NF90-2540

Summary

Product Identification

The FilmTec™ NF90 Nanofiltration Elements are designed for commercial systems. This document refers to:

• FilmTec™ NF90-2540 (Part Number 149982)

Description

FilmTec™ NF90 Membrane Elements offer high productivity and remove a significant percentage of salts, nitrate, iron, and organic compounds like pesticides, herbicides, and THM precursors. Their low net driving pressure allows for effective removal of these compounds at reduced operating pressures.

Performance

Permeate flow and salt rejection are based on test conditions of 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%
• NF90-4040
  • Applied Pressure: 70 psig (4.8 bar)
  • Permeate Flow Rate: 2,000 gpd (7.6 m³/d)
  • Minimum Salt Rejection: 98.7%

Permeate flows for individual NF90-2540 Elements may vary by -20% / +30%. NF90-4040 individual elements may vary -15% / +50%.

Dimensions – Inches (mm)

• NF90-2540
  • A: 40.0 (1,016)
  • B: 1.19 (30)
  • C: 0.75 (19)
  • D: 2.4 (61)
  • Outer wrap: Tape
• NF90-4040
  • A: 40.0 (1,016)
  • B: 1.05 (27)
  • C: 0.75 (19)
  • D: 3.9 (99)
  • Outer wrap: Fiberglass

Operating Limits

• Membrane Type: Polyamide Thin-Film Composite
• Maximum Operating Temperature: 113°F (45°C)
  • Maximum temperature for continuous operation above pH 10 is 95°F (35°C).
• Maximum Operating Pressure: 600 psi (41 bar)
• 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: 13 psig (0.9 bar)
  • fiberglassed: 15 psig (1.0 bar)
• pH Range
  • Continuous Operation: 2 – 11
  • 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. DuPont Water Solutions recommends removing residual free chlorine by pretreatment prior to membrane exposure.

General Operating Guidelines

• Avoid abrupt pressure or cross-flow variations during start-up, shutdown, cleaning, or other sequences.
• During start-up, gradually increase feed pressure over 30-60 seconds.
• Achieve cross-flow velocity at the set operating point gradually over 15-20 seconds.
• Keep elements moist at all times after initial wetting.
• If operating limits and guidelines are not strictly followed, the limited warranty will be null and void.
• 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.
• Maximum pressure drop across an entire pressure vessel (housing) is 30 psi (2.1 bar).
• Avoid static permeate-side backpressure at all times.

Customer Notice

• The use of this product does not necessarily guarantee the removal of cysts and pathogens from water. Effective reduction depends on the 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 extracted text and may not include all figures, footnotes, or the latest revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet