CSM RE4021-BE

Summary

Product identification

The RE4021-BE is a high productivity reverse osmosis (RO) element designed for brackish water applications.

General Features

• Membrane Type: Thin-Film Composite
• Membrane Material: Polyamide (PA)
• Element Configuration: Spiral-Wound, FRP Wrapping
• Permeate Flow Rate: 1,200 GPD (4.5 m³/day)
• Nominal Salt Rejection: 99.5% (Minimum 99%)
• Effective Membrane Area: 35 ft² (3.3 m²)

Note: General features are based on test conditions of 2,000 mg/L NaCl solution at 225 psig (1.55 MPa) applied pressure, 8% recovery, 77°F (25°C), and pH 6.5–7.0. Permeate flow rate for individual elements may vary ±25%.

Mechanical / Hydraulic

• Model Name: RE4021-BE
• Dimensions:
  • A: 21.0 inch (533.4 mm)
  • B: 3.9 inch (99.0 mm)
  • C: 0.75 inch (19.1 mm)
  • D/E: 1.05 inch (26.7 mm)
• Accessories:
  • Inter-Connector Part Number: SWA01050
  • Brine Seal Part Number: SWA01046
• Each membrane element is supplied with one interconnector (coupler) and four O-rings.
• All RE4021 elements fit nominal 4.0 inch (101.6 mm) I.D. pressure vessels.
• The element shell is Fiber Reinforced Plastic (FRP).

Operating Limits

• Max. Pressure Drop / Element: 15 psi (0.10 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

General Handling Procedures

• Elements must be kept dry at room temperature (7–32°C; 40–95°F) and not stored in direct sunlight.
• For wet-type elements, a preservative solution (1% sodium metabisulfite solution) is added to inhibit microbial growth.
• Permeate from the first hour of operation should be discarded.
• Stabilized salt rejection is generally achieved within 1–48 hours of continuous use.
• 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 warranty.
• Permeate pressure must always be equal to or less than the feed/concentrate pressure. Damage caused by permeate back pressure voids the element limited warranty.
• Be aware of glass fiber strands from the FRP element shell and use safety equipment.

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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 specific OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet