XUS290908

Summary

Product identification

• Product Names: DOW™ XUS290908 and XUS290904 Nanofiltration Elements
• Description: These Nanofiltration Elements offer a unique combination of features designed to treat highly viscous liquids and improve cleaning effectiveness.
• Key Features:
  • 48-mil feed spacer to reduce the pressure drop across the pressure vessel.
  • DOW HYPERSHELL™ Reverse Osmosis technology, featuring a machined polypropylene rigid outer shell:
    • Minimizes channeling and prevents premature element failures throughout product lifetime.
    • Improves hydrodynamics of the element, resulting in energy savings and efficient Clean In Place (CIP).
    • Allows for safer and faster loading and unloading of elements due to the rigid HyperShell case.
    • Provides easy and permanent identification through laser-etched model names and serial numbers.
  • Sanitary element design: All materials of construction are compliant with U.S. Food and Drug Administration regulations for indirect contact with food.
  • Robust DOW FILMTEC™ NF245 membrane sheet:
    • Designed to reject organics with a molecular weight above 300 amu.
    • Passes monovalent salts.
• Product Specifications:
  • DOW XUS290908
    • Active Area: 270 ft² (25 m²)
    • Feed Spacer Thickness: 48 mil
    • Minimum ATD OD: 7.9 inch
    • ATD included: No
  • DOW XUS290904
    • Active Area: 50 ft² (4.7 m²)
    • Feed Spacer Thickness: 48 mil
    • Minimum ATD OD: 3.8 inch
    • ATD included: No Note: Permeate flow and salt (NaCl) rejection are based on the following standard test conditions: 2,000 ppm NaCl, 150 psi (10.3 bar), 77°F (25°C), pH 8, 15% recovery.
• Element Dimensions:
  • XUS290908
    • A: 38 in. (965 mm)
    • B: 1.125 in. ID (28.58 mm ID)
    • C: 7.9 in. (201 mm)
  • XUS290904
    • A: 38 in. (965 mm)
    • B: 0.83 in. ID (21.08 mm ID)
    • C: 3.8 in. (97 mm)
• DOW HYPERSHELL™ elements are designed to fit Schedule 40, 8 inch stainless pipe (nominal 7.98 inch ID).

Operating limits

• Maximum Operating Pressure: 800 psig (54.8 bar)
• Maximum Operating Temperature:
  • pH 2 – pH 10: 122°F (50°C)
  • Above pH 10: 95°F (35°C)
• pH Range: pH 2 – pH 11
• Free Chlorine Tolerance: Below Detectable Limits
• Hydrogen Peroxide Limit, Continuous Operation: 20 ppm

Clean In Place (CIP) Parameters

• Maximum CIP Pressure: 15 to 75 psi (1 to 5 bar)
• Maximum CIP Temperature:
  • pH 1.8 to pH 11: 122°F (50°C)
  • pH 1.8 to pH 11.2: 113°F (45°C)
• pH Range: pH 1.8 – pH 11.2
• Free Chlorine Tolerance: Below Detectable Limits
• Hydrogen Peroxide Limit:
  • Continuous Operation: 20 ppm
  • Short-Term Cleaning: 1,000 ppm

Mechanical / hydraulic

• Design Guidelines:
  • Maximum Pressure Drop (ΔP) per element:
    • DOW™ XUS290908: 13 psi (0.9 bar)
    • DOW™ XUS290904: 15 psi (1.0 bar)
  • Maximum Pressure Drop (ΔP) per vessel: 60 psi (4.1 bar)
  • Maximum Cross-Flow:
    • DOW™ XUS290908: 80 gpm (18.2 m³/h)
    • DOW™ XUS290904: 30 gpm (6.8 m³/h)

Important Start-Up Information

• New elements should be cleaned prior to initial use; an alkaline wash with a wetting agent is recommended if formulated cleaning agents are not available.
• Avoid any abrupt pressure or cross-flow variations on the spiral elements during start-up, shutdown, cleaning, or other sequences to prevent potential membrane damage.
• During start-up, a gradual change from standstill to operating state is recommended:
  • Feed pressure should be increased gradually over a 30-60 second timeframe.
  • Before initiating cross-flow at high permeate flux conditions (e.g., start-up with high temperature water), 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 prevent biological growth during system shutdowns, it is recommended that elements be immersed in a preservative solution.

Regulatory Note

These membranes may be subject to drinking water application restrictions in some countries; users should check the application status before use and sale.

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Disclaimer: This summary is generated from extracted text and may not include all figures, footnotes, or the latest revisions. Contractual data must always match the OEM PDF revision used on the project.

Official datasheet (PDF)

PDF datasheet