High-Pressure SWRO Pumps
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High-Pressure SWRO Seawater Desalination PumpsContinuous Duty | Duplex & Super Duplex Construction | Energy-Efficient RO Feed Engineered specifically for Seawater Reverse Osmosis (SWRO) and brackish water desalination systems, the FILIPUSI high-pressure vertical multistage pump delivers stable 80+ bar feed pressure with exceptional energy efficiency. Built with Super Duplex 2507 and Duplex 2205 wetted components, these pumps resist severe chloride pitting and crevice corrosion under continuous high-salinity, high-pressure operation. With flows from 1 to 1,200 m³/h and pressures up to 80 bar, the SWRO series is the preferred choice for desalination plants, shipboard freshwater production, island water supply, and industrial ultrapure water systems worldwide.
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⚓ Class Compliance Available: ABS | BV | CCS | DNV | GL Standards | Full Material Test Reports Provided
Key Desalination & RO System Advantages
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Superior Anti-Corrosion SS316L, Duplex 2205 & Super Duplex 2507 wetted components resist high-chloride pitting and crevice attack under continuous 80+ bar seawater service. PREN values up to 42-45 for extreme corrosion resistance. |
High Hydraulic Efficiency CFD-optimized fluid channels and precision-cast impellers deliver maximum pressure with minimal specific power consumption, reducing energy costs — typically the largest operating expense in SWRO plants. |
Continuous 80+ Bar Duty Engineered for stable high-flux membrane separation in SWRO continuous operations. Stage-by-stage pressure accumulation delivers smooth, low-vibration high-pressure output without pulsation. |
Engineered Structural Integrity for SWRO Membranes
Driven by electric motors at standard industrial speeds (2900 rpm at 50Hz / 3500 rpm at 60Hz), the pump shaft spins multiple series-connected impellers to incrementally boost seawater pressure from suction to 80+ bar discharge. Each stage adds controlled pressure, ensuring smooth, pulsation-free feed to RO membrane arrays. The vertical inline design aligns suction and discharge flanges on the same centerline, allowing direct pipeline mounting and simplifying skid assembly in desalination plants.
| • | Heavy-Duty Wetted Alloys: Precision-machined 316L, Duplex 2205, or Super Duplex 2507 components resist fluid erosion, chloride pitting, and crevice corrosion in high-salinity seawater. |
| • | High-Pressure SiC Seals: Silicon carbide (SiC/SiC) mechanical seals with Viton or EPDM elastomers designed for continuous high-bar, high-salinity marine duty. Double seal configurations available for hazardous service. |
| • | Low-NPSH Hydraulics: Optimized impeller inlet geometry prevents cavitation under varying suction heads, critical for stable operation when paired with energy recovery devices (ERD) in SWRO systems. |
| • | Axial Thrust Balance System: Hydraulic balance disc or drum neutralizes up to 95% of cumulative axial thrust, extending bearing and mechanical seal service life in high-pressure multi-stage operation. |
| • | Compact Vertical Footprint: Space-saving inline configuration simplifies skid assembly and field maintenance. Up to 50% smaller footprint than horizontal high-pressure pump configurations. |
| • | VFD & PLC Integration: Seamlessly compatible with variable frequency drives and automated sensors for real-time feed pressure adjustment, optimizing permeate flux and reducing energy consumption. |
Performance & Hydraulic Curves
Representative Performance Curves: Sample reference charts below. FILIPUSI offers complete hydraulic coverage from 1 to 1,200 m³/h up to 80+ bar (50Hz / 60Hz). Contact our application engineers for model-specific curves tailored to your required duty point.
