GE P&W Spiral Wound Membranes - Duracid Series - Manual (Page 2)

Page 2 Fact Sheet
Table 3: Element Specification
Membrane Duracid, Thin-film membrane (TFM*)
Model
Average
permeate
flow, gpd
(m 3 /day) 1,2
Average
permeate
flow, gpd
(m 3 /day) 1,3
Maximum
crossflow gpm
(m 3 /hr)
Average
MgSO
4
rejection
1,2
Duracid NF2540F30 120
(0.5)
560
(2.1)
7
(1.6)
98 %
Duracid NF4040F35
405
(1.5) 1900
(7.2)
18
(4.1)
98 %
Duracid NF8040F35 2210
(8.4)
10400
(39.4)
70
(15.9)
98 %
1 Average permeate flow and salt rejection measured on pre-conditioned ele-
ments after 24 hours operation. Individual flow rate may vary ±25%
2 Testing conditions: 2,000ppm MgSO
4
solution at 110psi (760kPa) operating
pressure, 77 °F (25°C), 15 % recovery.
3 Testing conditions: 3% glucose solution at 440psi (3034kPa) operating pressure,
77⁰F (25⁰C), 15% recovery.
Model
Spacer
mil (mm)
Active
area
ft 2 (m 2 )
Outer wrap
Part
number
Duracid NF2540F30 30 (0.76) 15 (1.4) Fiberglass 1231058
Duracid NF4040FM 35 (0.89) 52 (4.8) Fiberglass 3050564
Duracid NF8040F35 35 (0.89) 285 (26.5) Fiberglass 1231068
Figure 1: Element Dimensions Diagram (Male) – 2540 &
4040
Figure 2: Element Dimensions Diagram (Female) – 8040
Table 4: Dimensions and Weight
Model 1
Dimensions, inches (cm) Boxed
A B 2 C
Weight
lbs (kg)
Duracid NF2540F30
40.0
(101.6)
0.75
(1.9) OD
2.4
(6.1)
4
(1.8)
Duracid NF4040F35
40.0
(101.6)
0.75
(1.9) OD
3.9
(9.9)
9
(4.1)
Duracid NF8040F35
40.0
(101.6)
1.125
(2.86)
7.9
(20.0)
29
(13.2)
1 These elements are dried then bagged before shipping.
2 Internal diameter unless specified OD (outside diameter).
Table 5: Operating and CIP parameters
Typical Operating Pressure 400 – 800psi (2758 – 5516kPa)
Typical Operating Flux 5 – 14 GFD (9 – 24 LMH)
Clean Water Flux (CWF) 1 10-19 GFD (17-32 LMH) @ 225psi (1551kPa)
Maximum Operating
Pressure 1200psi (8,273kPa)
800psi (5,515kPa)
600 psi (4,136kPa) 32 – 77°F (0 – 25°C)
78 – 122°F (26 – 50°C)
123 – 158°F (51 – 70°C)
Maximum Temperature Continuous operation: 158°F (70°C)
Clean-In-Place (CIP): 158°F (70°C)
pH Range Continuous operation: < 9
Clean-In-Place (CIP): < 9
Chlorine Tolerance 500 ppm-hrs,
dechlorination recommended
1 Clean water flux (CWF) is the rate of water permeability through the membrane
after cleaning (CIP) at reproducible temperature and pressure. It is important to
monitor CWF after each cleaning cycle to determine if the system is being
cleaned effectively. CWF can vary ±25%.
Table 6: Maximum Pressure Drops
Range
0°C-50°C
psig (kPa)
51°C-70°C
psig (kPa)
Over an element 15 (103) 7 (48)
Per housing 60 (414) 30 (207)
Pre-conditioned Elements
To optimize flow and rejection performance of
Duracid membranes, a pre-conditioning step is re-
quired. Element pre-conditioning consists of a 5min
pure water flush at a minimum pressure of 500 psig
(3447kPa) at ambient temperature.