Concentrated brine at the back end of an MSF or MED plant pushes chloride resistance requirements beyond what standard duplex handles comfortably — extended design life expectations add further margin pressure.
| Dominant Failure Mode | Chloride stress-corrosion cracking in concentrated brine |
| Governing Standard | General ASME/TEMA, extended design life expectations |
| Typical Material Default | Super Duplex 2507, Titanium Grade 2 |
| Typical Structural Type | Floating, for full cleaning access and thermal cycling accommodation |
Brine concentration stage typically drives material selection beyond standard duplex.
As seawater is concentrated through the desalination process, chloride concentration rises significantly at the back end, pushing corrosion risk beyond what's adequate at the feed intake stage.
Often yes, but the most aggressive brine chemistry and highest design-life expectations sometimes favor titanium instead — a direct cost-over-lifecycle comparison is worth doing for large plants.
Desalination plants often target multi-decade service lives, which can justify a higher initial material cost (titanium over duplex, for example) if it meaningfully reduces mid-life replacement risk.
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