Marine & Offshore

Nickel Aluminum Bronze (NAB) Valves for Desalination Plants: Complete Technical Guide

Published on March 13, 2026 | By Supreme Valves India

Desalination plants face extremely challenging operating conditions with highly corrosive environments. Nickel Aluminum Bronze (NAB/NiAlBr) valves have become the preferred choice for these critical applications due to their excellent corrosion resistance and mechanical properties.

Why NAB Valves for Desalination?

Desalination processes involve handling of:

• Concentrated brine with high salinity (50,000-70,000 ppm)
• Seawater at various temperatures
• Aggressive anti-scaling chemicals
• Chlorine and chlorine dioxide for disinfection
• High-pressure steam for cleaning

Material Properties of NAB (ASTM B148 C95800)

NAB Valve Applications in Desalination

1. Reverse Osmosis (RO) Systems

NAB ball valves and gate valves are extensively used in RO feed lines, brine discharge, and product water piping due to their resistance to chlorine attack and biofilm formation.

2. Multi-Stage Flash (MSF) Distillers

In MSF plants, NAB valves handle hot brine at temperatures up to 120°C, showing excellent resistance to stress corrosion cracking and pitting.

3. Seawater Intake Systems

NAB butterfly valves and check valves at intake structures resist biofouling and maintain reliable operation despite continuous seawater exposure.

4. Chemical Dosing Lines

For anti-scalant and chlorine dosing, NAB valves provide reliable shutoff in chemical service with excellent material compatibility.

Advantages Over Other Materials

Available NAB Valve Types

• NAB Ball Valves: Full port, 2-piece and 3-piece designs
• NAB Gate Valves: API 600 compliant rising stem design
• NAB Globe Valves: Angle and straight pattern for throttling
• NAB Butterfly Valves: Wafer and lug style for large diameters
• NAB Check Valves: Swing check and dual plate designs
• NAB Y-Strainers: Mesh and perforated screens

Technical Specifications

• Standards: API 600, API 608, API 609, ASME B16.34
• Size Range: 1/2" to 24" (DN15 to DN600)
• Pressure Rating: Class 150 to Class 600
• Temperature Range: -30°C to +200°C
• End Connections: Flanged (ASME B16.5), Threaded (NPT), Butt Weld

Conclusion

Nickel Aluminum Bronze (NAB) valves offer the ideal combination of corrosion resistance, mechanical strength, and cost-effectiveness for desalination plant applications. Their proven performance in harsh seawater and brine environments makes them the standard choice for critical process piping in both RO and MSF desalination facilities.