B06 · Seawater Desalination

Select and List 4 Parts for Stainless Steel Desalination

Commonly Used: 2507 / 2205 / 316L, Thickness from 2–15 mm

Explain Operating Conditions, Get Material Advice View Product

Stainless water tanks, pumps, and large-diameter pipes for water treatment — Water treatment and drainage: Tanks, pumps, and large-diameter pipe (schematic; actual selection based on medium, temperature, and drawings)

List of parts and materials for four sections

Section / Part	Recommended designation	Specification / Thickness	Surface	Main Failure Modes	Reference Standards
RO High-Pressure Pump/Energy Recovery Device	2507（S32750/1.4410）	Casting/Forging/Tube	Surface/Passivation	High Pressure Sea Water 60–80 bar + Cl⁻ + Cavitation Corrosion	ASTM A240；EN 10217-7；NORSOK M-650
Sea Water Feed Pipes/Vessels	2507/2205	Pipe Wall 2–15 mm	Passivation	High Chloride Sea Water + High Speed Scrubbing + Crevice Corrosion	ASTM A240/A789；EN 10217-7
RO Membrane Shell/Filter	316L/2205/2507	2–10mm	Passivation / 2B	High Pressure Sea Water Corrosion + Membrane Contamination	ASTM A240；GB/T 3280
Dechlorinated Water Delivery Pipes	304L/316L	2–8mm	2B / Passivation	Low Chloride Product Water + External Atmosphere	GB/T 3280

Table showsStandard Configurations.Different parts may require 304, 316L, or 2205 based on usage conditions and materials, temperatures, and welding methods. Clearing the details saves time.

Key Considerations

The most common grades are 2507 (3), 2205 (2), and 316L (2). The numbers in parentheses indicate the number of affected areas for quoting and material preparation.
Common Corrosion Sources: Chlorides and salts (4/4 hits).
Thickness range: 2–15 mm. Thin plates are mostly formed parts, considering bending rebound and deep drawing cracks; thick plates are mostly welded structural components, considering heat input and sensitization.

Common Issues

Which stainless steel is used most for desalination?

Based on the total of these four areas, 2507 (3), 2205 (2), and 316L (2) appear most frequently. Specific to a part depends on the medium and temperature; for example, stainless countertops that come into contact with salt water should switch from 304 to 316L.

Most Common Problems

Which parts are prone to issues?

Based on failure descriptions, typical examples include "RO high-pressure pump/energy recovery device": High pressure seawater (60–80 bar) + Cl⁻ + cavitation corrosion. Recommended grade: 2507 (S32750/1.4410), specifications: cast/forged/tube. For these conditions, it's recommended to specify the medium concentration, temperature, and cleaning method in the design phase.

What thickness should be selected?

The listed thickness range is 2–15 mm. Thin plates are considered for forming and surface quality; thick plates are considered for welding strength and structural integrity. Different manufacturers may have different values for the same part based on your drawings or operating conditions, so review them accordingly.

Applications4

Thickness2–15mm

Grades250