LewaBrane RO S400 HR

Summary

Product identification

Lewabrane® RO S400 HR elements are spiral-wound, composite polyamide membrane elements specifically designed for the desalination of seawater. The S400 HR membrane features an extremely durable, highly cross-linked polymeric separating layer, making it suitable for high salinity and high pressure applications. These membrane elements are recommended for single pass applications where stable salt rejection performance is a critical consideration throughout the operating lifetime.

Each RO element is wet tested, preserved in a 1% weight sodium bisulfite solution, and vacuum packed in oxygen barrier bags.

Key element specifications:

• Feed spacer thickness: 0.8 mm (31 mil)
• Membrane area: 37.2 m² (400 ft²)

Product water

Performance is tested under the following conditions: applied pressure 55.2 bar (800 psi), NaCl concentration 32,000 mg/l (or when tested on a mixed solution of 32,000 mg/l NaCl and 5 mg/l Boron), operating temperature 25 °C (77 °F), pH 8, and recovery rate 8 %.

• Salt rejection, average: 99.8 %
• Salt rejection, minimum: 99.5 %
• Boron rejection, typical: 93.0 %
• Permeate flow rate, average: 24.6 m³/d (6500 gpd)
• Permeate flow rate, minimum: 19.7 m³/d (5200 gpd)

Operating limits

• Operating pressure, maximum: 83 bar (1200 psi)
• Operating temperature, maximum: 45 °C (113 °F)
• pH range during operating: 2 - 11
• pH range during cleaning: 1 - 12
• Pressure drop per element, maximum: 1.0 bar (15 psi)
• Pressure drop per vessel, maximum: 3.5 bar (50 psi)
• Permeate back pressure should not exceed feed pressure at any time.
• Consider cleaning if the pressure drop increases by 20% or water permeability decreases by 10%.
• Use only chemicals which are compatible with the membrane.

Feed water

• Feed water SDI, maximum: 5
• Feed flow, maximum: 18.0 m³/h (80 gpm)
• Concentrate flow, minimum: 2.7 m³/h (12 gpm)
• Chlorine concentration, maximum: 0.1 ppm

Mechanical / hydraulic

Element Dimensions:

• Length: 1016 mm (40 inch)
• Diameter: 201 mm (7.9 inch)
• ID: 29 mm (1.125 inch)

Installation and Storage Notes

• Treat RO Elements with care; do not drop the element.
• During storage, avoid freezing and direct sunlight. The temperature should be below 35 °C (95 °F).
• After installation, keep the RO Elements wet. Use a compatible preservative for storage durations longer than 7 days.
• During the initial start-up, discharge the first permeate to drain for 30 minutes.

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Disclaimer: This summary is based on extracted text and may not include all figures, footnotes, or the latest revisions present in the official OEM PDF datasheet. For contractual data, please refer to the specific OEM PDF revision used for your project.

Official datasheet (PDF)

PDF datasheet