X-Flow-Seaguard-55

Summary

Product identification

The Pentair X-Flow Seaguard 55 is an ultrafiltration membrane element (Article Code: 23F2FL395A) designed for pretreatment in seawater reverse osmosis systems. It is suitable for standard seawater applications with low to moderate Total Suspended Solids (TSS) and/or organic load. The mode of operation is dead-end with regular backwash (permeate only) and chemically enhanced backwash.

The membrane is hydrophilic, composed of a blend of polyvinylpyrrolidone and polyethersulfone (PES/PVP), with an asymmetric/microporous structure. It features a nominal pore size of 20 nm, high performance, and very good anti-fouling behavior.

Operating limits

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

Oxidant Contact Limits: (These figures represent membrane resistance to each individual oxidizing agent. Exposure limits are also affected by temperature, pH, and presence of metals. Reduce exposure to a minimum to maximize membrane lifetime.)

• 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
• 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

Feed water

The Seaguard 55 is used in applications for standard seawater with low to moderate TSS and/or organic load.

Product water

• Typical permeate quality: SDI<3, turbidity <0.1 NTU.
• Backwash water should be free of particulates and of UF permeate quality or better.

Mechanical / hydraulic

Element Specifications:

• Membrane Diameter: 0.8 mm [31 mil]
• Membrane area: 55 m² [590 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

General Solvent Resistance (Guideline):

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

Cleaning Chemical Resistance:

• Hydrochloric Acid: ++
• Nitric Acid: ++
• Sulphuric Acid: ++
• Phosphoric Acid: ++
• Acetic Acid: ++
• Citric Acid: ++
• Sodium Hydroxide (<4%): ++
• Potassium Hydroxide (<4%): ++

Operational Notes:

• Backwash pumps should preferably be made of non-corroding materials (e.g., plastic or stainless steel).
• If compressed air is used for backwash, do not allow a two-phase air/water mixture to enter the element.
• Avoid sudden temperature changes, especially decreases. Do not exceed 40 °C process temperature. Bring module to ambient operating temperature slowly (max. 3 °C/min) to prevent irreparable damage.

Storage

• New membrane modules are supplied with an aqueous preservation solution of glycerine (20wt%) and sodium metabisulfite (1wt%).
• Store in a dry, normally ventilated place, away from heat sources, ignition, and direct sunlight.
• Storage temperature: 0 to 40 °C.
• Do not subject modules to freezing temperatures.
• Shelf life for unused modules in unopened packaging under correct storage conditions is a maximum of 6 months.
• After use, UF membrane modules must 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. Modules must be cleaned by a standard Chemical Enhanced Backwash (CEB) before the shutdown period.
• Long-term storage (> 7 days): Membranes should be disinfected after a CEB cleaning. A 0.5% sodium metabisulfite solution can be used for disinfection. Modules should remain filled with the storage solution.

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Disclaimer: This summary is based on the provided text extract 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