Dairy PW Series


Ultrafiltration – Protein Concentration

The Dairy PW Series family of polyethersulfone ultrafiltration membrane elements are characterized by a 20,000 molecular weight cut-off. Dairy PW Elements are typically used for protein concentrate up to 20% either from milk and sweet whey (not suitable for acid whey).

These elements feature a Durasan* Cage patented outer wrap, a selection of feed spacers, and polysulfone parts.

The Dairy PW elements comply with:

  • FDA Regulations relevant sections of 21CFR
  • EU Framework 1935/2004/EC

Table 1: Element Specification

Membrane P-Series, Polyethersulfone

Model Spacer mil(mm) Active area ft2 (m2) Outer wrap Part Number
DAIRY PW3838C30 30 (0.76) 69 (6.4) Cage 1228024
DAIRY PW3838C50 50 (1.27) 55 (5.1) Cage 1229303
DAIRY PW6338C30 30 (0.76) 217 (20.2) Cage 1207392
DAIRY PW6338C50 50 (1.27) 168 (15.6) Cage 1207393
DAIRY PW6338C65 65 (1.65) 129 (12.0) Cage 1223985
DAIRY PW8038C30 30 (0.76) 345 (32.0) Cage 1230789
DAIRY PW8038C50 50 (1.27) 263 (24.4) Cage 1230680
Figure 1: Element Dimensions Diagram

Table 2: Dimensions and Weight

Model A B C Boxed Weight lbs (kg)
DAIRY PW3838 38.0 (96.5) 0.833 (2.12) 3.79 (9.6) 7 (3.2)
DAIRY PW5838 38.0 (96.5) 1.138 (2.89) 5.71 (14.5) 18 (8.2)
DAIRY PW6338 38.0 (96.5) 1.138 (2.89) 6.34 (16.1) 18 (8.2)
DAIRY PW8038 38.0 (96.5) 1.125 (2.86) 7.91 (20.1) 29 (13.2)
  1. These elements are bagged dry before shipping.
  2. Internal diameter unless specified OD (outside diameter).
  3. The element diameter (dimension C) is designed for optimum performance in GE pressure vessels. Other pressure vessel dimension and tolerance may result in excessive bypass and loss of capacity.

Table 3: Operating and CIP parameters

Typical Operating Pressure 80-135 psig (555 – 931 kPa)
Typical Operating Flux 10-25GFD (15-40LMH)
Clean Water Flux (CWF)1 59GFD (100LMH) @ 30psi and 50°C
Maximum Temperature Continuous operation: 122°F (50°C)
Clean In Place (CIP): 122°F (50°C)
pH Range Continuous operation: 2.0-10.0
Clean In Place (CIP): 2.0-11.5
Maximum Pressure Drop Over an element: 12 psig (83 kPa)
Per housing: 50 psig (345 kPa)
Chlorine Tolerance 5,000+ ppm-days

1. Clean water flux (CWF) is the rate of water permeability through the membrane after cleaning (CIP) at reproducible temperature and pressure. It is important to monitor CWF after each cleaning cycle to determine if the system is being cleaned effectively. CWF can vary ± 25%.

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