Industry procurement solution · Reviewed 10 August 2026
Metals for Water Treatment and Desalination
Water-treatment metal selection begins with feed and concentrate chemistry, chlorides, oxidants, pressure, temperature, velocity, stagnation, crevices, cleaning and dissimilar-metal interfaces—not a generic stainless grade list.
Answer first
There is no single metal specification for an entire project
Divide the project into systems, document each service environment and governing code, then select compatible materials, product standards, fabrication routes, protection systems and inspection plans.
Raw water, brackish water, seawater, concentrate and chemical dosing with different corrosion severity
High-pressure membrane trains, variable velocity, shutdown stagnation and oxygen or disinfectant transients
Wet external areas, insulation, splash, leaks and mixed-metal supports
System map
Material and product selection by project system
| System | Selection drivers and alternatives | Reviewed starting points |
|---|---|---|
| Intake and pretreatment |
| Carbon steel pipeStainless sheet |
| High-pressure membrane piping |
| 2507Stainless pipe |
| Chemical dosing and cleaning |
| 316LStainless pipe |
| Skids, tanks and external structures |
| Stainless sheetGalvanized coil |
Project control
Standards, certification and documents
- Design basis with complete feed, product, concentrate and cleaning chemistry
- Process line list, pressure class, corrosion study and materials selection report
- Welding, PMI, passivation, NDE, pressure-test and coating procedures
- Material certificates, weld map, inspection plan and turnover dossier
Fabrication and logistics
Package interfaces to control
- Fabrication drawings, welding, heat treatment, coating and repair procedures
- Inspection hold points, testing methods, acceptance criteria and document approval
- Identification through cutting and assembly, preservation, packing and consolidated shipping
- Destination rules, site storage, installation interfaces and delivery sequence
Risk register
Common procurement risks
Assuming 316L is universally seawater resistant
Ignoring stagnation, crevices, oxidant spikes or concentrate chemistry
Mixing grades during fabrication without positive material identification
Specifying pipe without compatible fittings, weld consumables, valves and test requirements
Comparable offers
Structured RFQ checklist
Project location, service environment, design life and governing codes
System or component, selected material and governing product specification
Dimensions, tolerances, quantity and required delivery sequence
Condition, finish, metallic coating, paint system or corrosion allowance
Fabrication, forming, welding, heat treatment and qualification requirements
Inspection and test plan, acceptance criteria, certificates and hold points
Marking, traceability, packing, preservation and destination
Required delivery date, shipment terms and approved-vendor constraints
Evidence
Sources and review
Project engineering documents and current governing standards supersede this general selection map.
U.S. Bureau of Reclamation · Desalination and Water Purification Research Report 158
U.S. Bureau of Reclamation · High-velocity and static metallic-material testing
worldstainless · Industry technical guide, reviewed July 2026
Project sourcing from China
Build a traceable Water treatment & desalination supply package
Share the design basis, system list, specifications, quantities, inspection plan, destination and delivery schedule.