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Water Treatment & Desalination
Defeating Chloride Corrosion in Seawater Desalination (SWRO & MSF) |Optimizing Lifecycle Costs (LCC) with Strategic Material Selection
Page Overview
Water is the resource of the future, but in desalination, Chloride ions are the relentless enemy of infrastructure. Tsisco Industrial Ltd. brings specialized metallurgical solutions to the Water Treatment sector. Whether for high-pressure Seawater Reverse Osmosis (SWRO) pumps or thermal Multi-Stage Flash (MSF) evaporators, our portfolio is engineered to prevent pitting and crevice corrosion, ensuring water security for arid regions.
1. The Critical Zone: High-Pressure SWRO (Reverse Osmosis)
The Challenge: In SWRO plants, high-pressure pumps and manifolds operate at pressures up to 70-80 bar with highly saline seawater. This combination creates an aggressively corrosive environment where standard 316L stainless steel often fails due to Pitting and Crevice Corrosion.
The Solution:
* Super Austenitic & Super Duplex: We supply Super Austenitic Stainless Pipes (P26) (such as 254SMO/904L) and Super Duplex (2507) materials.
* Performance: These alloys feature a Pitting Resistance Equivalent Number (PREN) > 40, providing an impenetrable barrier against chlorides even in stagnant or high-velocity conditions.
Mapped Products:
* [P26] Super Austenitic Stainless Pipe: 6Mo and 904L grades for high-pressure manifolds.
P26 Super Austenitic Stainless Pipe
6Mo and 904L grades for high-pressure manifolds.
* [P33] Water Treatment Steel: Specialized duplex plates for high-pressure vessels.
P33 Water Treatment Steel
Specialized duplex plates for high-pressure vessels.
2. The Economic Zone: Low-Pressure & Storage Lines
The Challenge: For product water lines, permeate storage, and low-pressure auxiliary systems, using Super Duplex is engineering overkill and financially inefficient. However, standard 304/316 grades still pose a risk of pitting over long periods.
The Solution:
* The Nickel-Free Alternative: Tsisco champions the use of Ultra-Pure Ferritic Stainless Pipe (P27), specifically Grade 444.
* Cost Efficiency: Being nickel-free, Grade 444 is immune to volatile nickel market prices, offering stable costing. technically, it offers pitting resistance superior to 316L, making it the perfect "Smart Engineering" choice for water storage and distribution.
Mapped Products:
* [P27] Ultra-Pure Ferritic Stainless Pipe: Grade 444/439 for cost-effective, pitting-resistant piping.
P27 Ultra-Pure Ferritic Stainless Pipe
Grade 444/439 for cost-effective, pitting-resistant piping.
3. Thermal Desalination: MSF & MED
The Challenge: In Multi-Stage Flash (MSF) and Multi-Effect Distillation (MED) plants, heat transfer efficiency and resistance to hot brine are paramount.
The Solution:
* The Marine Standard: We supply traditional Copper-Nickel Alloy Tubes (P19) (CuNi 90/10 and 70/30). These materials are legendary for their thermal conductivity and natural resistance to marine bio-fouling, essential for condenser tubes and heat exchangers.
Mapped Products:
* [P19] Copper-Nickel Alloy Tube: For evaporators and brine heaters.
P19 Copper-Nickel Alloy Tube
For evaporators and brine heaters.
Technical Deep Dive: The PREN Strategy
We select materials based on science, not guesswork. The Pitting Resistance Equivalent Number (PREN) is our guiding metric:
* Standard Service: PREN > 24 (Grade 316L)
* Severe Service: PREN > 40 (Super Duplex 2507 / Super Austenitic P26).
Tsisco ensures that for every specific zone in your desalination plant, the material provided exceeds the critical pitting temperature (CPT) requirement of the fluid.
