GE P&W Spiral Wound Membranes - Dairy AF Series - Manual

Fact Sheet
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FSsmDairyAFSeries_EN.doc Nov-13
Dairy AF Series
Dairy Processing – Lactose Concentration
The A-Series family of proprietary thin film reverse osmo-
sis membrane elements is characterized by high flux and
excellent sodium chloride rejection. The A-Series mem-
brane has an average rejection of 99.5% on 2,000ppm
NaCl at 25°C (77°F) and 225psi operating pressure.
The Dairy AF elements provide high rejection of dissolved
solids and low molecular weight organic constituents at
operating pressures up to 600psi. These elements are
designed for processing streams previously treated by
ultrafiltration and are typically used in applications
where the concentrate is used for animal feed. Applica-
tions include whey and milk protein concentration and
lactose recovery.
The Dairy AF elements feature a Durasan* Cage patent-
ed outer wrap, standard feed spacers and polysulfone
parts. These elements comply with the USDA guidelines
for the sanitary design and fabrication of dairy pro-
cessing equipment or applicable 3-A sanitary standards.
Table 1: Element Specification
Membrane A-Series, Thin Film Membrane (TFM*)
Model
Spacer
mil (mm)
Active area
ft 2 (m 2 )
Part
number
Dairy AF3838C30 30 (0.76) 83 (7.7) 1206647
Dairy AF3838C50 50 (1.27) 52 (4.8) 1255669
Dairy AF3840C30 30 (0.76) 85 (7.9) 1206648
Dairy AF3840C50 50 (1.27) 57 (5.3) 1255063
Dairy AF8038C30 30 (0.76) 390 (36.2) 1221893
Dairy AF8038C50 50 (1.27) 290 (26.9) 1227202
Figure 1: Element Dimensions Diagram
Table 2: Dimensions and Weight
Model 1
Dimensions, inches (cm) Boxed
A B 2 C
Weight
lbs (kg)
AF3838C 38.00
(96.5)
0.833
(2.12)
3.8
(9.6)
7
(3.2)
AF3840C 38.75
(98.4)
0.833
(2.12)
3.8
(9.6)
7
(3.2)
AF8038C 38.00
(96.5)
1.125
(2.86)
7.91
(20.1)
29
(13.2)
1 These elements are dried and bagged before shipping.
2 Internal diameter.
3 The element diameter (dimension C) is designed for optimum performance in GE
Water & Process Technologies pressure vessels. Others pressure vessel dimension
and tolerance may result in excessive bypass and loss of capacity.
Table 3: Operating parameters
Typical Operating Pressure 200-500psi (1,379-3,447kPa)
Typical Operating Flux 5-20 GFD (8-34 LMH)
Clean Water Flux (CWF) 1 14 GFD (24 LMH) @ 225psi
Maximum Operating Pressure 600psi (4,137kPa)
Maximum Permeate Pressure 2 60 psi (413 kPa)
Maximum Temperature 122°F (50°C)
pH Range 2.0-11.0
Recommended Pressure Drop Over an element: 12psi (83kPa)
Maximum Pressure Drop Over an element: 15psi (103kPa)
Per housing: 60psi (414kPa)
Chlorine Tolerance 1000ppm-hours
dechlorination recommended
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%.
2 Permeate pressure should never exceed the concentrate pressure.
Table 4: CIP limits for RO elements
Temperature ‘ pH minimum ‘ pH maximum
50°C (122°F) 2.0 11.5
45°C (113°F) 1.5 11.5
35°C (95°F) 1.5 11.5
25°C (77°F) 1.0 12.0