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.

Frequently Asked Questions (FAQ)

1. What is the difference between single-stage RO and double-stage RO desalination?
Single-stage reverse osmosis uses one set of RO membranes to treat seawater in a single pass, typically producing water with TDS levels of 200-500 mg/L depending on feed water conditions. Double-stage reverse osmosis, as featured in this system, uses two sequential RO stages:

First Stage: Removes the majority of dissolved solids from seawater, reducing TDS from approximately 35,000 mg/L to around 500-1,000 mg/L.
Second Stage: Polishes the first-stage permeate, achieving final TDS below 5 mg/L.
The double-stage configuration delivers significantly higher purity water (pure water quality), making it suitable for applications requiring ultra-low TDS, such as boiler feed water, high-purity process water, and premium potable water.

2. What water quality can I expect from this double RO system?
Our double RO system produces water with total dissolved solids (TDS) below 5 mg/L, achieving a desalination rate exceeding 99.5%. This means that from typical seawater with 35,000 mg/L TDS, the product water contains less than 5 mg/L of dissolved solids. This level of purity meets or exceeds standards for:

Potable drinking water (WHO and international standards)
Boiler feed water for low and medium-pressure boilers
High-purity process water for industrial applications
Medical and laboratory-grade water (with optional post-treatment)

3. How does the system protect itself from damage during operation?
The system incorporates multiple safety features to protect equipment and ensure reliable operation:

High-Pressure Protection: If the high-pressure pump outlet pressure exceeds 6.2 MPa, the system automatically shuts down and activates audible and visual alarms, preventing membrane damage and equipment failure.
Low-Pressure Protection: If pretreatment water supply is insufficient and inlet pressure drops below 0.05 MPa, the system automatically stops, protecting the high-pressure pump from cavitation damage.
Automatic Controls: PLC-based control system monitors operating parameters and initiates protective actions when parameters deviate from normal ranges.
Alarm System: Audible and visual alarms alert operators to abnormal conditions requiring attention.

4. What maintenance is required for the reverse osmosis membranes?
Regular maintenance is essential for optimal membrane performance and longevity:

Physical Cleaning: Periodic backwashing and flushing of the pretreatment system using the manual multi-way valve removes accumulated particulates.
Chemical Cleaning: The integrated membrane cleaning system allows for chemical cleaning when membrane performance declines (typically every 3-12 months depending on feed water quality and operating conditions). This removes fouling and scaling that physical cleaning cannot address.
Membrane Preservation: When the system is not in operation for extended periods, the membranes can be preserved with appropriate chemical solutions to prevent biological growth and membrane degradation.
Performance Monitoring: Regular monitoring of permeate flow, pressure differentials, and product water quality helps identify when cleaning is required.
With proper maintenance, RO membranes typically achieve 3-7 years of service life.

5. Can this system be customized for different capacities or applications?
Yes, the WY-FSHB-120-2 is one configuration in our broader desalination product line. We offer:

Capacity Variations: Systems ranging from small-scale units (1-10 TPD) to large industrial systems (500+ TPD) can be designed to meet specific requirements.
Voltage and Frequency Options: Systems can be configured for various electrical standards (60Hz, different voltages, single-phase) for international applications.
Material Upgrades: Special materials available for aggressive environments or specific water chemistry requirements.
Control System Customization: Options for remote monitoring, data logging, and integration with vessel or facility control systems.
Containerized Systems: Skid-mounted or containerized configurations available for rapid deployment and easy installation.

Attention please: The description was copied from different cooperating manufacturers. The description may be different with the goods, please check with us when order.

Tag: Our other products
Click here to contact us via whatsapp