Need Duty Point Sizing or Full Curve Books? Our application engineers can simulate exact hydraulic curves tailored to your required Flow (Q), Head (H), and Salinity (TDS). Request full hydraulic selection chart »
General Technical Parameters
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Engineering Specification
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Standard Rating Range
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Custom Options (OEM / ODM)
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Volumetric Flow Rate (Q)
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1 – 1,200 m³/h
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Customized flow paths for specific membrane array configurations
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Operating Pressure (P)
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Up to 80 bar (8.0 MPa)
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Ultra-high pressure configurations up to 120 bar for high-recovery SWRO
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Motor Power Range
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1.5 kW – 400 kW
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IE2/IE3/IE4 premium efficiency, explosion-proof (ExdIIBT4) for hazardous zones
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Inlet / Outlet Size
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DN25 – DN200
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DIN / ANSI / JIS flange standards, PN40/PN63 high-pressure ratings
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Number of Stages
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2 – 64 stages
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Custom stage counts for exact duty point matching at Best Efficiency Point (BEP)
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Liquid Temperature
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-15°C to +120°C
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High-temp mechanical seals with cooling jackets for thermal processes up to +180°C
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Material Metallurgy
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SS304 / SS316L (standard)
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Duplex 2205 / Super Duplex 2507 / Nickel-Aluminum Bronze / Hastelloy options
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Mechanical Seal
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Cartridge type, SiC/SiC faces (standard)
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Double mechanical seals, Plan 11/21/32 flush plans, API 682 compliant configurations
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Pressure Rating (Casing)
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PN16 / PN25 (standard)
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PN40 / PN63 / PN100 high-pressure outer cylinder for SWRO service
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Electrical Drive
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380V / 50Hz, 3-phase (Standard IP55 IE3)
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220V / 415V / 440V / 460V, 60Hz, VFD-ready, marine-duty IP56 Class F/H
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Max. Feed Water TDS
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Up to 45,000 mg/L (seawater)
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High-salinity brine configurations up to 70,000 mg/L with Super Duplex 2507
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Certifications
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CE, ISO 9001:2015
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ABS / BV / CCS / DNV / GL marine classification on request
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Cross-Sectional Structure & Component Key
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Component
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Standard Material
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Engineering Feature
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1. Pump Shaft
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Duplex 2205 / 316L SS
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Precision ground to minimize radial vibration and extend seal life.
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2. Impellers
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Ni-Al Bronze / Duplex SS
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Closed design dynamically balanced to ISO 1940 G6.3 for smooth high-speed operation.
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3. Diffusers
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316L SS / Duplex 2205
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Smooth hydraulic channels reduce internal turbulence and maximize stage efficiency.
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4. Shaft Sealing
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SiC / SiC / Viton
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Balanced cartridge seal designed for continuous high-bar, high-salinity duty.
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5. Thrust Disc
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Hardened SS
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Hydraulically neutralizes axial thrust to extend bearing and seal service life.
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6. Outer Cylinder
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High-Tensile SS 304/316
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Reinforced casing engineered up to PN63 / PN100 pressure for SWRO service.
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7. Flanges
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Cast Iron / SS
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Inline layout, DIN / ANSI / JIS marine compliant for direct pipeline mounting.
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Material Selection Guide for Desalination Service
| Material Grade | PREN Value | Recommended Application | Corrosion Resistance & Key Properties |
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| SS316L | PREN 24-28 | Brackish water RO, low-salinity feed, industrial ultrapure water | Good general corrosion resistance. Low carbon content prevents intergranular corrosion. Not recommended for continuous seawater service above 35°C. |
| Duplex 2205 | PREN 35-40 | Standard seawater RO, BWRO systems, moderate-temperature SWRO | Higher strength and corrosion resistance than 316L. Resists chloride pitting and stress corrosion cracking. Industry standard for most SWRO plants. |
