The A-Series, family of proprietary thin-film reverse osmosis membrane elements are characterized by high flux and excellent 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 psig (689 kPa). AK8040F-400 Low Pressure Brackish Water elements feature a FRP outerwrap and 27 mil feed spacers. This element is designed with flush end connections.
Element Specifications
Model
Flow
Active Area
Avg. Rejection
Min. Rejection
Part Number
AK8040F-400
10,500 GPD (39.7 m3/d)
400 ft2 (37.2 m2)
99%
98%
1206821
Specifications are based on a 500 mg/L NaCl solution at 115 psig operating pressure (793 kPa), 77°F (25°C), 15% recovery, pH 7.5 after 24 hours. Individual flux may vary +25%/ -15%.
Operating and Design Parameters
Membrane:
Thin Film Membrane (TFM®)
Typical Operating Pressure:
110 psig (758 kPa)
Maximum Pressure:
400 psig (2,758 kPa)
Maximum Temperature:
122°F (50°C)
Chlorine Tolerance:
1,000 ppm-hrs, dechlorination recommended
Optimum Rejection pH:
7.0 -7.5
Operating pH Range:
4.0 - 11.0
Cleaning pH Range:
2.0 - 11.5
Maximum Pressure Drop:
10 psig (69 kPa) per element 50 psig (345 kPa) per vessel
Feed NTU:
<1
Feed SDI:
<3
Typical Operating Flux:
10-20 GFD (15-35) L.H-1.M-2
Element Dimensions and Weight
Model Number Legend
AK
8040
F
-400
Model
Dimension A
Dimension B
Dimension C*
Weight
AK8040F-400
40" (1,016 mm)
1.125" (29 mm)
7.88" (200 mm)
32.0 lbs (14.5 kg)
*The element diameter (dimension C) is designed for optimum performance in Osmonics pressure vessels. Other pressure vessel dimension and tolerance may result in excessive bypass and loss of capacity.
