Built, tested and ready to dispatch. Contact us to reserve it or to discuss configuration for your site.
A complete high-efficiency seawater reverse osmosis plant producing 50,000 gallons per day (200 m³/day) of potable water from seawater up to 40,000 ppm TDS. Energy recovery is by FEDCO HPB-20 hydraulic pressure booster, paired with a FEDCO MSS-2025 multi-stage Duplex stainless high-pressure pump — a combination built for continuous duty in marine and coastal service, with a 25+ year design life.
How the HPB turbocharger reduces power
Concentrate leaves the membranes at 788 psi, still carrying most of the energy the pump put into it. The HPB-20 is a turbocharger that captures that energy and uses it to boost the feed by 266 psi before the membranes. The high-pressure pump therefore only has to produce 543 psi rather than the 805 psi the membranes need, and the motor drops from about 75 HP to 50 HP. There is no mixing between the brine and feed streams, and transfer efficiency is greater than 83%.
| Parameter | Without energy recovery | With HPB-20 | Difference |
|---|---|---|---|
| Required pump discharge | 805 psi | 543 psi | 33% lower |
| Motor power required | ~75 HP | 50 HP | 25 HP saved |
| Specific energy | ~5.5 kWh/m³ | ~3.5 kWh/m³ | 36% reduction |
Key components
1FEDCO MSS-2025 high-pressure pump
25-stage horizontal multi-stage centrifugal, barrel flanged joint. 87 GPM at 543 psi discharge, 3,551 rpm, 64.7% efficiency, 41.3 HP absorbed, NPSHR 15 ft. Duplex SS 2205 shell and shaft, 316L passivated and electropolished impellers and diffusers, SiC/graphite mechanical seal faces, 3" Victaulic Style 77 grooved connections. 194 lb. MSS-20 frame pictured — see the MSS range.
1FEDCO HPB-20 energy recovery
Hydraulic pressure booster (turbocharger), zero brine/feed mixing. 87 GPM feed, 52 GPM brine, 266 psi feed boost, >83% transfer efficiency. Super Duplex SS 2507 casing, rotor and valve stem; non-metallic product-lubricated bearings with no user maintenance. Integral variable-area auxiliary nozzle for brine flow control. 16 lb, 6.3 × 5.5 × 9.1 in. Product page.
16LG NanoH2O SW 8040 membranes
Nano-composite thin-film, low energy and high rejection. 8" × 40" elements, ~400 ft² active area each, 99.85% salt rejection, 1,000 psi maximum operating pressure, ~3,125 GPD per element derated. Arranged four per vessel. Product page.
4Pentair Codeline 80S100-4 vessels
8" diameter FRP pressure vessels, four elements each, side-port, rated 1,000 psi. Piedmont Style D Super Duplex fittings rated 1,200 psi. Product page.
1WEG W22 motor
50 HP, NEMA 364TSC frame, 380/460 V 3-phase 50/60 Hz dual rated, 3,600 rpm, TEFC IP55, 56.1 A at 460 V, 93% efficiency. Shaft grounding ring and thermostats fitted. 628 lb. Shown close-coupled to the pump in the system rendering.
1Automation Direct DURApulse VFD
50 HP, 380–480 VAC 3-phase. Soft start, speed control, motor protection and fault diagnostics. Housed in the skid-mounted control cabinet, shown in the system rendering.
Technical specifications
| Design parameters | |
| Permeate production | 50,000 GPD (200 m³/day) |
|---|---|
| Design feed water TDS | 36,000 ppm |
| Maximum feed water TDS | 40,000 ppm |
| Product water quality | < 500 ppm TDS |
| Salt rejection | > 99.5% (system); 99.85% membrane rating |
| Recovery rate | 40% |
| Feed water flow | 87 GPM |
| Concentrate flow | 52.2 GPM |
| Required feed pressure | 70 psi |
| Operating pressure at 36,000 ppm | 805 psi |
| Maximum working pressure | 1,000 psi |
| Feed water temperature | 10–27 °C (design 25 °C) |
| Design SDI after pre-treatment | < 3 |
| Design pH range | 6.5–8.5 |
| Free chlorine at membranes | 0.0 ppm — SMBS dechlorination required |
| Specific energy consumption | ~3.5 kWh/m³ |
| Total connected power | 50 HP (37 kW) |
| Power supply | 380/460 V, 3-phase, 50/60 Hz |
| Operating hours | 24 hours/day |
| Design life | 25+ years |
Pre-treatment, chemical dosing and materials
| Pre-treatment | |
| Multi-media filters | 2 × 30" D × 72" H fiberglass composite, automatic backwash, filtration to ~20 micron |
|---|---|
| Cartridge filter | 1 × fiberglass housing, 5 micron nominal, rated 150 GPM |
| Feed booster pump | Grundfos or equivalent, 316 SS, 50–60 psi delivery (optional, site dependent) |
| Chemical dosing | |
| Sodium hypochlorite | Biocide and bio-fouling control, dosed before the multi-media filters |
| Sodium metabisulfite | Dechlorination, after the multi-media filters and before the cartridge filter |
| Antiscalant | KingLee Pretreat Plus 0100 at 3–5 ppm, after the cartridge filter |
| Sodium hydroxide | Product water pH adjustment, permeate line |
| CIP chemicals | Acid (HCl / H₂SO₄) and alkaline cleaner for membrane cleaning |
| Piping materials | |
