X-Flow-Seaflex-64

Summary

Product identification

The X-FLOW SEAFLEX 64 (also referred to as SEAFLEX HP) is an ultrafiltration membrane module identified by Article Code: 22F1FL895H. It is designed for use as a pre-treatment for seawater reverse osmosis applications, specifically for standard seawater with low to moderate Total Suspended Solids (TSS) and/or organic load.

Its mode of operation can be feed-and-bleed with a minor crossflow or dead-end with regular backwash (permeate only) and chemically enhanced backwash.

Operating limits

• Max. system pressure: 300 kPa [43 psi]
• Max. trans-membrane pressure: 300 kPa [43 psi]
• Max. backflush pressure: 300 kPa [43 psi]
• Temperature range: 0-40 °C [32-104 °F]
• pH during filtration:
  • Acids: > 2
  • Bases: < 12
• pH during cleaning:
  • Acids: > 1
  • Bases: < 13

Feed water

Backwash water should be free of particulates and should be of UF permeate quality or better.

Product water

• Typical permeate quality: SDI<3, turbidity <0.1 NTU

Mechanical / hydraulic

• Element Specifications:
  • Membrane diameter: 0.83 mm [32.7 mil]
  • Effective membrane area: 64 m² [687 ft²]
  • Feed connection D0: 220.0 mm [8.66 Inch]
  • Module length L0: 1537.5 mm [60.51 Inch]
  • Permeate connection d0: 42.6 mm [1.68 Inch]
• Weight Specifications:
  • Dry weight of membrane element: ca. 34 kg [75 lbs]
  • Membrane element filled with water: ca. 66 kg [145 lbs]
• Materials of Construction:
  • Housing: PVC grey
  • Flow distributor: PVC/PP
  • Potting: PU resin
  • Membrane: PES/PVP
• Process Characteristics (Water, 20 °C):
  • Hydraulic membrane diameter: 0.83 mm [32.7 mil]
  • Crossflow flow rate: 26.9*v m³/h [36*v gpm] (where v = superficial velocity in m/s [ft/s])
  • Pressure-drop across module at 1 m/s: 64 kPa [9 psi]
  • Pressure-drop across module at 2 m/s: 136 kPa [20 psi]

Membrane characteristics

• Hydrophilic membrane composed of a blend of polyvinylpyrrolidone and polyethersulfone.
• Nominal pore size: 20 nm
• Structure: asymmetric/microporous
• High performance and very good anti-fouling behavior.

Chemical resistance

The resistance to solvents and cleaning agents are guidelines and depend on actual process conditions.

• General Solvent Resistance:
  • Acids: ++
  • Bases: ++
  • Oils: ++
  • Aliphatic alcohols: +
  • Aliphatic hydrocarbons: +
  • Organic esters, ketones, ethers: -
  • Halogenated hydrocarbons: --
  • Aromatic hydrocarbons: --
  • Polar organic solvents: --
• Cleaning Chemical Resistance:
  • Acids:
    • Hydrochloric Acid: ++
    • Nitric Acid: ++
    • Sulphuric Acid: ++
    • Phosphoric Acid: ++
    • Acetic Acid: ++
    • Citric Acid: ++
  • Bases:
    • Sodium Hydroxide (<4%): ++
    • Potassium Hydroxide (<4%): ++
• Oxidizing Agents:
  • Sodium Hypochlorite (NaOCl):
    • Typical: 200 ppm, at ≤ 40 °C, at ≥ pH 10
    • Maximum: 500 ppm
    • Cumulative: 250,000 ppm hours; ≥ pH 10
  • Chlorine Dioxide (ClO₂):
    • Typical: 1 ppm, at ≤ 40 °C
    • Maximum: 2 ppm
    • Cumulative: 90,000 ppm hours; pH 11
  • Hydrogen Peroxide (H₂O₂):
    • Typical: 200 ppm, at ≤ 40 °C
    • Maximum: 500 ppm
    • Cumulative: 350,000 ppm hours
  • Combined Exposure (NaOCl + ClO₂):
    • 2.6 x Exposure to ClO₂ (in ppm hours) + Exposure to NaOCl (in ppm hours) < 250,000 ppm hours
  • Note: Exposure limits are affected by temperature, pH, and the presence of metals. Minimize exposure to oxidizing agents and preserve membranes free of any oxidizing agent when the plant is stopped.

Storage

• New membrane modules:
  • Contain an aqueous preservation solution of glycerine (20wt%) and sodium metabisulfite (1wt%).
  • Store in a 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 6 months for unused modules in unopened packaging under correct storage conditions after transfer of ownership.
• After use:
  • UF membrane modules must be stored wet at all times.
  • To avoid biological growth, treat with a compatible biocide.
  • Short-term shutdowns (1–7 days): A daily backwash for 30 seconds at 240 lmh with UF permeate quality water should be adequate for bacteria control. Modules must be cleaned by a standard Chemical Enhanced Backwash (CEB) before the shutdown period.
  • Long-term storage (> 7 days): Membranes should be cleaned 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 storage 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