CuNi 70/30 Copper Nickel 90° LR Elbow, High Strength ASME B16.9 Butt Weld Fitting
CuNi 70/30 Copper Nickel 90° LR Elbow, High Strength ASME B16.9 Butt Weld Fitting
1.Product Description
The Copper Nickel Elbow is a prefabricated, factory‑tested pipe fitting ready for field installation. It is manufactured from corrosion‑resistant CuNi alloys (C70600/C71500) and delivered in the solution‑annealed condition, with ends prepared to specification for rapid fit‑up. Each elbow is supplied with end protectors and clear marking for easy identification on the job site. The product is compatible with standard pipe sizes and schedules, enabling direct integration into new or existing seawater piping systems.
2.Product Applications
This elbow is used in the following typical field installation scenarios:
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Shipboard piping erection in newbuild shipyards and dry‑dock repair yards
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Offshore platform topside piping hook‑up and tie‑in works
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Seawater intake and outfall pipeline construction for coastal power plants
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Retrofit and expansion projects in existing desalination and chemical plants
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Submarine pipeline riser connections and topside jumper installations
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General replacement of corroded carbon steel or galvanized elbows in marine environments
3 · Product Advantages
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Lightweight compared to steel – Approximately 85% weight of equivalent carbon steel elbow; easier manual handling and rigging.
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Low magnetic permeability – Allows welding near sensitive equipment without magnetic field interference.
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Oxide‑free surface – Factory pickling removes scale, minimizing contamination risk during welding.
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Forgiving fit‑up – Dimensional tolerances allow ±1.5 mm misalignment correction during alignment.
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Reduced post‑weld treatment – No post‑weld heat treatment (PWHT) required for thicknesses up to 30 mm.
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Reusable – Can be cut, re‑beveled, and re‑welded in the field for modification purposes.
4.Key Product Specifications
| Parameter | Installation Reference Value |
| Standard Nominal Sizes | DN15 – DN600 (NPS ½″ – 24″) |
| CentertoFace Dimension (LR 90°) | 1.5 × Nominal Diameter (e.g., DN200 = 300 mm) |
| CentertoFace Dimension (SR 90°) | 1.0 × Nominal Diameter |
| Recommended Support Spacing (horizontal) | 3 – 5 meters depending on pipe size and fluid weight |
| Minimum Bend Radius for Cold Field Bending | Not applicable – factory fixed angle; no cold field bending permitted |
| Welding Process Recommended | GTAW (TIG) root pass + SMAW (stick) or GMAW (MIG) fill/cap |
| Preheat Temperature | Not required (ambient temperature ≥ 5°C) |
| Interpass Temperature | ≤ 150°C (to avoid grain growth) |
| Filler Metal Compatibility | ERCuNi (AWS A5.7) for GTAW; ECuNi (AWS A5.6) for SMAW |
| Shielding Gas (GTAW) | 100% Argon (or ArHe mix for thicker sections) |
| Back Purging Requirement | Recommended for root pass; 100% Argon, flow rate 510 L/min |
| PostWeld Heat Treatment (PWHT) | Not required for wall thickness ≤ 30 mm |
| Maximum Allowable Misalignment (fitup) | ≤ 1.5 mm for thickness ≤ 20 mm; ≤ 3 mm for thickness > 20 mm |
| Bolting Torque (flanged connections, Class 150) | 100140 N·m (for M20 studs, lubricated) |
| Gasket Recommended | EPDM or PTFEencapsulated for seawater service |
| Flange Face Finish | Serrated concentric or spiral; 125250 μin Ra |
| Handling Weight (typical, DN300 LR) | Approx. 4555 kg (schedule 40, C70600) |
| Storage Condition | Dry, indoor or covered; keep end caps on; avoid direct seawater splashing prior to installation |
| Installation Clearance Requirement | Allow minimum 300 mm clearance around elbow for welding access and inspection |
FAQ
1. Are you trading company or manufacturer ? We are manufacturer ,You can see the certification.
2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ? Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ? Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.
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