Coastal Seawater RO System

Engineered for severe marine environments, the Coastal Seawater RO System converts open-ocean feed with total dissolved solids up to 45,000 mg/L into high-purity potable or process water through an integrated skid assembly combining pretreatment, chemical dosing, membrane separation, and energy recovery.

Corrosion-Resistant Metallurgy: High-pressure fluid pathways use Super Duplex Stainless Steel (UNS S32750) and nickel-aluminum-bronze alloys to resist aggressive chloride pitting.

Membrane Selectivity: Low-energy seawater elements deliver sodium chloride and boron rejection rates of 99.7% or higher.

Energy Minimization: Isobaric pressure exchangers recycle hydraulic energy from reject brine, reducing total plant energy consumption by up to 40%.

Chemical Dosing Precision: Multi-channel microprocessor controls automatically regulate antiscalant injection and dechlorination to protect elements.

Island Municipalities: Decentralized drinking water networks for remote island communities.

Coastal Resorts: Independent potable water production for beachside hotels and residential complexes.

Marine Facilities: Shore-to-ship water bunkering, commercial ports, and naval logistics bases.

Industrial Operations: Process makeup water for coastal power plants, refineries, and large-scale aquaculture.

Pretreatment: Seawater passes through disc filters, sand filters, and ultrafiltration modules to reduce silt density index below 3 and turbidity under 1.0 NTU.

High-Pressure Pumping: Multistage centrifugal or positive displacement pumps boost pretreated water to operating pressures between 5.5 MPa and 7.0 MPa.

Membrane Separation: Pressurized feed enters spiral-wound modules; pure water permeates through polyamide layers while concentrated brine is rejected.

Energy Recovery: Reject brine passes through the energy recovery unit to transfer pressure before discharge, followed by degasification and remineralization.

Skid Structure: Carbon steel structural frame blasted to Sa 2.5, coated with marine-grade epoxy primer and polyurethane finish.

Piping Architecture: Low-pressure lines use Schedule 80 UPVC/CPVC; high-pressure lines use seamless Super Duplex Stainless Steel with orbital TIG welding.

Control System: Siemens PLC linked to an HMI touch panel; inline sensors continuously monitor conductivity, pH, flow rate, and pressure.

Valve Assemblies: Pneumatic butterfly and manual ball valves feature PTFE seats and CF8M stainless steel bodies.

Feed Water Limits: Turbidity < 1.0 NTU, SDI < 3.0, Free Chlorine < 0.1 mg/L, Oil/Grease < 0.5 mg/L, Temperature 10°C–35°C, pH 6.5–8.0.

Product Water Quality: TDS < 500 mg/L (WHO drinking water compliant), Chloride < 250 mg/L, Boron < 0.5 mg/L, SDI < 2.0, Pathogen reduction > 99.9%.

Water Analysis Evaluation: Verify raw water parameters, seasonal temperature shifts, and salinity peaks before sizing motors.

Capacity Margin Calculation: Factor in a 15% flux decline allowance over a 3-year lifespan to determine daily output requirements.

Power Availability: Confirm 3-phase industrial power capacity and evaluate energy recovery integration needs.

Footprint Allocation: Provide a corrosion-resistant, ventilated enclosure with clearance for membrane element extraction.
 

Containerized Enclosures: Systems housed in ISO 20-foot or 40-foot high-cube containers with internal climate control and lighting.

Material Upgrades: Wetted components upgradeable to Titanium (Grade 2) or Nickel Alloy 625 for extreme hypersaline conditions.

Dual-Pass Configuration: Secondary pass RO trains integrated for high-purity industrial boiler feed or strict pharmaceutical standards.

Solar Hybrid Integration: DC-AC photovoltaic power management paired with battery storage for off-grid operation.

Hydrostatic Testing: High-pressure stainless steel piping tested at 1.5 times maximum design working pressure.

Electrical Safety Inspection: Control panels wired and tested to IEC 60204-1 standards, verifying insulation and ground continuity.

Factory Acceptance Testing (FAT): Modular skids undergo functional dry-run testing of instrumentation, valve sequencing, and PLC logic.

Material Traceability: Mill test certificates supplied for pressure vessels, membranes, pumps, and alloy piping components.

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