GE P&W Duratherm EXL Series User Manual

Fact Sheet

Duratherm* EXL Series

Industrial High Temperature Elements

Description and Use

The Duratherm* EXL Series includes RO and NF
membrane elements. These Series is specifically
designed to maximize the benefits of hot water san­itization for industries relying on chemical-free sani­tization for product quality and/or industry
compliance standards.

The separation system sanitization protocol is per­formed via periodic exposure to temperature as
high as 90°C (194°F) at minimum feed pressure to
kill microorganisms by denaturation and coagula­tion of the proteins chains.

The Duratherm EXL elements are also suitable for
separation systems at temperature up to 70°C
(158°F).

All element constructions include polysulfone ATD &
central tube and a patented Durasan* cage outer
wrap.

Features and benefits

• Prevent bio-fouling development

• No disposal costs

• 100% wet testing Quality Assurance

• Durable construction

• Sanitization on the permeate side

Table 1: Element Specification

Membrane Thin-film membrane (TFM*)

Model

Duratherm EXL RO2540HR 8 (1.8) Figure 2

Duratherm EXL RO8040HR 100 (22.7) Figure 7 Figure 2

Duratherm EXL NF2540HR 8 (1.8) Figure 3, 4 & 5

Duratherm EXL NF4040HR 40 (9.1) Figure 6 Figure 3, 4 & 5

Duratherm EXL NF4040 40 (9.1) Figure 6 Figure 3,4 & 5

Duratherm EXL NF8040HR 100 (22.7) Figure 7 Figure 3, 4 & 5

Duratherm EXL NF8040 100 (22.7) Figure 7 Figure 3, 4 & 5

Duratherm EXL UF2 8040 NA NA 2,500 MWCO

Maximum

crossflow gpm

(m3/hr)

Recommend-

ed crossflow

Salt rejection

Model

Duratherm EXL RO2540HR 50 (1.27) 19 (4.3) 1228306

Duratherm EXL RO8040HR 50 (1.27) 282 (26.2) 1228840

Duratherm EXL NF2540HR 50 (1.27) 19 (4.3) 1206922

Duratherm EXL NF4040HR 50 (1.27) 67 (6.2) 1206950

Duratherm EXL NF4040 50 (1.27) 67 (6.2) 1207032

Duratherm EXL NF8040HR 50 (1.27) 282 (26.42) 1206982

Duratherm EXL NF8040 50 (1.27) 282 (26.2) 1207045

Duratherm EXL UF2 8040 50 (1.27) 295 (27.4) 3002290

Spacer mil

(mm)

Active area

ft2 (m2)

Part

number

Markets

• Food / Beverage

• BioPharm

• Electronics

•

Chemical

Table 2: Maximum Pressure Drops

Range

Over an element 15 (103) 7 (48)

Per housing 60 (414) 30 (207)

0°C-50°C

psig (kPa)

51°C-70°C

psig (kPa)

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* Trademark of General Electric Company; may be registered in one or more countries.

©2014, General Electric Company. All rights reserved.

AM-FSpwDurathermExcel_EN.doc Jan-14

Figure 1A: Element Dimensions Diagram – Female

Figure 1B: Element Dimensions Diagram – Male

Table 3: Dimensions and Weight

Dimensions, inches (cm) Boxed

Model²

XX 2540

XX 4040

XX 8040

1

Internal diameter.

² These elements are dried then bagged before shipping.

3

The element diameter (dimension C) is designed for optimum performance in GE
pressure vessels. Others pressure vessel dimension and tolerance may result in
excessive bypass and loss of capacity.

A B1 C3

40.0

(101.6)

40.0

(101.6)

40.0

(101.6)

0.75

(1.91)

0.625
(1.59)

1.125
(2.86)

2.43

(6.17)

3.9

(9.9)

7.9

(20.1)

Table 4: Operating and CIP parameters

Do not exceed 20 GFD (33 LMH) or 2,000 Wagner units
under any circumstance.

Typical Operating Pressure Figures 9 & 10

Maximum Operating Pressure 1,200 psi (8,273 kPa)

600 psi (4,137 kPa)
400 psi (2,758 kPa)
Hot Water Sanitizing

Maximum Temperature Continuous Operation: 177°F (70°C)

Clean-In-Place (CIP): 104°F (40°C)
Hot Water Sanitizing: 194°F (90°C)

pH range Continuous Operation: 3 – 9

clean-In- Place (CIP): 2 – 10.5

Chlorine Tolerance 500 ppm hours

dechlorination recommended

Feedwater NTU < 1

SDI < 5

32 – 77°F (0 – 25°C)
78 – 122°F (26 – 50°C)
123 – 158°F (51 – 70°C)
158 – 194°F (70 – 90°C)

Weight
lbs (kg)

4

(1.8)

9

(4.1)

29

(13.2)

Hot Water Sanitization
Recommendations

For optimal performance, Duratherm EXL elements
should always be cleaned using approved CIP pro­cedures and flushed with fouling free water before
the sanitization process. Feed pressure during sani­tization should not exceed 40psi (275kPa) and the
crossflow should not incur a pressure drop greater
than 2psi (14kPa) per element. Heating rate to sani­tizing temperature and cool down should not be
faster than 5°C (9ºF)/minute. Maximum sanitization
temperature is 90°C (194ºF).

Loss of permeate flow after repeated
90ºC (194ºF) sanitization cycles

It is almost impossible to exactly predict the per­centage of permeate flow rate lost from the high
temperature sanitations, which among other fac­tors depends on:

• The rate of temperature increase and decrease.

• The presence of other species like organics, ion-

ic and metallic compounds that could locally
decrease or increase the temperature at the
surface of the membrane.

• The feed flow rate and specifically the heat

transfer rate to the membrane surface.

• The thickness and geometry of the feed spacer

used.

At optimum conditions measured in controlled envi­ronment with deionized water, between 30% and
50% of the original permeate flow rate was lost be­fore the element performance had stabilized after
repeated heat treatments (over 90% of this flow
reduction occurred during the first heat treatment).
With the loss of permeate flow rate, the salt rejec­tion increases. The rate of cooling and heating was
not more than 5°C (9ºF) per minute, and the differ­ential pressure drop per element did not exceed 2
psi.

Pilot testing based on the criteria noted above will
give the best operating parameters for any specific
application.

Page 2 Fact Sheet