LC LE - 4040, Reverse osmosis membrane (membrane element) Dow Filmtec Dupont

Operating Limits
Membrane type: Polyamide Thin-Film Composite 113°F (45°C)
Maximum operating temperaturea: 113°F (45°C)
Maximum operating pressure: 600 psig (41 bar)
Maximum pressure drop: 15 psig (1.0 bar)
Maximum feed flow rate, gpm (m3/h): 16 gpm (3.6 (m3/h))
pH range, continuous operationa: 2-11
pH range, short-term cleaningb: 1–13
Maximum Feed Silt Density Index: SDI 5
Free chlorine concentrationc: < 0.1 ppm

a. Maximum temperature for continuous operation above PH 10 is 95°F (35°C).
b. Refer to Cleaning Guidelines in specification sheet 609-23010.
c. Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Since oxidation damage is not covered under warranty, Dow recommends removing residual free chlorine and other oxidants by pretreatment prior to membrane exposure. Please refer to technical bulletin 609-22010 for more information.

General 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.

Important Information
Keep elements moist at all times after initial wetting.
If operating limits and guidelines given in this Product Bulletin are not strictly followed, the limited warranty in Form No. 609-35010 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.

Regulatory Note
These membranes may be subject to drinking water application restrictions in some countries: please check the application status before use and sale.

Diameter, inch: 4 "
Pressure, atm .: 15
Selectivity,: 99.2
Productivity, m3 / day: 9.5
Filtering surface area, m2: 8.7 

Reverse osmosis membranes Filmtec LC LE-4040 manufactured by Dow Chemical (USA) provide effective water purification from a wide range of dissolved substances of both organic and inorganic origin (up to 99, 8).

They are characterized by high resistance to chemical compounds, stable structure, low energy consumption and provide higher performance compared to analogues.