GE P&W Dairy DL Series User Manual

Fact Sheet

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FSsmDairyDLSeries_EN.doc Nov-13

Membrane

D-Series, Thin Film Membrane (TFM*)

Model

Spacer

mil (mm)

Active area

ft2 (m2)

Part

number

Dairy DL3840C30

30 (0.76)

77 (7.2)

1207023

Dairy DL8038C30

30 (0.76)

380 (35.3)

1244333

Model1

Dimensions, inches (cm)

Boxed

A

B2

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)

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

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

Dairy DL Series

Dairy Processing Sanitary Nanofiltration

The D-Series family of proprietary thin-film nanofil­tration 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 composi­tion. Since monovalent ions pass through the mem­brane, 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 MgSO4 at 25°C and 110psi operating
pressure.

The Dairy Processing DL Elements are typically used
in food related processes requiring stringent sani­tary procedures. Applications include lactose de­salting, deacidification and demineralization of
whey or UF permeate.

Figure 1: Element Dimensions Diagram

Table 2: Dimensions and Weight

1

These elements are dried and bagged before shipping.

2

Internal diameter.

Table 3: Operating parameters

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

Table 1: Element Specification

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