Core Factory Assemblies
Featured Industrial Water Treatment Systems
Engineered skid-mounted and modular containerized systems delivering continuous, high-efficiency purification across municipal, industrial, and high-salinity recovery operations.
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Technical Whitepaper & Industrial Standards
CE-Marked SWRO Engineering: Architecture, Physics & Metallurgy
Industrial seawater reverse osmosis requires an uncompromising synthesis of hydrodynamics, thermodynamic recovery, and metallurgical integrity to survive the most corrosive marine operating conditions.
CE PED & Machinery Directives
Compliance with the European Union Pressure Equipment Directive (PED 2014/68/EU) and Machinery Directive (2006/42/EC) demands third-party verification of pressure vessel calculations, hydrostatic burst testing up to 1.5× design operating pressure (up to 120 bar), and strict CE mark conformity for all electrical switchgear and automated fail-safe interlocks.
Isobaric Energy Recovery (ERD)
Utilizing state-of-the-art ceramic isobaric pressure exchangers, our systems recover up to 97.5% of the hydraulic pressure energy from concentrated brine streams. This breakthrough drops net energy consumption from historical baselines of >7 kWh/m³ down to an ultra-efficient 2.4 - 3.2 kWh/m³, substantially reducing OPEX for baseload utilities.
Super Duplex 2507 Metallurgy
Seawater at 35,000 to 45,000 mg/L TDS poses extreme crevice and pitting corrosion threats. Tongjie utilizes UNS S32750 (Super Duplex 2507) and SMO 254 high-molybdenum stainless alloys for all high-pressure manifolds, coupled with automatic orbital TIG welding under pure argon backing to guarantee PREN values > 42.
Engineering Assurance: Factory Acceptance Testing (FAT) in Shanghai
Every containerized and skid-mounted seawater desalination plant undergoes rigorous full-load wet Factory Acceptance Testing (FAT) at our Shanghai facility prior to ocean transit. Utilizing specialized high-salinity test bays with simulated seawater dosing (TDS 38,000 ppm, temperature adjusted 15°C - 35°C), our automation engineers verify PLC interlocks, flux rates, high-pressure pump vibrations, membrane salt passage, and automated chemical cleaning (CIP) cycling.
Data-Driven Performance
Industrial Benchmarks & System Capabilities
Engineered to deliver uninterrupted freshwater reliability across extreme maritime, tropical, and hyper-saline desert environments.
99.8%
Membrane Salt Rejection
2.8 kWh
Specific Power Consumption / m³
38+
Patents & Proprietary Algorithms
15 Days
Rapid On-Site Plug-and-Play Start
| System Capacity (m³/day) | Container Footprint | Pretreatment Architecture | High Pressure Metallurgy | Recovery Rate (%) | Energy Recovery |
|---|---|---|---|---|---|
| 50 – 250 m³/d | 1x 20ft High Cube Container | Dual Media Sand + 5µm Cartridge | Duplex 2205 / 316L SS | 40% – 45% | Pressure Exchanger Skid |
| 500 – 1,500 m³/d | 1x 40ft High Cube Container | Ultrafiltration (UF) Hollow Fiber | Super Duplex 2507 | 42% – 48% | Ceramic Rotor Isobaric ERD |
| 2,000 – 5,000 m³/d | Modular Double 40ft Units | DAF (Dissolved Air Flotation) + UF | UNS S32750 / Titanium Gr. 2 | 45% – 50% | Dual High-Flow Isobaric Trains |
| 10,000+ m³/d (Plant-Scale) | Multi-Train Skid Assembly | Automated Gravity Media + UF | Super Duplex + Rubber-Lined CS | 48% – 52% | Integrated Center-Axle ERD Array |
China Supply Chain Resilience
Why Global EPCs Choose Shanghai Tongjie Manufacturing
Combining tier-one Western membrane components with Chinese precision engineering, end-to-end supply chain integration, and rapid fabrication lead times.
Complete Component Integration
We source premium membrane elements (DuPont FilmTec, Hydranautics, Toray) and high-pressure axial piston pumps (Danfoss, Cat Pumps) paired with domestically fabricated ISO shipping containers, custom skid frames, and precision CNC piping. This hybrid manufacturing model cuts CAPEX by 30-45% without compromising mechanical longevity.
Class II Contracting Qualifications
Holding official Chinese Class II qualifications in environmental engineering and mechanical/electrical equipment installation, our 50+ person engineering division executes turn-key EPC skid fabrication, P&ID layout design, finite element stress analysis (FEA), and complete instrumentation programming (Siemens, Allen-Bradley, Schneider).
Containerized Plug-and-Play Mobility
Civil engineering at remote islands and coastal ports is notoriously costly. Our containerized SWRO units arrive with internal climate control, marine-grade epoxy coatings, interior LED lighting, automated chemical dosing skids, and pre-wired switchboards. Simply connect seawater feed, power, and discharge pipelines for immediate commissioning.
Global Deployments
Localized Application Scenarios & Sector Solutions
Customized process configurations engineered to match specific raw water chemistries, fluctuating seasonal salinity, and strict discharge constraints.
Offshore Oil & Gas Platforms
Engineered for hazardous environments (ATEX / IECEx certified instrumentation), compact deck footprints, and vibration resistance. Provides high-purity water for drilling mud formulation, turbine wash, and crew potable supply in the Gulf of Mexico, North Sea, and Persian Gulf.
Island Resorts & Municipalities
Ultra-low acoustic footprint design (< 68 dBA) with multi-barrier sand and ultrafiltration pretreatment to manage seasonal red tide algae and high organic matter. Ensures reliable WHO-standard drinking water for luxury Caribbean, Maldives, and Southeast Asian island resorts.
