2-24 Inch CuNi 70/30 Concentric Reducer ASME B16.9 Class 150 Pipe Fitting

2-24 Inch CuNi 70/30 Concentric Reducer ASME B16.9 Class 150 Pipe Fittings

1.Product Description

The Copper Nickel Reducer Fitting is a standard pipe component designed for diameter transition in piping systems. It is fabricated from copper-nickel binary alloys, with commonly available grades being 90/10 type (UNS C70600, equivalent to BFe10-1-1) and 70/30 type (UNS C71500, equivalent to B30). The product is shaped through hot forging or cold extrusion, followed by solution heat treatment to achieve uniform grain structure and stable corrosion resistance. Based on axial geometry, the fitting is classified into Concentric Reducers (axes aligned on the same centerline) and Eccentric Reducers (axes parallel but not coincident). Concentric types are preferred for vertical risers or alignment-critical applications, whereas eccentric types are intended for horizontal pipelines to maintain a consistent bottom elevation for gravity draining. The fittings are manufactured and inspected in accordance with ASME B16.9, DIN 86089, and GB/T 12459, with end connections available in butt-weld, socket-weld, threaded, or flanged configurations to suit various installation requirements.

2.Product Applications

Owing to the long-term stability of copper-nickel alloys in saline and corrosive media, this product is extensively adopted across the following civil and industrial sectors:

• Commercial shipping and offshore resource development – used in seawater fire-fighting networks, ballast water treatment systems, low-temperature cooling circuits, and engine cooling water lines aboard large bulk carriers, oil tankers, LNG carriers, and fixed/floating offshore production facilities.

• Seawater resource utilization projects – applied in intake piping downstream of screens, brine recirculation lines in heat-recovery sections of multi-stage flash desalination plants, and interstage connections in membrane reverse-osmosis systems.

• Power generation and energy conversion facilities – adapted for circulating water pump suction/discharge connections, auxiliary cooling water distribution headers, and steam/water sampling cooler piping at coastal coal-fired plants, combined-cycle gas-turbine stations, and commercial nuclear power plants.

• Petrochemical and coal chemical industries – serving as diameter-transition components in air-cooled and water-cooled heat-exchanger piping for atmospheric/vacuum distillation, catalytic reforming, and hydrocracking units, as well as in sour-water stripping sections.

• Municipal water supply/drainage and district heating/cooling – utilized as standard reducing elements between long-distance transmission mains and distribution branches, between biological treatment tank interconnections in wastewater plants, and at branch junctions in district cooling/heating networks.

• General industrial infrastructure – including large cold-storage refrigeration systems, compressed air station piping, process cooling water recirculation systems, and fire-pump discharge headers.

3.Product Advantages

• Strong localized corrosion resistance – the nickel content enhances the stability of the passive film, providing excellent resistance to pitting and crevice corrosion in chloride-bearing solutions, particularly suitable for stagnant or low-velocity saline conditions.

• Excellent erosion and abrasion resistance – the well-balanced hardness and ductility allow the material to withstand prolonged seawater scouring containing fine sand or rust particles, with wall-thinning rates far below those of ordinary carbon steel and cast iron.

• Self-cleaning anti-fouling function – sustained release of trace copper ions on wetted surfaces effectively decelerates the attachment of barnacles, tube worms, and algae to the inner wall, reducing the risk of increased flow resistance.

• Adequate post-weld property recovery – with proper welding procedures, the heat-affected zone of solution-treated material maintains a corrosion resistance level close to that of the parent metal, ensuring joint strength equivalent to the base material.

• Good fatigue and thermal-cycle tolerance – the alloy exhibits a moderate coefficient of thermal expansion and sound low-cycle fatigue resistance, adapting well to frequent start-up/shutdown operations and wide temperature fluctuations.

• Significant long-term overall economy – although initial procurement costs are relatively higher, reduced replacement frequency and minimized downtime losses result in superior return on investment over extended operating periods compared with conventional metal fittings.

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​4.Key Product Specifications

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