CSM RE4021-BLN

Summary

Product identification

• Model: RE4021-BLN
• Description: Low pressure grade RO element for brackish water / low TDS water.
• Applications: Industrial, Municipal, Semiconductor
• General Features: Low-Energy Consumption
• Membrane Type: Thin-Film Composite
• Membrane Material: Polyamide (PA)
• Element Configuration: Spiral-Wound, FRP Wrapping

Performance Data (Test Conditions)

• Permeate Flow Rate: 1,200 GPD (4.5 m³/day)
• Nominal Salt Rejection: 99.2% (Minimum 99.0%)
• Effective Membrane Area: 35 ft² (3.3 m²)
• Test Conditions:
  • 1,500 mg/L NaCl solution
  • 150 psig (1.03 MPa) applied pressure
  • 15% recovery
  • 77°F (25°C)
  • pH 6.5–7.0
  • Permeate flow rate for each element may vary +25 / -25%.

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

Mechanical / hydraulic

• Element Shell: FRP (Fiber Reinforced Plastic)
• Dimensions (Model RE4021-BLN):
  • A: 21.0 inch (533.4 mm)
  • B: 3.9 inch (99 mm)
  • C: 0.75 inch (19.1 mm)
  • D/E: 1.1 inch (28.0 mm)
• Included Components: Each membrane element supplied with one interconnector (coupler) and four O-rings.
• Part Numbers:
  • Inter-Connector: SWA01050
  • Brine Seal: SWA01046
• Vessel Compatibility: All RE4021 elements fit nominal 4.0 inch (101.6 mm) I.D. pressure vessels.

General Handling Procedures

• Storage:
  • Elements must be kept dry at room temperature (7–32°C; 40–95°F) and should not be stored in direct sunlight.
  • For WET-TYPE, the preservative solution (1% sodium metabisulfite solution) is added to prohibit the growth of micro-organisms.
• Initial Operation:
  • 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.
• Precautions:
  • 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.
  • Be aware of glass fiber strands from the FRP 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 OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet