AK Series
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.