Seawater Desalination Applications
Seawater desalination involves high-salinity, chloride-rich corrosive media. The selection and design of equipment materials depend heavily on the service environment. Materials used for desalination plants must deliver outstanding corrosion resistance, reliable durability and long service life under direct, continuous contact with concentrated seawater.
HSMetal supplies corrosion-resistant alloys covering copper alloys, titanium alloys and nickel-containing high-performance alloys. Our materials serve desalination heat exchangers, condensers, evaporator tubing, high-pressure piping, pumps, valves and SWRO (seawater reverse osmosis) components. We support desalination equipment manufacturers and EPC contractors with stable, specification-compliant raw-material solutions.Our materials are available in tubes, pipes, plates, bars, and custom forms, meeting ASTM, ASME, and international standards for multi-stage flash (MSF), multi-effect distillation (MED), and seawater reverse osmosis (SWRO) systems.
Core Performance Requirements for Desalination Materials
- Superior Corrosion Resistance – Resistance to pitting, crevice corrosion, stress corrosion cracking (SCC), and erosion-corrosion in high-chloride, high-temperature brine environments.
- Biofouling Resistance – Materials must resist marine organism attachment, which can reduce heat transfer efficiency and increase flow resistance.
- High-Temperature Stability – Equipment such as evaporators and brine heaters operate at elevated temperatures (up to 130°C in some applications), requiring materials that maintain mechanical properties and corrosion resistance under sustained thermal exposure.
- Fabricability & Weldability – Tubes, pipes, and fittings must be readily formable, bendable, and weldable for complex desalination plant layouts.
- Long Service Life & Low Maintenance – Materials must deliver decades of reliable performance with minimal maintenance to ensure cost-effective water production.
Copper Alloys - Heat Exchangers, Condensers & Evaporator Tubing
Copper-nickel alloys and aluminum brass are classic materials for desalination heat-transfer components, offering excellent seawater-corrosion resistance and effective bio-fouling inhibition.Copper-nickel alloys are the most widely used materials for seawater piping, heat exchangers, condensers, and evaporator tubing in desalination plants. They offer an exceptional combination of seawater corrosion resistance, biofouling resistance, thermal conductivity, and fabricability.
C70600 (90/10 Copper-Nickel) – The industry workhorse for seawater service. This alloy exhibits excellent resistance to seawater corrosion, erosion, and biofouling. It has been used successfully in desalination plants, offshore platforms, and marine engineering for decades, with documented service life exceeding 8 years at annualized failure rates as low as 0.044–0.096%. Applications include:
- Seawater piping systems
- Heat exchanger and condenser tubing
- Tube sheets and water boxes
- Flash chambers in MSF plants
C71500 (70/30 Copper-Nickel) – A higher-nickel version offering superior overall seawater corrosion resistance compared to C70600. Widely used in:
- Condenser and saltwater tubing for naval and commercial marine applications
- Premium heat exchanger tubes in desalination plants
- Tube sheets and welding filler metal
- Tidewater power plants, oil refineries, and chemical processing
HAl77-2 (Aluminum Brass) – A copper-zinc-aluminum alloy with good resistance to seawater corrosion and biofouling, commonly used in heat exchanger and condenser tubing in desalination and power generation applications.
Titanium Alloys - Heat-Transfer Tubes, High-Pressure Vessels & Anodes
Titanium and its alloys offer exceptional corrosion resistance in seawater and chloride environments, particularly where high temperatures, high flow velocities, or crevice conditions exist. Titanium is immune to pitting and crevice corrosion in seawater, making it the material of choice for the most demanding desalination applications.
Grade 2 (Commercially Pure Titanium) – The most widely used general-purpose titanium grade. Offers a balanced combination of strength, formability, and outstanding corrosion resistance in seawater and chloride service. Applications include:
- Seawater desalination steam condenser pipes
- Seawater coolers and condensers
- Heat exchanger tubes in chloride service
- SWRO high-pressure piping systems
Grade 12 (Ti-0.3Mo-0.8Ni) – A titanium-molybdenum-nickel alloy with higher strength than Grade 2 and improved crevice corrosion resistance in hot brine environments. Specifically designed for:
- Elevated-temperature seawater heaters (up to 130°C)
- Chemical processing and hot brine service
- High-temperature heat exchangers and condensers
- Desalination plant components requiring enhanced crevice corrosion resistance
Grade 7 (Ti-0.15Pd) – A titanium-palladium alloy offering superior crevice corrosion resistance in chloride and seawater environments. Used in higher-temperature seawater heaters and critical desalination components.
