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FilmTec SW30-4040 – Seawater Desalination Membrane
₺49,864.40
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- SKU
- WP-MB-018
- Category
- RO Membranes, Water Filters, Water Treatment Spare Parts, Reverse Osmosis Systems
FilmTec · Seawater RO · 4040
99.7% Salt Rejection in Seawater Treatment with the FilmTec SW30-4040
The FilmTec SW30-4040 is a 4040-size membrane element of polyamide thin-film composite construction, made for commercial seawater reverse osmosis systems. According to the DuPont product data sheet it delivers 1,950 gallons (7.4 m³) of product water per day at 800 psi (55 bar); stabilised salt rejection is 99.7% and minimum salt rejection 99.5%. With a length of 1,016 mm and a diameter of 99 mm it fits a nominal 4 inch pressure vessel.
- Daily Output
- 7.4 m³
- Salt Rejection
- 99.7%
- Test Pressure
- 55 Bar
01Problem & Solution
Seawater Demands High Pressure
Problem
A Mains Water Membrane Falls Short on Seawater
The dissolved salt load of seawater is far above the range that mains and brackish water membranes are designed for. Treating this water by reverse osmosis requires a high feed pressure; elements made for low pressure reach their limits under these conditions, both in salt rejection and in pressure resistance.
Solution
An Element Made for Seawater
The FilmTec SW30-4040 is defined by a stabilised salt rejection of 99.7% in a 32,000 ppm NaCl test solution and withstands operating pressures of up to 83 bar. With its standard size, which fits a nominal 4 inch pressure vessel, it is used in commercial seawater treatment systems.
02Key Features
Output, Salt Rejection and Pressure Resistance
The FilmTec SW30-4040 brings together output, salt rejection and pressure resistance in a single element for seawater reverse osmosis applications.
99.7% Stabilised Salt Rejection
In a 32,000 ppm NaCl test solution the stabilised value is 99.7% and the minimum value 99.5%.
7.4 m³ Output per Day
1,950 GPD at a test pressure of 800 psi (55 bar); the output of a single element may vary by ±20%.
83 Bar Operating Limit
The maximum operating pressure is given as 1,200 psi (83 bar).
Lower-Pressure Option
The manufacturer states that SW30 elements can also be run at lower pressure to reduce the size of the pump.
Offshore and Onshore
SW30 elements are suitable for seawater treatment systems installed both offshore and onshore.
Standard 4040 Size
With a length of 1,016 mm, a diameter of 99 mm and a 19 mm product water tube, it fits a nominal 4 inch pressure vessel.
03Technical Specifications
Membrane Specifications
| Feature | Value | What it does |
|---|---|---|
| Brand | FilmTec (DuPont) | The manufacturer. The valve and membrane brand decides how easily spares can be found. |
| Model | SW30-4040 | The manufacturer’s model code. Spares and service are matched by this code. |
| Product Type | Seawater RO Membrane Element | The product family it belongs to. When buying a spare, the family alone is not enough; the size and model must match too. |
| Membrane Type | Polyamide Thin-Film Composite | The structure of the membrane. Chlorine burns it, so a carbon filter in front is essential. |
| Daily Output | 1,950 GPD (7.4 m³) | How much treated water it produces in a day. |
| Test Pressure | 800 psi (55 bar) | |
| Salt Rejection | 99.7% (Minimum 99.5%) | How much of the dissolved salt is rejected. A higher figure means purer water. |
| Test Water | 32,000 ppm NaCl | |
| Test Conditions | 25 °C · 8% Recovery | |
| Maximum Feed Flow Rate | 3.6 m³/hour (16 gpm) | |
| Size | 1,016 × 99 mm (40.0" × 3.9") | The physical size. If a spare does not match this, it will not go into the housing. |
| Product Water Tube | 19 mm (0.75") | |
| Compatibility | Nominal 4" Pressure Vessel | Which units and housings it works with. Compare it with yours before ordering. |
| Maximum Operating Pressure | 83 bar (1,200 psi) | |
| Maximum Pressure Drop | Element 1.0 bar · Vessel 3.4 bar | |
| Maximum Temperature | 45 °C | |
| pH (Continuous) | 2 – 11 | |
| pH (Short-Term Cleaning) | 1 – 13 | |
| Maximum SDI | 5 | |
| Free Chlorine | < 0.1 ppm |
04Applications
Where Is It Used?
The FilmTec SW30-4040 is used in seawater reverse osmosis systems with nominal 4 inch pressure vessels, in both offshore and onshore installations.
