XUS290904

Summary

Product identification

DOW™ XUS290908 and XUS290904 Nanofiltration Elements offer a unique combination of features:

• Designed to treat highly viscous liquids and improve cleaning effectiveness.
• Features a 48-mil feed spacer to reduce pressure drop across the pressure vessel.
• Incorporates DOW HYPERSHELL™ Reverse Osmosis technology, a machined polypropylene rigid outer shell, which:
  • Minimizes channeling and prevents premature element failures.
  • Improves hydrodynamics, leading to energy savings and efficient Clean In Place (CIP).
  • Allows safer and faster loading/unloading due to the rigid case.
  • Provides easy and permanent identification via laser-etched model names and serial numbers.
• Sanitary element design: All materials comply 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 while passing monovalent salts.

Product Specifications

• Permeate flow and salt (NaCl) rejection based on standard test conditions: 2,000 ppm NaCl, 150 psi (10.3 bar), 77°F (25°C), pH 8, 15% recovery.

Element Dimensions

• 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 (H₂O₂) 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 (H₂O₂) Limit:
  • Continuous Operation: 20 ppm
  • Short-Term Cleaning: 1,000 ppm

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 are normally cleaned prior to initial use. If formulated cleaning agents are unavailable, an alkaline wash with a wetting agent is recommended.
• Avoid abrupt pressure or cross-flow variations during start-up, shutdown, cleaning, or other sequences to prevent membrane damage.
• Gradual Start-up Recommendations:
  • Feed pressure should be increased gradually over 30-60 seconds.
  • Before initiating cross-flow at high permeate flux conditions, maintain the set operating pressure for 5-10 minutes.
  • Achieve cross-flow velocity at the set operating point gradually over 15-20 seconds.
  • Avoid permeate-side backpressure at all times.
  • Discard any concentrate or permeate obtained from the first hour of operation.

General Information

• Keep elements moist at all times after initial wetting.
• To prevent biological growth during system shutdowns, immerse elements in a preservative solution.
• These membranes may be subject to drinking water application restrictions in some countries; check application status before use and sale.
• The use of this product does not necessarily guarantee the removal of cysts and pathogens from water; effective reduction depends on complete system design, operation, and maintenance.

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Disclaimer: This summary is an extraction and reformatting of information from the provided text. It may not include all figures, footnotes, or the most recent revisions. For contractual data and complete specifications, the official OEM PDF revision used on the project should be consulted.

Official datasheet (PDF)

PDF datasheet