Seawater Pretreatment RO System

Integrating heavy-duty physical filtration, ultrafiltration, and high-pressure desalination into a single modular skid, this system reduces high-salinity feed water Silt Density Index below 3 to consistently deliver low-TDS permeate while protecting downstream polyamide membranes from premature scaling and bio-fouling in aggressive coastal environments.

Multi-Stage Filtration: Combines dual-media disc filters, automatic backwashing pressure vessels, and hollow-fiber ultrafiltration to eliminate suspended solids and colloids.

High-Pressure Metallurgy: Utilizes Super Duplex Stainless Steel (UNS S32750 / 254SMO) for pump casings, valve manifolds, and membrane adapters to prevent chloride corrosion.

Energy Recovery Integration: Employs isobaric energy recovery devices or turbochargers to transfer hydraulic energy from high-pressure reject brine to incoming feed water.

Precision Chemical Dosing: PLC-controlled skids maintain exact ppm injection ratios relative to real-time flow meters to prevent mineral scale formation.

Municipal Desalination: Supplying stable drinking water infrastructure for coastal cities and remote islands.

Industrial Process Water: Providing boiler makeup and cooling tower feed water for coastal power plants and refineries.

Marine & Offshore: Delivering freshwater on floating production storage vessels, drilling rigs, and cargo ships.

Resort Infrastructure: Supporting independent freshwater networks for remote coastal hospitality developments.

Intake & Screening: Self-cleaning screen filters remove macro-debris and particles larger than 200 microns.

Filtration & Coagulation: Coagulant dosing aggregates fine colloids prior to multi-layer anthracite and garnet pressure filters.

Ultrafiltration Barrier: Hollow-fiber ultrafiltration modules operate in automated backwash loops to guarantee a constant filtrate SDI under 3.
 

High-Pressure Desalinating: Booster pumps feed pretreated water into positive displacement pumps, forcing pure water through SWRO composite membranes.

Structural Base: Heavy-gauge carbon steel skids finished with marine-grade epoxy coating, complete with lifting lugs and anchor plates.

Pumping Infrastructure: Vertical multistage centrifugal feed pumps and high-pressure axial piston pumps coupled with IE3 motors.

Instrumentation Suite: Siemens S7 PLC control panels paired with industrial HMI touchscreens, conductivity meters, pH sensors, and magnetic flow meters.

Valves & Piping: Pneumatically actuated butterfly valves and manual high-pressure ball valves constructed from PVC, 316L, or Super Duplex.

Feed Water Analysis: Submit complete water chemistry reports covering total dissolved solids, temperature fluctuations, and silica.

Capacity Sizing: Determine daily volumetric demand factoring in peak hours, Clean-In-Place downtime, and future plant expansions.

Footprint Verification: Measure available containerized or indoor installation space, verifying overhead clearance for membrane extraction.

Power Supply Matching: Confirm local electrical grid specifications, voltage, frequency, and phase configuration for main drive motor starters.

Containerized Enclosures: Built inside standard 20-foot or 40-foot ISO marine containers, fully insulated, climate-controlled, and equipped with safety eyewash stations.

Alloy Upgrades: Substitution of standard 316L wetted parts with 254SMO, Titanium, or Super Duplex UNS S32750 for extreme salinity.

Energy Recovery Selection: Tailored integration of pressure exchanger rotary devices, turbochargers, or Pelton wheels based on plant scale.

Redundancy Packages: Dual-train standby pump configurations and automated backwash manifolds for unstaffed 24/7 operation.

Hydrostatic Testing: High-pressure piping circuits and membrane vessels undergo factory pressure testing at 1.5 times working pressure prior to dispatch.

Welding Inspection: Structural and stainless steel piping welds undergo non-destructive examination, including radiographic or dye penetrant testing.

Factory Acceptance Testing: Control panels undergo rigorous I/O simulation, PLC logic verification, and dry-run pump interlocking tests.

Material Traceability: Mill test certificates are provided for all pressure-containing metallic components, flanges, vessels, and valves.

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