Seawater Reverse Osmosis & High-Pressure Desalination Systems
Extreme chloride concentrations (up to 48,000 mg/L TDS) and operating pressures reaching 85 bar require uncompromised metallurgy (Super Duplex 2507 / 6Mo / Hastelloy C-276) and cavitation-resistant trimming to prevent localized crevice corrosion and energy dissipation across high-pressure membrane blocks.
High-Pressure Membrane Racks
85-bar High Flux Trains
Energy Recovery System
Isobaric Rotor Pressure Exchange
Metallurgy Compliance
Zero Crevice Corrosion Verification
Duty Zones & Flow Control Infrastructure
From intake ultrafiltration through 85-bar membrane pressurization and isobaric energy exchange, every valve and pump matches exact chemical aggressivity parameters.
Intake & Pre-Treatment
Ultrafiltration, Dual Media Filters, Sodium hypochlorite dosing
HP Feed & Boosters
High-pressure booster skids, heavy manifold headers
Membrane Trains
SWRO vessels, high velocity brine reject headers
Energy Recovery
Isobaric rotor chambers, pressure exchange 3-way distribution
Post-Treatment
Permeate remineralization, calcite beds, lime dosing
High-Pressure Feed & Seawater Intake
Handling raw seawater prior to desalination skids requires biocide resistance and heavy mechanical isolation against surge hammering during pump cut-in.
- check_circleDesign Pressure: 10 to 85 bar (PN16 - PN100)
- check_circleBody Material: Duplex 2205 / Super Duplex 2507
- check_circleCritical Concern: Marine biofouling & cavitation damage
RO Membrane Trains & Brine Reject
High velocity concentrated brine creates severe turbulence and localized chloride attack on valve seats, stem packings, and manifold tie-ins.
- check_circleChlorides: Up to 72,000 ppm in reject stream
- check_circleTrim: Stellite 6 or Hardened 254 SMO / Ceramic
- check_circleShutoff Class: API 598 Zero Bubble Leakage
Energy Recovery & Remineralization
Isobaric pressure exchangers recover up to 98% of brine energy. Valve cycling frequency is exceptionally high, demanding instant dynamic closure.
- check_circleEfficiency: < 2.5 kWh/m³ net power
- check_circleCycle Life: Tested to > 250,000 rapid cycles
- check_circlePotable Cert: NSF/ANSI/CAN 61 & BS 6920
Desalination Equipment Selector & Package Configurator
Configure feed parameters, view certified metallurgical matches, and commit assemblies directly to your engineering RFQ basket.
VALVEX TOV-900 Super Duplex
TAG: SWRO-TOV-2507-CL600
Triple-offset conical non-rubbing seat geometry eliminates galling in chloride-heavy seawater, delivering bi-directional bubble-tight isolation with zero pitting degradation.
VALVEX SWRO-HPP Axially Split
TAG: SWRO-HPP-BB3-65
API 610 BB3 design engineered specifically for membrane feedwater delivery. Opposed impeller arrangement balances hydraulic axial thrust without balance disk leakage losses.
VALVEX Non-Slam Dual Plate Check
TAG: SWRO-DCV-2507-PN100
Essential membrane protection located immediately down-stream of feed pumps. Independent spring-loaded plates close prior to velocity reversal, completely eliminating catastrophic hydraulic hammer.
Rigorous SWRO Metallurgy Verification
All materials intended for seawater contact undergo mandatory destructive and non-destructive laboratory evaluation. We guarantee absolute compliance with NORSOK M-630 and ASTM international standards.
Zero pitting corrosion observed during 24-hour ferric chloride immersion test with weight loss under 20 mg/m².
| Verification Procedure | Standard | Acceptance Criteria | Frequency |
|---|---|---|---|
| Ferric Chloride Pitting TestMethod A (Crevice/Pitting) | ASTM G48 | No pitting at 50°C, weight loss < 20 mg/m² | Every Heat / Cast Lot |
| Microstructure & IntermetallicFerrite/Austenite 40/60% | ASTM A923 M-B/C | Zero sigma/chi phase, impact > 80J @ -40°C | Per Forging Batch |
| Positive Material IdentificationXRF Handheld & Spark OES | API RP 578 | Cr:24-26, Mo:3-5, Ni:6-8, N:0.24-0.32 | 100% All Pressure Parts |
| Hydrostatic Containment TestShell & High-Pressure Seat | API 598 / ISO 5208 | 1.5x CWP (127.5 bar on 85 bar line) | 100% Every Serial Unit |
| Fugitive Emissions VerificationHelium Leak Sniffer | ISO 15848-1 AH | Leakage < 10⁻⁶ mg·s⁻¹·m⁻¹ over 2,500 cycles | Batch Sample |
Global SWRO Reference Track Record
Over 45,000 Super Duplex valves and high-pressure pumping units active across the world's most demanding hyper-saline desalination projects.
Taweelah RO Mega-Desalination Facility
World’s largest reverse osmosis plant producing 909,000 m³/day of potable water. VALVEX delivered 1,200 Super Duplex 2507 TOV-900 isolation valves across 30 identical high-pressure membrane blocks.
Claude "Bud" Lewis Carlsbad Plant Loop Optimization
Supplying 10% of San Diego County's total potable water. VALVEX engineered dynamic non-slam check assemblies and dual-offset ceramic-seat valves to curb pressure dissipation across the isobaric ERD loop.
Need Exact Metallurgy Guidance for Your SWRO Plant Project?
Our Senior Metallurgists and Flow Process Specialists provide certified Cv sizing, water hammer transient analysis, and PREN-calculated alloy selections tailored to your exact salinity and temperature data.