Marine Desalination Equipment

Access to reliable, high-quality freshwater is a critical requirement for maritime operations, offshore platforms, and coastal facilities. Our Double RO Seawater Desalination Equipment represents the pinnacle of advanced water treatment technology, utilizing international state-of-the-art reverse osmosis (RO) systems to convert seawater into high-purity freshwater suitable for drinking, boiler feed, and industrial applications.

Engineered with a two-stage reverse osmosis design, this system delivers exceptional water quality with total dissolved solids (TDS) below 5 mg/L and a desalination rate exceeding 99.5%. The system effectively removes inorganic salts, heavy metal ions, organic compounds, bacteria, and other harmful contaminants from seawater, ensuring a safe and reliable freshwater supply even in the most demanding marine environments.

Advanced Two-Stage Reverse Osmosis Technology

Our double RO system employs a sophisticated two-stage membrane configuration to achieve superior water purity:

First Stage Reverse Osmosis: Seawater is initially treated through high-pressure RO membranes operating at 3.5 to 5.5 MPa, removing the majority of dissolved solids and achieving a recovery rate of approximately 45%. This stage handles the heavy lifting of desalination, effectively reducing salinity from typical seawater levels of 35,000 mg/L to manageable levels.
Second Stage Reverse Osmosis: The permeate from the first stage is further purified through a second set of RO membranes operating at lower pressure (0.5 to 1.5 MPa). This polishing stage achieves an exceptional recovery rate of approximately 85% and produces water with TDS below 5 mg/L, meeting the highest purity standards for pure water applications.

This two-stage configuration not only delivers superior water quality but also optimizes energy efficiency and extends membrane life by distributing the purification workload across two membrane arrays.

Robust Construction for Marine Environments

Built to withstand the harsh conditions of marine and offshore installations, the equipment features:

SUS316 Stainless Steel Construction: All wetted components and structural elements are fabricated from high-grade stainless steel for exceptional corrosion resistance in saltwater environments.
IP54 Protection Rating: Electrical components are protected against dust and water ingress, ensuring reliable operation in marine conditions.
Integrated Safety Systems: Comprehensive protection features safeguard the equipment and ensure operator safety.

Comprehensive System Functions

The system is equipped with advanced monitoring and protection features:

High-Pressure Unloading Protection: Automatically stops the equipment and activates audible/visual alarms when the high-pressure pump outlet pressure exceeds 6.2 MPa, preventing system damage.
Low-Pressure Shutdown Protection: Automatically stops the equipment and activates alarms when pretreatment water supply is insufficient and inlet pressure drops below 0.05 MPa, protecting the high-pressure pump from cavitation damage.
Automatic Backwash System: Manual multi-way valve enables large-flow backwashing and full washing of the pretreatment system, maintaining optimal filtration performance.
Integrated Membrane Cleaning System: Onboard chemical cleaning system allows for physical cleaning, chemical cleaning, and membrane preservation, extending membrane life and maintaining performance.

Key Features & Benefits

✅ Double RO Technology: Two-stage reverse osmosis design delivers exceptional water purity with TDS below 5 mg/L.
✅ High Desalination Rate: Greater than 99.5% salt rejection for reliable freshwater production.
✅ Superior Product Water Quality: Produces pure water meeting the highest standards (TDS < 5 mg/L).
✅ Robust Marine Construction: SUS316 stainless steel components ensure long-term corrosion resistance.
✅ Comprehensive Safety Systems: High-pressure and low-pressure protection with audible/visual alarms.
✅ Integrated Cleaning Capability: Onboard membrane cleaning system extends membrane service life.
✅ Customizable Design: Tailored configurations available to meet specific capacity and application requirements.
✅ Marine-Grade Protection: IP54 rated electrical components for reliable operation in harsh environments.

Technical Specifications

Parameter	Specification
Model	WY-FSHB-120-2
Water Yield	5,000 Liters per Hour (120 Tons per Day)
RO Product Water Quality	TDS < 5 mg/L
Desalination Rate	> 99.5%
Output Water Salinity	< 5 mg/L
First Stage Recovery Rate	45% (depending on temperature and inlet water quality)
Second Stage Recovery Rate	85% (depending on temperature and inlet water quality)
First Stage Operating Pressure	3.5 – 5.5 MPa
Second Stage Operating Pressure	0.5 – 1.5 MPa
Power	45 kW
Voltage	AC 400V / 50Hz / Three Phase
Protection Rating	IP54
Material Composition	SUS316 Stainless Steel

Notes:

*Water yield is rated at inlet water temperature of 25°C, salinity of 35,000 mg/L, and operating pressure of 5 MPa.*
Custom configurations available upon request to meet specific customer requirements.

Applications

Commercial Vessels: Freshwater supply for crew, hotel services, and equipment cooling on cargo ships, tankers, and passenger vessels.
Offshore Platforms: Reliable freshwater production for platforms, rigs, and floating production facilities.
Naval Vessels: High-purity water for onboard systems, equipment cooling, and potable water supply.
Coastal Facilities: Desalination for coastal communities, resorts, and industrial facilities with limited freshwater access.
Island Installations: Self-sufficient freshwater production for remote island communities and facilities.
Emergency Response: Mobile desalination capabilities for disaster relief and humanitarian operations.

System Components

Pretreatment System: Multi-media filtration, cartridge filtration, and chemical dosing for feed water conditioning.
High-Pressure Pump: First stage pump delivering 3.5-5.5 MPa operating pressure.
First Stage RO Membranes: High-rejection seawater membranes for primary desalination.
Second Stage RO Membranes: Polishing membranes for final purification.
Cleaning System: Integrated chemical cleaning system for membrane maintenance.
Control System: PLC-based control with HMI for monitoring and operation.
Instrumentation: Pressure gauges, flow meters, conductivity meters, and temperature sensors for system monitoring.