TFC 8933 S 575 Magnum / Softening / Low pressure

Summary

Product identification

The TFC®-S 8” Element is a spiral-wound reverse osmosis (RO) element designed for softening and low-pressure applications.

• Membrane Chemistry: Proprietary TFC polyamide
• Membrane Type: TFC-S membrane
• Construction: Spiral wound with fiberglass outerwrap
• Applications: Municipal water treatment, specifically for 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.

Model TFC 8933 S-575 Magnum® (Part Number: 8893300)

• Nominal Permeate Flow: 12,500 gpd (47.3 m³/d)
• Nominal Rejection:
  • Chloride: 85%
  • Total Hardness: 98.5%
  • MgSO₄: 99%
• Membrane Area: 575 ft² (53.4 m²)

Test Conditions (for 8933 S-575 Magnum®):

• For Chloride and Total Hardness rejection:
  • Mixed feed: 700 mg/L TDS (at least 45% monovalent)
  • Applied Pressure: 80 psi (550 kPa)
  • Recovery: 20%
  • Temperature: 77°F (25°C)
  • pH: 7.5
• For MgSO₄ rejection:
  • Feed: 1,000 mg/L MgSO₄ in deionized water
  • Applied Pressure: 80 psi (550 kPa)
  • Recovery: 20%
  • Temperature: 77°F (25°C)
  • pH: 7.5

Performance Details

• Individual element permeate flows may vary +20%/-15% from nominal values.
• Minimum Rejection:
  • Chloride ion: 85% (at mixed feed conditions)
  • Total Hardness: 94% (at mixed feed conditions)
  • MgSO₄: 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: 15 psi (104 kPa) for a 60” element
• 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.
• Recovery (single element): Approximately 20% for 60” long elements.

Feed water

• Maximum Feed Turbidity: 1 NTU (Experience suggests frequent cleanings if turbidity > 0.2 NTU)
• Maximum Feed Silt Density Index (SDI): 5 (15 minute test)

Chemical Tolerance

• Chlorine/Oxidizing Agents: 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).
  • Chloramine Tolerance: Approximately 60,000 ppm-hours (in absence of free chlorine, at 77°F / 25°C, pH 8).
  • Note: Tolerance may be significantly reduced by catalyzing metals (e.g., iron) or different pH/temperature. Sodium metabisulfite (without catalysts like cobalt) is the preferred reducing agent.
• Cationic (Positively Charged) Polymers and Surfactants: Exposure may cause irreversible fouling and is not recommended during operation or cleaning.

Mechanical / hydraulic

• Feed Spacer Thickness: 31/28 mil (0.8/0.7 mm)

Dimensions and Weight (for 8933 S-575 Magnum®)

• Length (A): 60 inches (1,524 mm)
• Diameter (B): 8 inches (203.2 mm)
• Center Tube I.D. (C): 1.5 inches (38.1 mm)
• Weight: 64 lbs (29 kg)

Ancillary Part Numbers

• Interconnector: 0035270
• O-ring: 0035478
• Brine Seal: 0035705

Lubricants for Element Loading

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

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Disclaimer: This summary is based on the extracted text and may not include all figures, footnotes, or revisions present in the original OEM PDF datasheet. For contractual data, always refer to the specific OEM PDF revision used on your project.

Official datasheet (PDF)

PDF datasheet