TC4 (Grade 5 / Ti-6Al-4V) – High-strength titanium alloy used in specialized desalination applications requiring exceptional mechanical properties combined with corrosion resistance, including high-pressure pump components and structural fittings.
Titanium materials are frequently applied to heat-transfer tubes, high-pressure vessels and anodes in aggressive desalination environments, where long-term reliability is critical.
How to Select the Heat-Exchanger Tube for Seawater Desalination Between Titanium vs. Inconel 625>>
High-Performance Alloys - Pumps, Valves, Piping & High-Pressure SWRO Components
Nickel-based superalloys provide the highest level of corrosion resistance for the most demanding desalination applications – particularly in high-pressure pumps, valve trim, and components exposed to concentrated brine and high chloride levels.
Inconel 625 (UNS N06625) – A nickel-chromium-molybdenum-niobium alloy offering outstanding resistance to chloride-induced pitting, crevice corrosion, and stress corrosion cracking. In one documented case, a desalination plant high-pressure pump impeller made from Inconel 625 operated continuously for 5 years in seawater with 35,000 mg/L chloride content, with only 0.1 mm of corrosion – representing a service life 8 times longer than conventional materials. Applications include:
- SWRO high-pressure pump impellers and casings
- Valves and brine-side manifolds
- Seawater piping and fittings
- Offshore desalination plant components
How to Select the Heat-Exchanger Tube for Seawater Desalination Between Titanium vs. Inconel 625>>
Monel 400 (UNS N04400) – A nickel-copper alloy renowned for its exceptional resistance to seawater and chemical corrosion, strong resistance to chloride stress corrosion cracking, and excellent machinability. Widely used in:
- Marine heat exchangers and desalination systems
- Evaporators, condensers, and boiler feedwater heaters
- Salt production equipment and marine chemical processing
Monel K500 (UNS N05500) – A precipitation-hardened version of Monel 400 offering higher strength and hardness for pump shafts, valve stems, fasteners, and wear-resistant components in desalination plants.
In seawater desalination facilities, pumps, valves, high-temperature pipelines and SWRO units require materials capable of withstanding continuous saline erosion and high-pressure operation. HSMetal supplies appropriate high-performance alloys for these demanding applications.
Industry Standards & Compliance
HSMetal desalination materials are supplied to meet or exceed the following industry standards:
- ASTM B552 – Seamless and welded copper-nickel tubes for heat exchangers in water desalting plants
- ASTM B338 – Titanium and titanium alloy seamless and welded tubes for condensers and heat exchangers
- ASTM B127 – Nickel-copper alloy plate, sheet, and strip (Monel 400)
- ASTM B443 – Nickel-chromium-molybdenum-niobium alloy plate, sheet, and strip (Inconel 625)
Full traceability and material test reports (MTR) provided with every shipment
HSMetal Supply Advantages – Your Desalination Material Partner
- Proven Corrosion Performance – All materials are selected and tested for long-term resistance to high-chloride, high-temperature seawater environments.
- Comprehensive Grade Portfolio – From copper-nickel and titanium to nickel-based superalloys, we supply the full spectrum of desalination materials.
- Diverse Product Forms – Available in tubes, pipes, plates, sheets, bars, strips, wires, and custom shapes.
- Full Traceability & Certification – Mill test reports (MTR) and material certifications provided with every shipment.
- Global Supply Reliability – Serving EPC contractors, desalination plant operators, and equipment manufacturers worldwide.
- Technical Support – Our metallurgists assist with material selection, corrosion mitigation strategies, and welding procedure qualification.
We supply plates, bars, tubes, forgings and seamless pipe products in corrosion-resistant alloys, complying with international desalination and marine-industry specifications. We provide stable raw-material solutions for desalination equipment manufacturers, engineering contractors and seawater-treatment project developers.
Core Applications and Recommended Grades
| Material Category | Key Desalination Applications | Recommended Grades |
|---|---|---|
| Copper-Nickel Alloys | Heat exchanger tubing, condensers, evaporator tubes, seawater piping, flash chambers, tube sheets | C70600 (90/10 Cu-Ni), C71500 (70/30 Cu-Ni), HAl77-2 (Aluminum Brass) |
| Titanium Alloys | Heat transfer tubes, condensers, seawater coolers, high-pressure SWRO piping, elevated-temperature brine heaters | Grade 2, Grade 12, Grade 7, TC4 (Grade 5) |
| Nickel-Based Superalloys | SWRO high-pressure pump impellers & casings, valves, brine manifolds, seawater piping, evaporators, condensers | Inconel 625, Monel 400, Monel K500 |
