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

Fact Sheet
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FSsmDairyDLSeries_EN.doc Nov-13
Dairy DL Series
Dairy Processing Sanitary Nanofiltration
The D-Series family of proprietary thin-film nanofil-
tration membrane elements is characterized by an
approximate molecular weight cut-off of 150-300
Dalton for uncharged organic molecules. Divalent
and multivalent anions are preferentially rejected
by the membrane while monovalent ion rejection is
dependent upon feed concentration and composi-
tion. Since monovalent ions pass through the mem-
brane, they do not contribute to the osmotic
pressure, thus enabling D-Series nanofiltration
membrane systems to operate at feed pressures
below those of RO systems.
The DL membrane has a minimum rejection of 96%
on 2,000ppm MgSO
4
at 25°C and 110psi operating
pressure.
The Dairy Processing DL Elements are typically used
in food related processes requiring stringent sani-
tary procedures. Applications include lactose de-
salting, deacidification and demineralization of
whey or UF permeate.
These elements feature a Durasan* Cage patented
outer wrap, a selection of feed spacers, and polysul-
fone parts.
Table 1: Element Specification
Membrane D-Series, Thin Film Membrane (TFM*)
Model
Spacer
mil (mm)
Active area
ft 2 (m 2 )
Part
number
Dairy DL3840C30 30 (0.76) 77 (7.2) 1207023
Dairy DL8038C30 30 (0.76) 380 (35.3) 1244333
Figure 1: Element Dimensions Diagram
Table 2: Dimensions and Weight
Model 1
Dimensions, inches (cm) Boxed
A B 2 C
Weight
lbs (kg)
DL3840C30 38.75
(98.4)
0.833
(2.12)
3.79
(9.6)
7
(3.2)
DL8038C30 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.
Table 3: Operating parameters
Typical Operating Pressure 70-400psi (483-2,757kPa)
Typical Operating Flux 5-20 GFD (8-34 LMH)
Clean Water Flux (CWF) 1 18 GFD (30 LMH) @ 110psi
Maximum Operating Pressure 600psi (4,137kPa)
Maximum Temperature 122°F (50°C)
pH Range 3.0-9.0
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%.
Table 4: CIP limits for NF elements
Temperature ‘ pH minimum ‘ pH maximum
50°C (122°F) 3.0 10.0
45°C (113°F) 2.0 10.5
35°C (95°F) 1.5 11.5
25°C (77°F) 1.0 11.5