Marine water maker for boat 20m3pd — Oman
Design points of the case:
We designed and built two compact marine water makers for vessels under construction at Oman and Turkey shipyards. Each marine water maker produces 20 cubic meters of fresh water daily, converting seawater into drinking-quality water for crew use.
To fit through narrow cabin entrances, the system was split into two modular units:
1.Pre-filtration Module
Three-stage filtration (bag filter → 5-micron filter → 1-micron filter)
Mounted on a single frame for easy installation.
2.Reverse Osmosis (RO) Module
Includes a high-pressure pump, two 8040 RO membranes, and controls.
Housed on a separate frame for flexible placement.
This modular design simplifies installation and maintenance, as each unit can operate independently while ensuring reliable freshwater supply at sea.
To ensure longevity in marine environments, the pre-filtration housing and low-pressure pipes are crafted from corrosion-resistant UPVC. Meanwhile, high-pressure components are made from SUS316L stainless steel, prioritizing durability. Finally, the entire system’s compact design ensures it fits perfectly on ships or in other space-constrained locations.
Marine water maker information table
| HY-SWRO-1000L/hr (20m3/D) | |||
| Flow rate | 20000L/day | Recovery rate | 65% |
| Applicable power | 440V/60hz 3 phase | Rated power | 6.6-8KW |
| Feedwater TDS | ≤35000ppm | freshwater TDS | 300-500ppm |
| Working pressure | 60 bar | operating temperature | 5-45℃ |
| Feedwater residual chlorine | <0.1ppm | Feedwater SDI | <5 |
| Feedwater turbidity | <1NTU | Feedwater PH value | 3-10 NTU |
| RO membrane housing | 8040-1 core,2pieces | RO membrane | 2 pieces |
| Pre-filter size | 1.5×1.1×1(m) L*W*H | Net weight | / |
| RO part size | 1.5×1.1×1.85(m) L*W*H | Gross weight | / |
Process Flow：
Feed water pump → Sand filter → Anti-scalant dosing → Security filter → High pressure pump → RO system → Chemical cleaning device
| Component Name | Function Description |
| Feed Water Pump | Responsible for drawing seawater into the system, serving as the starting point of the entire process. |
| Sand Filter | Removes large particles (e.g., sediment, suspended solids) from seawater to protect downstream equipment from wear or blockage. |
| Anti-scalant Dosing Device | Adds chemical anti-scalants to seawater to prevent salt scaling on the reverse osmosis membrane surface, extending membrane life. |
| Security Filter | Further removes fine particles (e.g., impurities larger than 5 microns) from seawater to ensure clean water enters the reverse osmosis system. |
| High-Pressure Pump | Provides the necessary high pressure (typically 6-8 MPa) for the reverse osmosis system, enabling seawater to pass through the reverse osmosis membrane. |
| RO (Reverse Osmosis) System | Core component that removes salts, organic matter, and microorganisms from seawater through selective membrane permeability, producing freshwater. |
| Chemical Cleaning Device | Used for periodic cleaning of the reverse osmosis membrane to remove pollutants (e.g., scaling, organic deposits) and restore membrane flux, maintaining system performance. |
Marine Water Maker: Role & Function
– Produces Fresh Water：
Converts seawater into drinkable water for daily use (drinking, cooking, cleaning).
– Ensures Safe Water：
Removes salt and impurities to provide safe, potable water.
– Boosts Independence：
Reduces reliance on shore-based water supplies, enhancing self-sufficiency at sea.
Marine water maker introduction video
Why design and choose marine water maker?
It can use reverse osmosis technology to convert seawater into usable fresh water to meet daily living water needs;
the overall design is compact and flexible, easy to carry, install and disassemble.The space on board is limited.
A high-quality marine water maker can meet various needs, water production, size, easy to carry, and save space costs;
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–Not for use on board, we also have more products to treat various raw water.
click here: well / brackish water reverse osmosis system
–To watch more video introductions of our products, please click our YT link.
click here: https://www.youtube.com/@Haiyuanwater
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Marine water maker inquiry guides：
- Product water flow rate ( m3/hr, m3/day, Liter/hr,GPM,GPD etc.)
- Product water purpose(drinking, irrigation, industry process or others)
- Feed Water TDS (Total dissolved solids). Is it from Borehole/salt/brackish/lake water
- Power (110/220/380V/415V/460V, 50 or 60 Hz) 3 phase.
- It is necessary to make water analysis reprot for borehole water,lake water, seawater.
- If soure water is tap water no need end to us TDS or water analysis report.