Seawater Treatment SystemsCoastal FacilitiesHotels and Holiday ResortsBoats and Offshore PlatformsIsland SettlementsOnshore Desalination Units4 Inch Pressure Vessel SystemsMembrane Renewal
05How It Works
How Does the FilmTec SW30-4040 Work?
FilmTec is DuPont’s reverse osmosis membrane brand; series and brand information is available on DuPont’s FilmTec page. The SW30-4040 also works on the principle of reverse osmosis: water is passed through a semi-permeable membrane at a feed pressure that overcomes the osmotic pressure of seawater.
Pre-Treatment
The seawater goes through pre-treatment so that its SDI falls below 5 and free chlorine stays below 0.1 ppm.
Gradual Pressurisation
As the high-pressure pump starts, the feed pressure is raised gradually over 30–60 seconds.
Separation in the Spiral Element
The water travels along the channels of the spiral-wound element in the 4 inch pressure vessel; as water molecules pass through the polyamide layer, most of the salts remain on the surface.
Product Water Leaves Through the Tube
The treated water collects in the 19 mm product water tube and is drawn off from the product water outlet of the pressure vessel.
The Concentrate Is Separated
The salt-enriched concentrate leaves the system through a separate line; the recovery rate is set by the system design.
06Making the Right Choice
Is the FilmTec SW30-4040 Right for Your System?
The right choice for the FilmTec SW30-4040 depends on the pressure vessel size, pump pressure, feed flow rate and the quality of pre-treatment.
Pressure Vessel
The element measures 40.0 × 3.9 inches and fits a pressure vessel with a nominal 4 inch inner diameter.
Pump and Pressure
The test pressure is 55 bar and the maximum operating pressure 83 bar; the pump, vessel and pipework must suit this pressure class.
Flow Rate and Pressure Drop
The feed flow rate should not exceed 3.6 m³/hour per element, and the pressure drop should not exceed 1.0 bar per element or 3.4 bar per vessel.
Pre-Treatment Quality
SDI should be kept below 5 and free chlorine below 0.1 ppm; otherwise the membrane wears out prematurely.
07Maintenance and Use
Operation and Maintenance Notes
The performance of the FilmTec SW30-4040 depends on keeping within the operating limits in the manufacturer’s data sheet.
- Once the element has been wetted, it must always be kept moist and must not be allowed to dry out.
- At first start-up, the product water produced in the first hour is not used but discharged.
- Avoid sudden changes in pressure and flow when starting up and shutting down; raise the feed pressure gradually over 30–60 seconds.
- Monitor the pressure drop regularly; when it approaches the limit of 1.0 bar per element or 3.4 bar per vessel, membrane cleaning should be considered.
- Chemical cleaning should be short-term and within pH 1–13; in continuous operation the pH 2–11 range should be maintained.
- The water temperature should not exceed 45 °C, nor the operating pressure 83 bar.
08Frequently Asked Questions
Common Questions
What does the FilmTec SW30-4040 do?
It is the membrane element that separates salt from water in seawater reverse osmosis systems. As seawater fed at high pressure crosses the polyamide thin-film composite layer, most of the dissolved salts are separated into the concentrate; the data sheet gives the stabilised salt rejection as 99.7%.
How much water does it produce per day?
According to the manufacturer’s data sheet, the FilmTec SW30-4040 delivers 7.4 m³ (1,950 gallons) of product water per day under test conditions of 32,000 ppm NaCl, 25 °C, 8% recovery and 55 bar. The output of a single element may vary by ±20%; the actual value depends on the salinity and temperature of the raw water and the operating pressure.
Which pressure vessel does it fit?
The FilmTec SW30-4040 fits a pressure vessel with a nominal 4 inch inner diameter. The element withstands operating pressures of up to 83 bar; the vessel and connections must also suit the system’s working pressure.
Can it be run at lower pressure?
Yes. The manufacturer states that SW30 elements can also be run at lower pressure to reduce the size of the pump. As pressure falls, output decreases; the system design should be based on this balance.
What should be watched during start-up?
The feed pressure should be raised gradually over 30–60 seconds, and sudden changes in pressure and flow should be avoided. The product water produced in the first hour is not used; from then on, the wetted element is always kept moist.
Does the membrane come with a warranty?
Units, valves, pumps and tanks carry a 2-year warranty and taps a 1-year warranty. Filters, membranes, resin and salt are consumables and fall outside the warranty.
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Warranty
ConsumableThis product is classed as a consumable or spare part; because its life depends on use, it is not covered by warranty. Faulty or incorrectly shipped items are replaced — just get in touch with us.
Withdrawal and returns
Distance sales agreementThe right of withdrawal and the return terms are set out in detail in the distance sales agreement. Systems that have been installed and commissioned, and made-to-order products, are outside its scope.
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