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GE P&W Spiral Wound Membranes - CK Series User Manual

Ck series, Water softening nf elements (cellulose acetate), Fact sheet

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Fact Sheet

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©2013, General Electric Company. All rights reserved.

FS1268EN.doc Nov-13



CK Series

Water Softening NF Elements (Cellulose Acetate)

The C-Series family, a triacetate/diacetate blend,
has a higher flux and better mechanical stability
than standard cellulose acetate. C-Series elements
offer an increased chlorine resistance compared to
thin-film elements.
CK Nanofiltration Elements are used for water sof-
tening, color removal, and reduction of THM poten-
tial when chlorine is required.

Table 1: Element Specification

Membrane

C-series , cellulose acetate

Model

Average

permeate flow

gpd (m3/day)

1,2

Average MgSO

4

rejection

1,2

Minimum MgSO

4

rejection

1,2

CK8040F

9,000 (34.1)

97.0%

94.0%

1

Average salt rejection after 24 hours operation. Individual flow rate may vary

+25%/-15%.

² Testing conditions: 2,000ppm MgSO

4

solution at 225psi (1,551kPa) operating

pressure, 77°F, pH 6.5 and 15% recovery.

Model

Active area

ft

2

(m

2

)

Outer wrap

Part

number

CK8040F

365 (33.9)

Fiberglass

1233927



Figure 1: Element Dimensions Diagram - Female

Table 2: Dimensions and Weight

Model²

Dimensions, inches (cm)

Boxed

A

B

1

C

3

Weight

lbs (kg)

CK8040F

40.0

(101.6)

1.125

(2.86)

7.9

(20.1)

32

(14.5)

1

Internal diameter unless specified OD (outside diameter).

² These elements are dried then bagged before shipping.

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 and CIP parameters

Typical Operating Pressure

60-200 psi (414 - 1,379 kPa)

Typical Operating Flux

10-18 GFD (17-30 LMH)

Maximum Operating Pressure

450 psi (3,103 kPa)

Maximum Temperature

Continuous operation: 86°F (30°C)
Clean In Place (CIP): 86°F (30°C)

pH Range

Continuous operation: 5.0-6.5,
Clean In Place (CIP): 3.0-8.0

Maximum Pressure Drop

Over an element: 12 psi (83 kPa)
Per housing: 50 psi (345 kPa)

Chlorine Tolerance

1ppm maximum continuous
30ppm for 30 min. during sanitization

Feedwater

NTU < 1
SDI < 5