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

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FSsmDairySFSeries_EN.doc Sep-13
Fact Sheet
Dairy SF Series
Dairy Processing – Lactose Concentration
The S-Series family of proprietary thin film reverse
osmosis membrane elements is characterized by a
high sodium chloride rejection and a smooth, foul-
ing-resistant membrane surface. The S-Series
membrane has an average rejection of 98.5% on
2,000ppm NaCl at 25°C (77°F) and 225psi operating
pressure.
The Diary SF elements provide high rejection of pro-
teins and low molecular weight organic constitu-
ents at operating pressures up to 600psi. These
elements are typically used for concentrating whey
and skim and cheese milk in food-related processes
requiring stringent sanitary procedures. Other ap-
plications may include lactose and sugar concen-
tration.
The Dairy SF elements feature a Durasan* Cage pa-
tented outer wrap, standard feed spacers and poly-
sulfone parts.
Table 1: Element Specification
Membrane S-Series, Thin Film Membrane (TFM*)
Model
Average
NaCl
rejection
Spacer
mil (mm)
Active area
ft 2 (m 2 )
Part
number
Dairy SF3840C30 98.5% 30 (0.76) 77 (7.2) 1207515
Dairy SF3840C50 98.5% 50 (1.27) 58 (5.4) 1207517
Figure 1: Element Dimensions Diagram 1
Table 2: Dimensions and Weight
Model 1
Dimensions, inches (cm) Boxed
A B 2 C
Weight
lbs (kg)
SF3840C 38.75
(98.4)
0.833
(2.12)
3.8
(9.6)
7
(3.2)
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 5-18 GFD (8-30 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 3.0-10.0
Recommended Pressure Drop Over an element: 12psi (83kPa)
Maximum Pressure Drop Over an element: 15psi (103kPa)
Per housing: 60psi (414kPa)
Chlorine Tolerance 500ppm-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