CSM NE2540-70

Summary

Product Identification

The CSM NE2540-70 is a normal grade Nanofiltration (NF) element featuring medium monovalent ion rejection.

• Membrane type: Thin-Film Composite
• Membrane material: Polyamide (PA)
• Element configuration: Spiral-Wound, FRP Wrapping

Operating Limits

• Max. Pressure Drop / Element: 15 psi (0.1 MPa)
• Max. Pressure Drop / 240” Vessel: 60 psi (0.41 MPa)
• Max. Operating Pressure: 600 psi (4.14 MPa)
• Max. Feed Flow Rate: 6 gpm (1.36 m³/hr)
• Min. Concentrate Flow Rate: 1 gpm (0.23 m³/hr)
• Max. Operating Temperature: 113 °F (45 °C)
• Operating pH Range: 2.0 – 11.0
• CIP pH Range: 1.0 – 13.0
• Max. Turbidity: 1.0 NTU
• Max. SDI (15 min): 5.0
• Max. Chlorine Concentration: < 0.1 mg/L

Feed Water

Design Guidelines for Various Water Sources (Flux in gfd):

• Wastewater Conventional (SDI < 5): 8–12 gfd
• Wastewater Pretreated by UF/MF (SDI < 3): 10–14 gfd
• Seawater, Open Intake (SDI < 5): 7–10 gfd
• Seawater, Beach Well (SDI < 3): 8–12 gfd
• Surface Water (SDI < 5): 12–16 gfd
• Surface Water (SDI < 3): 13–17 gfd
• Well water (SDI < 3): 13–17 gfd
• RO permeate (SDI < 1): 21–30 gfd

Saturation Limits (Using Antiscalants):

• Langlier Saturation Index (LSI): < +1.5
• Stiff and Davis Saturation Index (SDSI): < +0.5
• CaSO₄: 230% saturation
• SrSO₄: 800% saturation
• BaSO₄: 6,000% saturation
• SiO₂: 100% saturation

Product Water

Stated Product Performance (based on test conditions):

• Permeate flow rate: 450 GPD (1.7 m³/day)
  • Test conditions for monovalent ions: 2,000 mg/L NaCl solution at 75 psig (0.5 MPa) applied pressure, 15% recovery, 77 °F (25 °C), pH 6.5–7.0.
  • Note: Permeate flow rate for each element may vary but will be no more than 20%.
• Monovalent ion rejection (NaCl): 40.0 – 70.0%
  • Test conditions: 2,000 mg/L NaCl solution at 75 psig (0.5 MPa) applied pressure, 15% recovery, 77 °F (25 °C), pH 6.5–7.0.
• Divalent ion rejection (CaCl₂): 45.0 – 70.0%
  • Test conditions: 500 mg/L CaCl₂ solution at 75 psig (0.5 MPa) applied pressure, 15% recovery, 77 °F (25 °C), pH 6.5–7.0.
• MgSO₄ rejection: 97.0%
  • Test conditions: Equivalent to NaCl test conditions.
• Effective membrane area: 27 ft² (2.5 m²)

Mechanical / Hydraulic

Dimensions:

• A: 40.0 inch (1,016 mm)
• B: 2.5 inch (64 mm)
• C: 0.75 inch (19.1 mm)
• D: 1.05 inch (26.7 mm)
• E: 1.05 inch (26.7 mm)

Fitting and Packaging:

• All NE2540 elements fit nominal 2.5 inch (64 mm) I.D. pressure vessels.
• Each membrane element is supplied with one brine seal, one interconnector (coupler), and four o-rings.
• Elements are vacuum sealed in a polyethylene bag containing 1.0% SBS (sodium bisulfite) solution and individually packaged in a cardboard box.

General Handling Procedures

• Elements in boxes must be kept dry at room temperature (7–32 °C; 40–95 °F) and not stored in direct sunlight.
• If the polyethylene bag is damaged, a new preservative solution (sodium bisulfite) must be added and air-tight sealed to prevent drying and biological growth.
• Permeate from the first hour of operation should be discarded to flush out the preservative solution.
• Elements should be immersed in a preservative solution during storage, shipping, and system shutdowns to prevent biological growth and freezing. Standard storage solution is 1% by weight sodium bisulfite or sodium metabisulfite (food grade). For short-term storage (one week or less), 1% by weight sodium metabisulfite solution is adequate.
• Keep elements moist at all times after initial wetting.
• Avoid excessive pressure and flow spikes.
• Only use chemicals compatible with the membrane elements and components.
• Permeate pressure must always be equal to or less than the feed/concentrate pressure.

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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