TFC 8923 S 400/ Softening / Low pressure

Summary

Product Identification

• Membrane Chemistry: Proprietary TFC polyamide
• Membrane Type: TFC-S membrane
• Construction: Spiral wound with fiberglass outerwrap
• Applications: Municipal water treatment when softening and THMFP (Trihalomethane Formation Potential) reduction
• Options: Available in 40” (1,106 mm) length with high area construction, or 60” (1,524 mm) Magnum® length.

Specifications

* Test Conditions: Mixed feed with 700 mg/L TDS (at least 45% monovalent), 80 psi (550 kPa) applied pressure, 15% recovery (20% recovery for Magnum elements), 77°F (25°C) and pH 7.5. ** Test Conditions: 1,000 mg/L MgSO₄ in deionized water, 80 psi (550 kPa) applied pressure, 15% recovery (20% recovery for Magnum elements), 77°F (25°C) and pH 7.5.

Nominal vs. Minimum Performance:

• Individual element permeate flows may vary +20% / -15% from nominal values.
• Minimum chloride ion rejection: 85%
• Minimum total hardness rejection: 94% (at mixed feed conditions)
• Minimum MgSO₄ rejection: 95% (at MgSO₄ conditions)

Operating Limits

• Typical Operating Pressure: 80 psi (552 kPa)
• Maximum Operating Pressure: 350 psi (2,410 kPa)
• Maximum Operating Temperature: 113°F (45°C)
• Maximum Cleaning Temperature: 113°F (45°C)
• Maximum Continuous Free Chlorine: <0.1 mg/L
• Allowable pH (continuous operation): 4 – 11
• Allowable pH (short-term cleaning): 2.5 – 11
• Maximum Differential Pressure per Element:
  • 40” (1,016 mm) long element: 10 psi (69 kPa)
  • 60” (1,524 mm) long element: 15 psi (104 kPa)
• Maximum Differential Pressure per Vessel: 60 psi (414 kPa)
• Permeate Pressure: Should not exceed feed-concentrate pressure by more than 5 psi (34 kPa) at any time.
• Maximum Feed Turbidity: 1 NTU (Feedwater >0.2 NTU generally leads to frequent cleanings)
• Maximum Feed SDI (15 minute test): 5.0
• Feed Spacer Thickness: 31/28 mil (0.8/0.7 mm)
• Recovery: Approximately 15% for 40” long elements and 20% for 60” long elements. Maximum recovery is site and application specific.

Chemical Tolerance

• Chlorine: Intentional exposure to free chlorine or other oxidizing agents (e.g., permanganate, ozone, bromine, iodine) is not recommended.
  • Free Chlorine Tolerance: Approximately 1,000 ppm-hours (at 77°F (25°C), pH 8). This tolerance can be reduced by catalyzing metals (e.g., iron) or different pH/temperature. Sodium metabisulfite is the preferred reducing agent.
  • Chloramine Tolerance: Approximately 60,000 ppm-hours in the absence of free chlorine (at 77°F (25°C), pH 8).
• Cationic (Positively Charged) Polymers and Surfactants: TFC-S membranes may be irreversibly fouled; exposure during operation or cleaning is not recommended.

Product Dimensions and Weight

Lubricants

For element loading, use only approved silicone lubricant (or equivalent), water, or glycerin for O-rings and brine seals. Petroleum-based or vegetable-based oils may damage the element and void the warranty.

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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