transmission efficiency. Therefore, they are often the preferred elbow type in marine and industrial piping systems.
Common materials for copper nickel 90° long radius elbows include CuNi 90/10 and CuNi 70/30. Among them, CuNi 90/10 elbows offer excellent overall performance, strong seawater corrosion resistance, and relatively economical cost, making them one of the most widely used copper nickel alloy fittings in seawater piping systems.
MC manufactures copper nickel elbow products in accordance with standards such as ASME B16.9, ASTM B151/B171, GB/T 5231, and other applicable specifications. For marine applications, products can be supplied with classification society certificates such as ABS, DNV, CCS, LR, etc.
Product Specifications
| Item | Specification |
| Main Material | 90/10 Copper Nickel |
| Bending Angle | 90° |
| Pipe Size/DN | DN15–DN600, 1/2"–24" |
| Wall Thickness | SCH5S–SCH160 |
| Working Pressure | ≤ 2.5 MPa, depending on specifications |
| Working Temperature Range | -20°C to 300°C |
| Type | Seamless, welded |
| Connection Types | Butt welding, socket welding, flange connection, etc. |
| End Forms | Plain end, beveled end, socket end, or machined according to drawings |
| Standards | GB, CB, DIN, JIS, EN, ASME, ANSI, etc. |
| Applicable Media | Seawater, brine, cooling water, fresh water, and certain chemical media |
Performance Features of 90° LR Elbows
1.Excellent Seawater Corrosion Resistance
Copper nickel alloy can form a stable protective film in seawater environments, effectively resisting pitting corrosion, crevice corrosion, galvanic corrosion, and marine atmospheric corrosion. Even after long-term exposure to marine environments, it maintains reliable service performance.
2.Strong Resistance to Erosion Corrosion
In seawater cooling systems, fire protection systems, or circulating water pipelines, the medium usually flows at a certain velocity. Compared with ordinary materials, copper nickel alloy offers better erosion corrosion resistance and can remain stable under relatively high flow-rate conditions.
3.Good Weldability
The product can be used together with copper nickel pipes, copper nickel flanges, copper nickel tees, reducers, and other fittings. After proper welding, it forms a strong piping connection structure, ensuring system sealing performance and operational safety.
4.Low Flow Resistance
The long radius structure can significantly reduce fluid flow resistance, lower pressure loss, and minimize turbulence and impact. This helps improve the transmission efficiency of the entire piping system.
5.Long Service Life
In marine environments, copper nickel pipe fittings typically have a service life of more than 20 years.
Application Fields
Shipbuilding:Used in seawater cooling piping systems, ballast water pipelines, fire-fighting systems, and bilge water piping systems.
Offshore Engineering:Used in offshore platform piping systems and subsea pipelines.
Seawater Desalination:Used for supporting pipeline networks in desalination plants.
Power Industry:Used in condenser cooling water pipelines of nuclear power plants and thermal power plants.
Petrochemical Industry:Used in process pipelines carrying corrosive media.
Difference Between Copper Nickel 90° Long Radius Elbow and Short Radius Elbow
| Item | Long Radius Elbow | Short Radius Elbow |
| Bending Radius | 1.5D | 1.0D |
| Flow Resistance | Low | Relatively high |
| Pressure Loss | Low | High |
| Flow Performance | Excellent | General |
| Installation Space | Larger | Smaller |
| Service Life | Longer | Shorter |
| Recommended Applications | Seawater systems, high-flow systems | Space-limited systems |
FAQ
1. Is the copper nickel 90° long radius elbow suitable for seawater systems?
Yes. Copper nickel 90/10 and 70/30 alloys are designed for marine environments and offer excellent seawater corrosion resistance and anti-biofouling performance. They are ideal choices for seawater cooling and desalination systems.
2. What is the difference between CuNi 90/10 and CuNi 70/30 elbows?
CuNi 90/10 provides good corrosion resistance and cost efficiency. CuNi 70/30 offers higher strength and stronger erosion corrosion resistance, making it more suitable for high-velocity seawater environments.
3. What sizes can you supply?
We can usually supply sizes from DN15 to DN1200, 1/2"–48", and special sizes and wall thicknesses can be customized according to customer requirements.
4. Which international standards do your products comply with?
Products can be manufactured according to ASME B16.9, ASTM B366, EN, DIN, JIS, and other international standards.
5. Do you provide third-party inspection certificates?
Yes. We can provide EN 10204 3.1 certificates and support inspection by classification societies such as BV, ABS, DNV, LR, CCS, etc.
6. Can you customize special wall thicknesses and non-standard elbows?
Yes. We support customized production according to drawings, project standards, or special operating conditions.