Dairy-UF XL 3838 HFK-131-NYV

Summary

Product identification

Koch Membrane Systems XL-1000 FOOD & DAIRY UF ELEMENTS are ultrafiltration (UF) spiral elements available in 4”, 6”, and 8” diameters, featuring patented Fused-Fold Protection.

• Membrane Chemistry: Proprietary semi-permeable polyethersulfone (PES)
• Membrane Type:
  • HFK-131 with observed separation range of 10,000 Daltons
  • HFK-328 with observed separation range of 5,000 Daltons
• Construction: Sanitary spiral wound with net outer wrap and patented fused-fold protection.
• Regulatory Status: Compliant with US FDA CFR Title 21, USDA 3-A standards, EC Reg. No. 1935/2004, and EU Reg. No. 10/2011. Elements are Halal-certified by the Islamic Food and Nutrition Council of America (IFANCA).
• Options:
  • Diameter: 3.8”, 4.3”, 6.4”, or 8.3”
  • Length: 33”, 35.5”, or 38”
  • Feed Spacer: N (31 mil), V (46 mil), H (62 mil), or F (80 mil)
  • Outer wrap: Controlled (e.g., NYV) or trimmable (e.g., NYT)

Specifications

The elements feature a semipermeable polyethersulfone (PES) layer on a polyester backing material. Pure water flux for these PES HFK membranes is 1.0-2.2 gfd/psi (24-53 l/m²/h/bar) at 77°F (25°C).

Active Membrane Area for XL 3838 HFK-131:

• NYV/T Spacer (31 mil): 72 ft² (6.7 m²)
• VYV/T Spacer (46 mil): 58 ft² (5.4 m²)
• HYV/T Spacer (62 mil): 45 ft² (4.2 m²)
• FYV/T Spacer (80 mil): Not available

Operating limits

• Typical Operating Pressure: 30 - 120 psi (2.1 - 8.3 bar)
• Maximum Operating Pressure: 140 psi (9.7 bar)
• Operating Temperature Range: 41 - 131°F (5 - 55°C)
• Cleaning Temperature Range: 105 - 122°F (40 - 50°C)
• Allowable pH - Continuous Operation: 2.0 - 10.0
• Allowable pH - Clean-In-Place (CIP): 1.8 - 11.0
• Permeate Pressure: Should not exceed baseline (concentrate) pressure at any time (including online, off-line, and during transition). Reverse pressure will damage the membrane.
• Design Pressure Drop Per Element:
  • N spacer: 12-15 psi (0.8-1.0 bar)
  • V spacer: 15-20 psi (1.0-1.4 bar)
  • H or F spacer: 15-25 psi (1.0-1.7 bar)
• Design Pressure Drop Per Vessel (3 in series):
  • N spacer: 36-45 psi (2.5-3.1 bar)
  • V spacer: 45-60 psi (3.1-4.1 bar)
  • H or F spacer: 45-75 psi (3.1-5.2 bar)
• Design Pressure Drop Per Vessel (4 in series):
  • N spacer: 48-60 psi (3.3-4.1 bar)
  • V spacer: 60-68 psi (4.1-4.7 bar)

Feed water

• Maximum feed turbidity: 1 NTU
• Maximum feed SDI: 5.0 (15-minute test)

Mechanical / hydraulic

Nominal Dimensions (Length A, Diameter B, Core Tube Diameter C):

• XL-1000 3838 HFK-xxx: 38.0 inches (965 mm) A, 3.8 inches (96 mm) B, 0.831 inches (21.1 mm) C
• XL-1000 4333 HFK-xxx: 33.0 inches (838 mm) A, 4.3 inches (109 mm) B, 0.831 inches (21.1 mm) C
• XL-1000 4336 HFK-xxx: 35.5 inches (902 mm) A, 4.3 inches (109 mm) B, 0.831 inches (21.1 mm) C
• XL-1000 6438 HFK-xxx: 38.0 inches (965 mm) A, 6.4 inches (162 mm) B, 1.138 inches (28.9 mm) C
• XL-1000 8338 HFK-xxx: 38.0 inches (965 mm) A, 8.3 inches (211 mm) B, 1.138 inches (28.9 mm) C

Note: 'xxx' refers to 131 or 328 membrane type.

Cleaning and Chemical Exposure

• Recommended chlorine exposure time: 30 minutes per day.
• Residual chlorine concentration during CIP: 150 ppm @ pH 10.5 or higher.
• Maximum chlorine concentration: Should never exceed 200 ppm.
• Chlorine should only be added to the cleaning solution after the pH has been adjusted to 10.5 or higher.
• Avoid: Iron or other catalyzing metals in the presence of free chlorine or hydrogen peroxide, as they will accelerate membrane degradation.
• Cationic Polymers and Surfactants: HFK membranes may be irreversibly fouled if exposed to cationic (positively charged) polymers or surfactants. Exposure to these chemicals is not recommended and will void the warranty.
• Lubricants: For element installation, use only water or glycerin to lubricate seals. The use of petroleum or vegetable-based oils or solvents may damage the element and will void the warranty.

---

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

Official datasheet (PDF)

PDF datasheet