CuNi 70/30 Elbow ASME B16.9 BW LR 90° High Pressure Pipe Fitting Custom

1. Product Description

Our CuNi 70/30 Elbows are precision-engineered high-performance pipe fittings designed to change flow direction in demanding marine, offshore, and industrial seawater piping systems. Manufactured from premium UNS C71500 (70/30) copper-nickel alloy, these elbows deliver superior corrosion resistance, exceptional erosion resistance at high flow velocities, and outstanding long-term reliability in aggressive marine environments.

Available in 45°, 90° Long Radius, 90° Short Radius, and 180° configurations, our elbows comply with ASME B16.9, ASTM B466, EEMUA 144, and DIN 86019 standards. We support Butt Weld, Socket Weld, and Threaded connections, with sizes ranging from 1/2" to 24" NB and schedules Sch 5S to XXS. Full customization including special radii (1D to 10D), special angles, tight tolerances, and custom markings is available with 100% material traceability.

Compared to 90/10, 70/30 CuNi offers higher nickel content (29-33%), providing enhanced resistance to erosion and impingement attack at higher velocity seawater flow, making it the preferred choice for critical naval, offshore, and high-performance marine applications.

2. Key Technical Parameters

3. Product Advantages

Superior Erosion and Impingement Resistance

The higher nickel content (29-33%) in C71500 provides exceptional resistance to erosion-corrosion and impingement attack. While 90/10 handles flow velocities up to 3.0-3.5 m/s, 70/30 reliably handles higher velocities, making it the preferred choice for naval vessels, high-speed seawater intake systems, and offshore platforms.

Outstanding Seawater Corrosion Resistance

C71500 forms a stable protective oxide film providing outstanding resistance to general corrosion, pitting, and crevice attack. The alloy is immune to stress corrosion cracking, ensuring reliable performance even under high-stress conditions with long-term corrosion rates below 2.5 micrometers per year.

Superior Biofouling Resistance

The bacteriostatic properties continuously release cuprous ions that effectively retard marine organism settlement. This natural self-cleaning characteristic eliminates costly mechanical cleaning procedures, reduces flow restriction, and significantly decreases chlorine treatment requirements.

4. Primary Applications

5. Installation and Important Cautions

Installation Guidelines

Pre-cleaning is required to remove all surface contaminants before installation. TIG or MIG welding is recommended with no post-weld heat treatment required. Use matching 70/30 CuNi filler metal. Avoid direct contact with carbon steel in wet environments to prevent galvanic corrosion. Use insulating gaskets or coatings where dissimilar metal connections are unavoidable.

Important Cautions

Store in clean, dry, well-ventilated areas and avoid direct contact with carbon steel using wooden separators. Avoid mechanical damage to surfaces and bevel ends during transport. Ensure proper gasket selection and follow torque specifications. Provide adequate pipe supports to minimize stress on elbows.

6. Packaging, Payment and Delivery

Packaging

VCI paper wrapping prevents corrosion during ocean transit. Plastic end caps protect bevel ends and surfaces. Seaworthy wooden crates ensure damage-free export shipment. Humidity indicators monitor internal conditions.