AK Series


Low Energy Brackish Water RO Elements

GE Power Water & Process Technologies

The A-Series, family of proprietary thin-film reverse osmosis membrane elements are characterized by high flux and high sodium chloride rejection. AK Low Pressure Brackish Water Elements are selected when high rejection and low operating pressures are desired. These elements allow significant energy savings since good rejection is achieved at operating pressures as low as 100 psi (689 kPa).

Table 1: Element Specification

Membrane A-series, thin-film membrane (TFM*)

Model Average permeate flow gpd (m3/day)1,2 Average NaCl rejection1,2 Minimum NaCl rejection1,2
AK2540TM 750 (2.8) 99.0% 98.0%
AK4040C 2,600 (9.8) 99.0% 98.0%
AK4040FM 2,300 (8.7) 99.0% 98.0%
AK4040TM 2,300 (8.7) 99.0% 98.0%
AK8040C 10,400 (39.4) 99.0% 98.0%
AK8040F 10,000 (37.9) 99.0% 98.0%
AK8040F 400 11,000(41.6) 99.0% 98.0%

1 Average salt rejection after 24 hours operation. Individual flow rate may vary +/-20%.
2 Testing conditions: 500ppm NaCl solution at 115psi (793kPa) operating pressure, 77°F (25°C), pH7.5 and 15% recovery.

Model Membrane area ft2 (m2) Outer wrap Part Number
AK2540TM 27 (2.5) Tape 1206802
AK4040C 90 (8.4) Cage* 1223696
AK4040FM 85 (7.9) Fiberglass 3039082
AK4040TM 85 (7.9) Tape 3039149
AK8040C 380 (35.3) Cage* 1206819
AK8040F 365 (33.9) Fiberglass 3039160
AK8040F 400 400 (37.2) Fiberglass 3039161
Figure 1a: Element Dimensions Diagram – Male
Figure 1b: Element Dimensions Diagram – Female

Table 2: Dimensions and Weight

A, B1, C3 Dimensions, Inches (cm)

Model Type A B1 C3 Boxed Weight lbs (kg)
AK2540TM Male 40.0 (101.6) 0.75 (1.9) 2.4 (6.1) 5 (2.3)
AK4040C Female 40.0 (101.6) 0.625 (1.59) 3.9 (9.9) 9 (4)
AK4040FM Male 40.0 (101.6) 0.75 (1.9) 3.9 (9.9) 9 (4)
AK4040TM Male 40.0 (101.6) 0.75 (1.9) 3.9 (9.9) 9 (4)
AK8040C Female 40.0 (101.6) 1.125 (2.86) 7.9 (20.1) 35 (16)
AK8040F Female 40.0 (101.6) 1.125 (2.86) 7.9 (20.1) 35 (16)
AK8040F 400 Female 40.0 (101.6) 1.125 (2.86) 7.9 (20.1) 35 (16)

Table 3: Operating and CIP parameters

Typical Operating Pressure 100 psi (689 kPa)
Typical Operating Flux 10-20 GFD (15-35LMH
Maximum Operating Pressure 400 psi (2,756 kPa)
Maximum Temperature Continuous operation: 122°F (50°C), Clean In Place (CIP): 122°F (50°C)
pH Range Optimum rejection: 7.0-7.5, Continuous operation: 4.0-11.0, Clean In Place (CIP): 1.0-13.01
Maximum Pressure Drop Over an element: 12 psi (83 kPa) Per housing: 50 psi (345 kPa)
Chlorine Tolerance 1,000+ ppm-hours, dechlorination recommended
Feedwater2 NTU < 1 SDI < 5

1Please refer to Cleaning Guidelines Technical Bulletin TB1194
2SDI is measured on a non-linear scale using a 0.45 micron filter paper. Additionally, finer colloids, particulates and microorganisms that pass through the filter paper and not measured in the SDI test, will potentially foul the RO element. For performance consistency and project warranty, please use Winflows projection software and consult your GE representative.

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