| High pressure | Duplex SS 2205, welded and grooved, rated 1,000 psi |
| Energy recovery | Duplex SS 2205 / Super Duplex 2507 with Piedmont 1,200 psi couplings |
| Low pressure and CIP | Schedule 80 PVC, 150 psi rated |
Instrumentation and controls
| Instrumentation | |
| TDS monitoring | Myron II-HL digital panel-mount controller on feed and product water |
|---|---|
| Flow metering | Panel-mount analog meters on feed, permeate and concentrate |
| Pressure gauges | Liquid-filled 316 SS — 0–300 psi feed, 0–1,500 psi working and concentrate |
| Pressure switches | ProSense MPS25 316 SS — low pressure 6–30 psig, high pressure 200–2,000 psig |
| Control system | |
| PLC | Allen-Bradley, full automation |
| Start permissives | Power on, start pressed, low-pressure switch closed, product tank below high level |
| Automatic shutdown | High working pressure, low inlet pressure (< 20 psi), starter overload trip, product tank high level, emergency stop |
| Cleaning | Built-in CIP system — no external cleaning skid required |
Containerisation (optional)
The skid fits a standard 40 ft High Cube ISO container, which can be supplied fully insulated and air conditioned, with high-security double swing-out doors plus a side door, LED interior lighting, 3/4" plywood flooring on 16" centres, and rust-inhibitive paint with ForeverPure livery. The container is pre-wired for single-point power connection and pre-plumbed for feed, permeate and concentrate, and is fully assembled and factory tested before shipping.
What a containerised ForeverPure SWRO-HPB plant looks like
The unit filmed here is a SWRO-HPB-250TPD — 250 m³/day, about 66,000 GPD. It is a larger machine from the same HPB family, not the 200 m³/day system on this page. It is shown because the container fit-out is the same one described above: double swing-out doors plus a side door, LED interior lighting, plywood flooring, and the plant pre-plumbed and pre-wired inside before it ships.
Warranty
FEDCO MSS-2025 high-pressure pump: 18 months from ship date. FEDCO HPB-20 energy recovery device: 36 months from ship date. LG NanoH2O membranes carry LG's prorated element warranty, typically 3–5 years subject to their terms. Warranty on all items is the manufacturer's and is subject to correct installation, operation within the stated design envelope, and the pre-treatment and chemical dosing regime described above.
Compare seawater desalination system capacities
All Seawater Desalination Systems (200 GPD to 1,000,000 GPD) · Desalination Machine Buyer’s Guide · 132,000 GPD Seawater Desalination Plant · 264,000 GPD Seawater Desalination Plant · 530,000 GPD High-Efficiency SWRO Plant
Frequently asked questions
How much water does a 50,000 GPD plant serve?
50,000 GPD is 200 m³/day, roughly 2.2 L/sec of continuous production. That typically covers a resort, a small island community, an offshore or coastal facility, or an industrial process water demand of that order.
What does the FEDCO HPB-20 actually do?
It is a hydraulic pressure booster — a turbocharger driven by the concentrate stream leaving the membranes. It recovers that energy and boosts the feed by 266 psi, so the high-pressure pump only has to deliver 543 psi instead of the 805 psi the membranes need. Transfer efficiency is greater than 83%, and there is no mixing of brine and feed. Bearings are non-metallic and product-lubricated, so there is no scheduled overhaul, no lubrication and no oil change.
Why Duplex and Super Duplex stainless steel?
Seawater at 36,000 ppm TDS is aggressively corrosive under pressure. The MSS-2025 pump shell and shaft are Duplex SS 2205 and the HPB-20 casing, rotor and valve stem are Super Duplex SS 2507, which is what supports the 25+ year design life in a marine environment. High-pressure piping is Duplex 2205 with Piedmont Super Duplex couplings rated to 1,200 psi.
Will it run on 50 Hz or 60 Hz power?
Both. The WEG W22 motor is dual rated 380/460 V, 3-phase, 50/60 Hz, so the system runs on either global supply without a transformer. A 50 HP Automation Direct DURApulse VFD provides soft start and speed control.
Is the system containerised?
Containerisation is optional. The skid is designed to fit inside a standard 40 ft High Cube ISO container, which can be supplied insulated and climate controlled, pre-wired for single-point power and pre-plumbed for feed, permeate and concentrate connections, and factory tested before shipping.
How do I get a price?
This system is quoted to your site conditions — feed water analysis, temperature, power supply and whether you need containerisation all change the configuration. Email sales@foreverpureplace.com or call 408-969-2688 and we will prepare a techno-commercial proposal.