| Super Duplex 2507 | PREN 42-45 | High-temperature SWRO, high-salinity brine, tropical seawater, extreme recovery systems | Premium corrosion resistance. Withstands extreme salinity, elevated temperatures, and high-pressure continuous duty. Recommended for tropical and Red Sea applications. |
| Nickel-Aluminum Bronze (C95800) | PREN 30-35 | Shipboard SWRO, marine desalination, low-pressure seawater intake | Excellent resistance to cavitation erosion and marine biofouling. High impact strength. Preferred for shipboard and offshore applications. |
Key Applications & Industry Use Cases
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Municipal Seawater Desalination Plants Large-scale SWRO plants producing 10,000 to 500,000 m³/day of freshwater for coastal cities and municipalities. FILIPUSI high-pressure pumps deliver stable 55-70 bar feed pressure to membrane arrays, with VFD control optimizing energy consumption across varying demand cycles. Duplex 2205 construction provides reliable service in standard seawater conditions. |
Brackish Water Reverse Osmosis (BWRO) Groundwater and well water desalination with TDS ranging from 1,000 to 15,000 mg/L. Lower operating pressures (15-40 bar) allow use of SS316L construction, reducing capital cost while maintaining corrosion resistance. Ideal for inland communities, agriculture, and industrial process water treatment. |
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Shipboard & Offshore SWRO Systems Compact freshwater production aboard commercial vessels, cruise ships, naval vessels, and offshore platforms. The vertical inline design saves valuable engine room space, while marine-duty motors (IP56, Class F/H) and Nickel-Aluminum Bronze construction withstand vessel vibration and continuous seawater exposure. Classification society documentation available. |
Island & Resort Water Supply Standalone desalination systems for island communities, resorts, and remote coastal facilities where freshwater infrastructure is limited. Skid-mounted configurations simplify installation and maintenance. Super Duplex 2507 construction recommended for tropical and high-salinity seawater conditions. |
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Industrial Ultrapure Water & Semiconductor High-purity water production for semiconductor manufacturing, pharmaceutical production, power plant boiler feed, and food & beverage processing. SS316L or Duplex construction with electropolished wetted surfaces prevents contamination. Double mechanical seals with API flush plans ensure zero leakage in critical applications. |
High-Pressure Washdown & Industrial Cleaning Industrial high-pressure cleaning systems, ship hull washdown, and food processing CIP (Clean-in-Place) systems. The multistage design delivers consistent high pressure without pulsation, ensuring effective cleaning. VFD control allows pressure adjustment for different cleaning requirements. |
How to Select the Right SWRO Pump Model
With over 100 standard configurations available, selecting the correct high-pressure desalination pump requires matching five core parameters to your system requirements:
| 01 | Required Flow Rate (Q): Determine the permeate production capacity and recovery rate of your RO system. The feed flow rate = permeate flow ÷ recovery rate. The FILIPUSI SWRO series covers 1 to 1,200 m³/h. Select a pump that operates at 80-110% of its Best Efficiency Point (BEP) at design flow. |
| 02 | Required Operating Pressure: Calculate the feed pressure required by your membrane manufacturer. Typical SWRO operating pressures range from 55-70 bar for standard seawater (TDS ~35,000 mg/L) to 70-80 bar for high-salinity or high-recovery systems. BWRO systems typically require 15-40 bar. |
| 03 | Feed Water Salinity (TDS) & Material: Standard seawater (TDS 30,000-40,000 mg/L) = Duplex 2205. High-salinity or tropical seawater (TDS >40,000 mg/L, temp >30°C) = Super Duplex 2507. Brackish water (TDS <15,000 mg/L) = SS316L. Always specify TDS and water temperature at order time. |
| 04 | Energy Recovery Device (ERD) Compatibility: If your system uses an energy recovery device (PX Pressure Exchanger, turbocharger, or work exchanger), confirm the pump must handle reduced flow (feed flow minus brine flow). The pump outlet pressure must match ERD inlet pressure requirements. Our engineers can size pumps for all ERD configurations. |
| 05 | Electrical & Automation Requirements: Confirm plant voltage and frequency (380V/50Hz, 440V/60Hz, etc.). All SWRO pumps are VFD-compatible for precise pressure control. Specify PLC communication protocol (Modbus, Profibus, Ethernet/IP) for integration into plant SCADA systems. For hazardous areas, specify explosion-proof motors. |
Need help selecting? FILIPUSI desalination engineers provide free pump selection services. Send us your required flow, operating pressure, feed water TDS, recovery rate, and electrical specifications, and we will recommend the optimal SWRO pump model with a full performance curve and dimensional drawing within 24 hours.
Quality Control & Testing Procedures
Every FILIPUSI high-pressure desalination pump undergoes rigorous quality control and testing before shipment to ensure reliable performance in demanding SWRO environments:
| • | 100% Hydrostatic Pressure Testing: All pressure-containing components (outer cylinder, pump head, flanges) are hydrostatically tested at 1.5x maximum working pressure for a minimum of 15 minutes, with zero leakage acceptable. |
| • | Performance Verification Testing: Each pump is performance-tested on our in-house high-pressure test bench to verify flow rate, head, efficiency, and NPSHr against the published performance curve. Test reports available upon request. |
| • | Material Traceability: All wetted components come with material test reports (MTR 3.1) verifying chemical composition and mechanical properties. Full traceability from casting to finished pump is maintained. |
| • | Dynamic Shaft Balancing: All rotating assemblies (shaft, impellers, thrust disc) are dynamically balanced to ISO 1940 G2.5 grade to minimize vibration and extend bearing and seal life in high-speed operation. |
| • | Mechanical Seal Pressure Test: Assembled mechanical seals are pressure-tested at operating pressure to verify zero leakage before final assembly. Double seals are tested with barrier fluid circulation. |
| • | Third-Party Inspection: Classification society surveyor inspection (ABS, BV, CCS, DNV, etc.) available upon request, with full documentation package including material certificates, test reports, and inspection records. |
Desalination Pump Procurement FAQ
Q1: Why is Duplex or Super Duplex steel recommended for SWRO?
