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DOW FILMTEC SW30-4040 Membrane

Product Description

DOW FILMTEC SW30-4040 membrane elements have one of the highest flow rates available to meet the water demands of both sea-based and land-based desalinators. DOW FILMTEC SW30 elements may also be operated at lower pressure to reduce pump size, cost, and operating expenses.

Uses for SW30-4040 Membrane Elements

Advantages

  • High flux reduces energy use or pressure required;
  • good rejection results in good quality water

Important Information

Proper start-up of reverse osmosis water treatment systems is essential to prepare the membranes for operating service and to prevent membrane damage due to overfeeding or hydraulic shock. Following the proper start-up sequence also helps ensure that system operating parameters conform to design specifications so that system water quality and productivity goals can be achieved.
Before initiating system start-up procedures, membrane pretreatment, loading of the membrane elements, instrument calibration and other system checks should be completed.
Please refer to the application information literature entitled “Start-Up Sequence” (Form No. 609-02077) for more information.

Operation Guidelines

Avoid any abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning or other sequences to prevent possible membrane damage. During start-up, a gradual change from a standstill to operating state is recommended as follows:
• Feed pressure should be increased gradually over a 30-60 second time frame.
• Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds.
• Permeate obtained from first hour of operation should be discarded.

General Information

• Keep elements moist at all times after initial wetting.
• If operating limits and guidelines given in this bulletin are not strictly followed, the limited warranty will be null and void.
• To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution.
• The customer is fully responsible for the effects of incompatible chemicals and lubricants on elements.
• Maximum pressure drop across an entire pressure vessel (housing) is 50 psi (3.4 bar).
• Avoid static permeate-side backpressure at all times.

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Specifications

Product Part Number Applied Pressure psig (bar) Permeate Flow Rate gpd (m3/d) Stabilized Salt Rejection (%)
SW30-4040 80741 800 (55) 1,950 (7.4) 99.4
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Features

Improved DOW FILMTEC™ seawater reverse osmosis elements offer the highest productivity while maintaining excellent salt rejection.
• DOW FILMTEC SW30 membrane elements have the highest flow rates available to meet the water demands of both sea-based and land-based desalinators.
• DOW FILMTEC SW30 elements may also be operated at lower pressure to reduce pump size, cost and operating expenses.
• Improved DOW FILMTEC seawater membrane combined with automated, precision element fabrication result in the most consistent product performance available.

Operating Limits

• Membrane Type Polyamide Thin-Film Composite
• Maximum Operating Temperature 113°F (45°C)
• Maximum Operating Pressure 1,000 psi (69 bar)
• Maximum Pressure Drop 15 psig (1.0 bar)
• pH Range, Continuous Operation 2 - 11
• pH Range, Short-Term Cleaning 1 - 13
• Maximum Feed Silt Density Index SDI 5
• Free Chlorine Tolerance <0.1 ppm

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Ideal Applications Include:
Seawater desalination;
Marine (yacht) applications
Small desalination systems

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[custom-documents]DOW FILMTEC SW30-4040 Membrane [/custom-documents]
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