DOW FILMTEC XLE-4040 is the most productive, lowest pressure RO membrane available, delivering the lowest total system cost. It may be cleaned over a wide pH range (pH 1-13) for the most effective cleaning.
• High flux results in high yields;
• High rejection provides good water quality;
• Filmtec performance and quality
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.
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.
• 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 30 psi (2.1 bar).
• Avoid static permeate-side backpressure at all times.
|Product||Part Number||Applied Pressure psig (bar)||Permeate Flow Rate gpd (m3/d)||Stabilized Salt Rejection (%)|
|XLE-4040||154546||100 (6.9)||2,600 (9.8)||99|
New DOW FILMTEC™ XLE elements offer better system performance and economics by operating at very low applied pressure. XLE membrane, made with a patented technology, provides consistent and reliable system performance. And for added convenience, XLE elements are available in a dry state for rapid start-up (see Figure 1 on reverse). The new XLE series of elements replaces TW30LE elements which were made with an older membrane technology.
• Membrane Type Polyamide Thin-Film Composite
• Maximum Operating Temperaturea 113°F (45°C)
• Maximum Operating Pressure 600 psi (41 bar)
• Maximum Pressure Drop 13 psig (0.9 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
Ideal Applications Include:
Commercial Water treatment systems;
medical and research institutions;