Coastal Petrochemical Refineries
Integrated high-volume SWRO trains providing boiler feed makeup and cooling tower circulation water. Incorporates second-pass reverse osmosis and EDI polishing skids to achieve conductivity < 0.1 µS/cm and silica rejection > 99.5%, preventing boiler tube scale build-up.
Hyper-Arid Coastal Mining
Designed for copper and lithium processing in arid regions like Chile’s Atacama and Western Australia. High-recovery SWRO arrays provide process water pumped hundreds of kilometers inland, operating continuously under extreme ambient temperatures (up to 50°C).
Turn-Key Lifecycle
Global Delivery & Quality Execution Roadmap
From raw water assay analysis to ocean-freight delivery, our gate-controlled execution eliminates project risk for procurement directors and EPC managers.
01
Feed Water Profiling
Comprehensive laboratory analysis: TDS, SDI15, TOC, silica, barium/strontium scaling indices, and seasonal water temperature extremes.
02
Hydrodynamic Modeling
ROSAm / WAVE simulation projections determining flux rates (GFD), membrane element quantities, vessel configurations, and ERD sizing.
03
Precision Fabrication
CNC pipe fitting, ASME-certified welding, dual-stage pressure vessel assembly, electrical cabinet build with UL/CE labeled switchgear.
04
Wet FAT Testing
Full 72-hour simulated high-salinity load testing in Shanghai. Verification of flow balances, noise levels, interlocks, and SCADA connectivity.
05
Global Commissioning
Sea container shipping, on-site supervision or remote AR-guided start-up, operator training, and supply of 2-year maintenance spares.
Expanded Membrane Solutions
Specialized Desalination, Solar-Powered & ZLD Equipment
Engineered to bridge seawater extraction with advanced industrial wastewater concentration and off-grid renewable applications.
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Engineering Knowledge Base
Frequently Asked Questions (FAQ) for Engineering Buyers
Direct technical insights to guide your system sizing, specification comparisons, and compliance verifications.
What specific CE directives apply to Tongjie Seawater Desalination Plants?
Our systems comply with the European Union Pressure Equipment Directive (PED 2014/68/EU), Machinery Directive (2006/42/EC), and Low Voltage Directive (2014/35/EU). High-pressure piping manifolds, FRP membrane housings, and accumulator vessels are calculated and stamped in accordance with ASME Section VIII / EN 13445 codes. Complete documentation dossiers (WPS/PQR welding qualification records, hydro-test charts, CE Declarations of Conformity) are furnished with every shipment.
How does the isobaric Energy Recovery Device (ERD) affect lifecycle OPEX?
Seawater desalination requires overcoming osmotic pressures exceeding 27-30 bar, demanding system operating pressures of 55 to 70 bar. Without energy recovery, high-pressure brine discharging to the sea wastes massive hydraulic power. By incorporating ceramic rotor isobaric pressure exchangers, up to 97.5% of this pressure energy is transferred directly to the incoming raw seawater feed, reducing power demand by 50-60%. For a 1,000 m³/day plant, this represents operational savings of over $120,000 USD annually depending on localized kWh electricity tariffs.
What metallurgy is utilized to prevent pitting and crevice corrosion?
Standard 304 or 316 stainless steels suffer rapid pitting and stress corrosion cracking when exposed to warm, aerated seawater high in chlorides (> 19,000 mg/L Cl⁻). Tongjie specifies Super Duplex Stainless Steel 2507 (UNS S32750) or 6-Moly alloys (SMO 254) with Pitting Resistance Equivalent Numbers (PREN) > 42 for all high-pressure piping. Low-pressure suction and reject lines utilize corrosion-proof glass-fiber reinforced plastic (GRP/FRP) or heavy-wall schedule 80 PVC/PVDF.
Can containerized SWRO units run directly on off-grid solar or wind power?
Yes. Tongjie designs specialized direct-drive and hybrid solar-coupled containerized plants. Using intelligent Variable Frequency Drives (VFD) coupled with Schneider or Siemens PLCs, our algorithms dynamically ramp high-pressure pump speeds in real-time according to fluctuating solar irradiance (PV yield) while preserving membrane flux balance and preventing premature membrane compaction or scaling.
What pretreatment is necessary to protect reverse osmosis membranes?
Raw open-intake seawater requires strict SDI15 (Silt Density Index) control below 3.0 before entering high-pressure membranes. Tongjie standard trains utilize multi-media filtration (silica sand + anthracite) followed by 5-micron and 1-micron melt-blown polypropylene safety filters. For locations susceptible to severe algal blooms, suspended sediments, or oil sheens, we integrate Dissolved Air Flotation (DAF) and pressurized PVDF Ultrafiltration (UF) hollow fiber membrane barriers.
What are the typical lead times for modular containerized systems?
Standard containerized units (e.g., 100 m³/d, 250 m³/d, 500 m³/d) maintain standardized engineering blueprints, allowing complete fabrication, piping assembly, painting, and FAT verification within 6 to 9 weeks from order confirmation. Custom project architectures with specialized metallurgy (Titanium, Hastelloy) or hazardous-area electrical requirements (ATEX Zone 1/2) are typically completed in 10 to 14 weeks.
Custom Process Design
Request an Engineered Proposal & Sizing Calculation
Submit your raw water assay (TDS, temperature, seasonal turbidity) and required daily output. Our senior membrane engineering team will return a comprehensive projection, P&ID layout, and detailed CAPEX/OPEX model within 24 hours.