NF90-400

Summary

Product identification

FilmTec™ NF90 Nanofiltration Elements are designed for commercial systems. They provide high productivity while removing a high percentage of salts, nitrate, iron, and organic compounds such as pesticides, herbicides, and THM precursors. The low net driving pressure allows for effective removal at low operating pressures.

• Membrane Type: Polyamide Thin-Film Composite
• Products:
  • NF90-2540 (Part Number 149982)
  • NF90-4040 (Part Number 149983)

Operating limits

• Maximum Operating Temperature: 113°F (45°C)
• Maximum Operating Pressure: 600 psi (41 bar)
• pH Range:
  • Continuous Operation: 2 – 11 (Maximum temperature for continuous operation above pH 10 is 95°F (35°C))
  • Short-Term Cleaning (30 min.): 1 – 12
• Maximum Feed Silt Density Index: SDI 5
• Free Chlorine Tolerance: <0.1 ppm (Under certain conditions, the presence of free chlorine and other oxidizing agents will cause premature membrane failure. Oxidation damage is not covered under warranty.)

Performance Data

Permeate flow and salt rejection are based on the following test conditions: 2,000 ppm MgSO₄, 77°F (25°C), and 15% recovery at the specified pressure.

• NF90-2540:
  • Applied Pressure: 70 psig (4.8 bar)
  • Permeate Flow Rate: 680 gpd (2.6 m³/d)
  • Minimum Salt Rejection: 97.0%
  • Individual element flow variation: -20% / +30%
• NF90-4040:
  • Applied Pressure: 70 psig (4.8 bar)
  • Permeate Flow Rate: 2,000 gpd (7.6 m³/d)
  • Minimum Salt Rejection: 98.7%
  • Individual element flow variation: -15% / +50%

Mechanical / hydraulic

Element Dimensions (Inches (mm)):

• Maximum Feed Flow Rate:
  • 4040 elements: 16 gpm (3.6 m³/hr)
  • 2540 elements: 6 gpm (1.4 m³/hr)
• Maximum Pressure Drop:
  • Tape wrapped elements: 13 psig (0.9 bar)
  • Fiberglassed elements: 15 psig (1.0 bar)
• Maximum pressure drop across an entire pressure vessel (housing): 30 psi (2.1 bar)

General Information

• Proper start-up of reverse osmosis water treatment systems is essential to prepare membranes and prevent damage. Refer to "Start-Up Sequence" (Form No. 45-D01609-en) for more information.
• Avoid abrupt pressure or cross-flow variations on spiral elements during start-up, shutdown, cleaning, or other sequences.
• During start-up, a gradual change is recommended: feed pressure should be increased gradually over 30-60 seconds; cross-flow velocity should be achieved gradually over 15-20 seconds.
• Keep elements moist at all times after initial wetting.
• Failure to strictly follow operating limits and guidelines will void the limited warranty.
• To prevent biological growth during prolonged system shutdowns, immerse membrane elements in a preservative solution.
• The customer is fully responsible for the effects of incompatible chemicals and lubricants on elements.
• Avoid static permeate-side backpressure at all times.
• The use of this product does not necessarily guarantee the removal of cysts and pathogens from water; effective reduction depends on complete system design, operation, and maintenance.
• Permeate obtained from the first hour of operation should be discarded.

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Disclaimer: This summary is based on the provided text extraction and may not include all figures, footnotes, or the latest revisions found in the official PDF datasheet. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet