CSM RE2521-SHN

Summary

Product Identification

• Model Name: RE 2521-SHN
• Description: High Rejection RO element for seawater and high salinity well water
• Membrane Type: Thin-Film Composite
• Membrane Material: Polyamide (PA)
• Element Configuration: Spiral-Wound, FRP Wrapping

Specifications and Performance

The stated product performance is based on data taken after 30 minutes of operation at the following test conditions:

• 32,000 mg/L NaCl solution

• 800 psig (5.5 MPa) applied pressure

• 4% recovery

• 77 °F (25 °C)

• pH 6.5–7.0

• Permeate Flow Rate: 225 GPD (0.85 m³/day)

• Stabilized Salt Rejection: 99.75%

• Minimum Salt Rejection: 99.6%

• Effective Membrane Area: 12 ft² (1.1 m²)

• Permeate flow rate for each element may vary but will be no more than 20%.

Operating Limits

• Max. Pressure Drop / Element: 15 psi (0.1 MPa)
• Max. Pressure Drop / 240” Vessel: 60 psi (0.41 MPa)
• Max. Operating Pressure: 1,200 psi (8.27 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 Guidelines

Design Guidelines for Various Water Sources:

• 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

• All RE2521 elements fit nominal 2.5 inch (64 mm) I.D. pressure vessels.
• Each membrane element 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 a cardboard box.

Dimensions: See the official PDF for exact tabulated values for element dimensions (A, B, C, D, E) and part numbers for the element, interconnector, and brine seal.

General Handling Notes

• Elements contained in the boxes must be kept dry at room temperature (7–32 °C; 40–95 °F) and should not be 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 (i.e., 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. Use of such chemicals may void the element limited warranty.
• Permeate pressure must always be equal or less than the feed/concentrate pressure. Damage caused by permeate back pressure voids the element 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 document. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet