NF-2540

Summary

Product identification

• Product Line: FilmTec™ Membranes
• Product Name: FilmTec™ NF270 Nanofiltration Elements for Commercial Systems
• Description: These elements are ideal for removing a high percentage of TOC and THM precursors with medium to high salt passage and medium hardness passage. They are an ideal choice for surface water and ground water applications where good organic removal is desired with partial softening.
• Membrane Type: Polyamide Thin-Film Composite

Typical Properties

• NF270-2540 (Part Number: 149986)
  • Active Area: 28 ft² (2.6 m²)
  • Applied Pressure: 70 psig (4.8 bar)
  • Permeate Flow Rate: 850 gpd (3.2 m³/d)
  • Stabilized Salt Rejection: >97.0%
• NF270-4040 (Part Number: 149987)
  • Active Area: 82 ft² (7.6 m²)
  • Applied Pressure: 70 psig (4.8 bar)
  • Permeate Flow Rate: 2,500 gpd (9.5 m³/d)
  • Stabilized Salt Rejection: >97.0%

Note on test conditions: Permeate flow and salt rejection are based on 2,000 ppm MgSO₄, 77°F (25°C), and 15% recovery at the specified pressure. Note on variability: Permeate flows for individual NF270-2540 elements may vary by -20% / +30%. NF270-4040 individual elements may vary -15% / +50%.

Mechanical / Hydraulic

Element Dimensions (Inches / mm)

• NF270-2540
  • A: 40.0 (1,016)
  • B: 1.19 (30)
  • C: 0.75 (19)
  • D: 2.4 (61)
• NF270-4040
  • A: 40.0 (1,016)
  • B: 1.05 (27)
  • C: 0.75 (19)
  • D: 3.9 (99)

Note: NF270-2540 has a tape outer wrap. NF270-4040 has a fiberglass outer wrap.

Operating Limits

• 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)
  • Across an entire pressure vessel (housing): 30 psi (2.1 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. Oxidation damage is not covered under warranty.)

General Operation Guidelines

• Keep elements moist at all times after initial wetting.
• To prevent biological growth during prolonged system shutdowns, it is recommended that membrane elements be immersed in a preservative solution.
• 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.
  • Feed pressure should be increased gradually over a 30-60 second timeframe.
  • Cross-flow velocity at set operating point should be achieved gradually over 15-20 seconds.
• Avoid static permeate-side backpressure at all times.
• The use of this product in and of itself does not necessarily guarantee the removal of cysts and pathogens from water. Effective cyst and pathogen reduction is dependent on the complete system design and on the operation and maintenance of the system.
• Permeate obtained from the first hour of operation should be discarded.

Disclaimer This summary is based on 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