CSM RE4040-FD

Summary

Product identification

The RE 4040-FD reverse osmosis element is a fouling-resistant product with a thick feed spacer, designed for wastewater reuse applications.

• Permeate flow rate: 1,800 GPD (6.8 m³/day)
• Nominal salt rejection: 99.7%
• Minimum salt rejection: 99.4%
• Effective membrane area: 75 ft² (6.9 m²)
• Membrane type: Thin-Film Composite
• Membrane material: Polyamide (PA)
• Element configuration: Spiral-Wound, FRP Wrapping

Performance is based on testing with a 2,000 mg/L NaCl solution at 225 psig (1.5 MPa) applied pressure, 15% recovery, 77 °F (25 °C), and pH 6.5–7.0. Permeate flow rate for each element may vary but will be no more than 15%. Each element is vacuum sealed in a polyethylene bag containing 1.0% SBS (sodium bisulfite) solution and individually packaged.

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: 18 gpm (4.09 m³/hr)
• Min. Concentrate Flow Rate: 4 gpm (0.91 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 rates):

• 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

Mechanical / hydraulic

• Model Name: RE4040-FDn
• Dimensions:
  • A: 40.0 inch (1,016 mm)
  • B: 4.0 inch (102 mm)
  • C: 0.75 inch (19.1 mm)
  • D: 1.05 inch (26.7 mm)
  • E: 1.05 inch (26.7 mm)
• Inter-connector Part Number: 40000305
• Brine Seal Part Number: 40000306

All RE4040 elements fit nominal 4.0 inch (102 mm) I.D. pressure vessels. Each membrane element is supplied with one brine seal, one interconnector (coupler), and four o-rings.

General Handling Procedures

• Elements 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. The standard storage solution contains 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 for preventing biological growth.
• 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; incompatible chemicals may void the limited warranty.
• Permeate pressure must always be equal to or less than the feed/concentrate pressure; damage caused by permeate back pressure voids the limited warranty.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions from the original PDF datasheet. For contractual purposes, data must match the specific OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet