XUS290508

Summary

Product identification

The DOW™ XUS290508 and XUS290504 High Temperature Nanofiltration Elements offer the following features:

• Up to 70°C continuous operating temperature capability due to distinct element and membrane design.
• Robust DOW FILMTEC™ nanofiltration membrane sheet.
• A 34 mil feed spacer allows for maximum active membrane surface area while lessening the impact of fouling, reducing the pressure drop across the pressure vessel and enhancing cleaning effectiveness.

Typical applications include:

• Waste brine recycling from sugar decolorization.
• Concentration of thin juice sugars or components in chemical processing.
• Sulfate removal in Chloralkali process streams.

Product specifications:

• DOW XUS290508
  • Active Area: 320 ft² (30 m²)
  • Feed Spacer Thickness: 34 mil
  • Minimum ATD OD: 7.9 in.
  • ATD included: Yes
• DOW XUS290504
  • Active Area: 70 ft² (6 m²)
  • Feed Spacer Thickness: 34 mil
  • Minimum ATD OD: 3.9 in.
  • ATD included: Yes

Element dimensions:

• XUS290508
  • A: 40 in. (1016 mm)
  • B: 1.125 ID (29 ID mm)
  • C: 7.9 in. (201 mm)
• XUS290504
  • A: 40.0 in. (1016 mm)
  • B: 1.03 in. (26 mm)
  • C: 0.75 OD (19 OD mm)
  • D: 3.9 in. (99 mm)

DOW HYPERSHELL™ 4040 elements are designed to fit standard 4040 pressure vessels.

Operating limits

• Maximum Operating Temperature: 70°C (158°F)
• Maximum Operating Pressure at 80°C: 28 bar (406 psi)
• Maximum Single Element Pressure Drop < 50°C: 0.9 bar (13.1 psi)
• Maximum Single Element Pressure Drop < 80°C: 0.3 bar (4.4 psi)
• Maximum Vessel Pressure Drop < 50°C: 4.1 bar (60 psi)
• Maximum Vessel Pressure Drop < 80°C: 1.2 bar (17 psi)
• pH Range, Continuous Operation (<35°C): pH2 – pH11
• pH Range, Continuous Operation (35°C to 50°C): pH3 – pH10
• pH Range, Continuous Operation (< 70°C): pH4 – pH8
• Hydrogen Peroxide Limit: 20 ppm
• Free Chlorine Tolerance: Below Detectable Limits
• Maximum Feed Silt Density Index (SDI₁₅): SDI 5

Mechanical / hydraulic

Clean in Place (CIP) Parameters

• Maximum CIP Pressure: 15 to 75 psi (1 to 5 bar)
• pH Range, Cleaning (45°C to 50°C): pH1.8 – pH11.0
• pH Range, Cleaning (< 45°C): pH1 – pH13
• Hydrogen Peroxide Limit, Short-Term Cleaning: 1,000 ppm

Important Start-Up Information New elements are normally cleaned prior to initial use. An alkaline wash with a wetting agent is recommended if cleaning with formulated agents is not available. Avoid abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning, or other sequences to prevent possible membrane damage. During start-up, a gradual change from a standstill to operating state is recommended:

• Feed pressure should be increased gradually over a 30-60 second time frame.
• Before initiating cross-flow at high permeate flux conditions, the set operating pressure should be maintained for 5-10 minutes.
• Cross-flow velocity at the set operating point should be achieved gradually over 15-20 seconds.
• Avoid permeate-side backpressure at all times.
• Any concentrate or permeate obtained from the first hour of operation should be discarded.

General Information

• Keep elements moist at all times after initial wetting.
• To control the spread of biological growth during system shutdowns, it is recommended that elements be immersed in a preservative solution.

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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