X-Flow-Seaguard-40

Summary

Product identification

The X-Flow Seaguard 40 is an ultrafiltration membrane element, used as a pre-treatment for seawater reverse osmosis (SWRO). It operates in a dead-end mode with regular permeate-only backwash and chemically enhanced backwash. It is designed for standard seawater applications with low to moderate TSS and/or organic load.

• Article Code: 29B2FL395A
• Membrane Type: Ultrafiltration (UF)
• Membrane Material: Hydrophilic blend of polyvinylpyrrolidone (PVP) and polyethersulfone (PES)
• Nominal Pore Size: 20 nm
• Membrane Structure: Asymmetric/microporous
• Performance Characteristics: High performance, very good anti-fouling behavior

Operating limits

• Max. Trans-membrane Pressure: 300 kPa [43 psi]
• Max. Backflush Pressure: 300 kPa [43 psi]
• Temperature Range: 0-40 °C [32-104 °F]
• System Pressure: Max. system pressure should align with specifications from the membrane housing supplier.
• Temperature Changes: Avoid sudden temperature changes, particularly decreases. Do not exceed 40 °C process temperatures. Bring the module back to ambient operating temperature slowly (max. 3 °C/min).

Feed water

• Application: Standard seawater with low to moderate Total Suspended Solids (TSS) and/or organic load.
• Backwash Water Quality: Should be free of particulates and of UF permeate quality or better.

Product water

• Typical Permeate Quality:
  • SDI < 3
  • Turbidity < 0.1 NTU

Mechanical / hydraulic

• Element Dimensions:
  • Hydraulic membrane diameter: 0.8 mm [31 mil]
  • Membrane area: 40 m² [430 ft²]
  • Element length L₀: 1527.5 mm [60.14 Inch]
  • Permeate collector inner diameter d₀: 42.6 mm [1.68 Inch]
  • Element outer diameter D₀: 200 mm [7.9 Inch]
• Weight Specifications:
  • Dry weight: ca. 25 kg [55 lbs]
  • Membrane element filled with water: ca. 55 kg [121 lbs]
• Materials of Construction:
  • Housing: PVC grey
  • Flow distributor: PVC
  • Potting: PU resin
  • Membrane: PES/PVP

Chemical resistance

The membrane's resistance to solvents and cleaning chemicals strongly depends on actual process conditions. These indications are guidelines only.

General Solvent Resistance

• Acids: ++
• Bases: ++
• Aliphatic alcohols: +
• Aliphatic hydrocarbons: +
• Halogenated hydrocarbons: --
• Aromatic hydrocarbons: --
• Polar organic solvents: --
• Oils: ++

Cleaning Chemical Resistance

• Acids:
  • Hydrochloric Acid: ++
  • Nitric Acid: ++
  • Phosphoric Acid: ++
  • Acetic Acid: ++
  • Citric Acid: ++
  • pH > 2 during filtration
  • pH > 1 during cleaning
• Bases:
  • Sodium Hydroxide (<4%): ++
  • Potassium Hydroxide (<4%): ++
  • pH < 12 during filtration
  • pH < 13 during cleaning

Oxidant Resistance

Exposure limits are affected by temperature, pH, and the presence of metals. It is advised to reduce membrane exposure to oxidizing agents to a minimum. When the plant is stopped, membranes must be preserved free of any oxidizing agent.

• Sodium Hypochlorite (NaOCl):
  • Typical: 200 ppm, at ≤ 40 ºC at ≥ pH 10
  • Maximum: 500 ppm
  • Cumulative: 250,000 ppm hours; ≥ pH 10
• Chlorine Dioxide (ClO₂):
  • Typical: 1 ppm, at ≤ 40 ºC
  • Maximum: 2 ppm
  • Cumulative: 90,000 ppm hours
• Hydrogen Peroxide (H₂O₂):
  • Typical: 200 ppm, at ≤ 40 ºC
  • Maximum: 500 ppm
  • Cumulative: 350,000 ppm hours
• Combined Exposure (NaOCl + ClO₂):
  • Combined exposure (NaOCl + ClO₂) = (2.6 × Exposure to ClO₂ in ppm hours) + (Exposure to NaOCl in ppm hours) < 250,000 ppm hours

Storage

• New Modules: Store as supplied in original packaging. The elements contain an aqueous preservation solution of glycerine (20 wt%) and sodium metabisulfite (1 wt%).
• Storage Conditions: Dry, normally ventilated place, away from sources of heat, ignition, and direct sunlight. Store between 0 and 40 °C. Do not subject to freezing temperatures.
• Shelf Life: Maximum of 6 months for unused modules in unopened packaging under correct storage conditions.
• After Use: UF membrane modules need to be stored wet at all times.
  • Short-term shutdowns (1-7 days): A daily backwash with UF permeate quality water for 30 seconds at 250 lmh should be adequate for bacteria control. Before shutdown, modules must be cleaned by a standard Chemical Enhanced Backwash (CEB).
  • Long-term storage (>7 days): Membranes should be disinfected. Clean membranes using a CEB before disinfection. A 0.5% sodium metabisulfite solution can be used for disinfection. In both short and long-term storage, modules should remain filled with the storage solution.

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