A1: Super Duplex 2507 (PREN 42-45) and Duplex 2205 (PREN 35-40) offer high pitting resistance equivalent numbers to resist severe chloride pitting and crevice corrosion under continuous 80+ bar operation. Standard SS316L (PREN 24-28) is susceptible to pitting in seawater above 35°C, making it unsuitable for most SWRO applications. The higher alloy content of Duplex steels ensures 15-20 year service life in desalination plants.
Q2: Can FILIPUSI multistage pumps integrate with PLC/VFD automation?
A2: Yes. All high-pressure desalination pumps integrate seamlessly with VFD controllers and automated sensors for real-time feed pressure adjustment. Standard Modbus RTU/TCP, Profibus, and Ethernet/IP communication protocols enable integration into plant SCADA and DCS systems. VFD control typically reduces energy consumption by 20-40% compared to fixed-speed operation with throttle valves.
Q3: What applications fit this multistage series?
A3: SWRO plants, BWRO systems, industrial ultrapure water filtration, marine boiler feed, high-pressure washdown systems, island water supply, shipboard freshwater production, semiconductor manufacturing water treatment, and food & beverage process water. The series covers flows from 1 to 1,200 m³/h and pressures up to 80 bar, making it suitable for both small skid-mounted systems and large municipal desalination plants.
Q4: What is the typical lead time for high-pressure desalination pumps?
A4: Standard configuration pumps with SS316L construction typically have a lead time of 20-30 working days. Pumps with Duplex 2205 or Super Duplex 2507 construction require 35-50 working days due to longer casting and machining times. Pumps requiring classification society third-party inspection add 7-14 working days for surveyor scheduling and documentation. Custom material configurations (Hastelloy, etc.) may require 60-90 days. Rush orders can be accommodated on a case-by-case basis.
Q5: How do I select the correct pump size for my SWRO plant?
A5: Selecting the correct pump size requires four key parameters: (1) Feed flow rate = permeate production ÷ system recovery rate; (2) Operating pressure specified by membrane manufacturer (typically 55-70 bar for SWRO); (3) Feed water TDS and temperature to determine material selection; (4) Whether an energy recovery device is used (reduces required pump flow). We recommend selecting a pump that operates at 80-110% of BEP at design flow. Send us your system parameters and our engineers will provide a detailed selection within 24 hours.
Q6: Do you provide spare parts and after-sales technical support?
A6: Yes. FILIPUSI provides comprehensive after-sales support for all desalination pump models. We maintain an inventory of OEM spare parts including mechanical seal cartridges, bearing sets, impellers, diffusers, wear rings, shaft sleeves, O-rings, and gaskets. Spare part kits can be shipped within 5-7 working days for standard models. Our engineering team provides remote technical support via email, WhatsApp, and video call for installation guidance, troubleshooting, and maintenance advice. For large plant operators, we offer customized spare part packages and annual maintenance contracts.
Q7: Can you provide custom materials for extreme salinity applications?
A7: Yes. For extreme salinity applications (Red Sea, Persian Gulf, high-recovery brine systems with TDS >50,000 mg/L), we offer Super Duplex 2507 as standard, and can provide custom materials including 254 SMO, AL-6XN, Hastelloy C-276, and Titanium Grade 2 for the most demanding applications. All custom material pumps come with full material test reports and can be third-party inspected. Contact our engineering team to discuss your specific water chemistry requirements.
Q8: What is the recommended maintenance schedule for SWRO high-pressure pumps?
A8: For normal SWRO service: inspect for leaks and unusual noise monthly; check motor bearing temperature and vibration every 3 months; replace mechanical seal every 8,000-12,000 hours (or annually for continuous 24/7 operation); inspect impellers, diffusers, and wear rings for corrosion or erosion every 18,000-24,000 hours; replace thrust disc/bearings every 3-5 years. For high-salinity or high-temperature service, reduce all intervals by 50%. FILIPUSI supplies OEM spare part kits for all SWRO models.
Optimize Your SWRO & RO Pumping System Today
Get direct factory support—from custom hydraulic sizing to Duplex alloy selection for global RO projects. FILIPUSI delivers tailored OEM/ODM manufacturing, precise hydraulic selection, specialized corrosion-resistant materials, and complete skid-mounted high-pressure pump packages for desalination plants worldwide.
Industrial Water Pump Manufacturer & Exporter | www.filipusi.com
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