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

Page 2 Fact Sheet
Table 2: Dimensions and Weight
Model 1
Dimensions, inches (cm) Boxed
A B 2 C
Weight
lbs (kg)
Dairy DK3838C 38.00
(96.5)
0.833
(2.12)
3.79
(9.6)
7
(3.2)
Dairy DK3840C 38.75
(98.4)
0.833
(2.12)
3.79
(9.6)
7
(3.2)
Dairy DK8038C 38.00
(96.5)
1.125
(2.89)
7.91
(20.1)
29
(13.2)
Dairy DK8040C 40.00
(101.6)
1.125
(2.86)
7.91 3
(20.1)
29
(13.2)
1 These elements are dried and bagged before shipping.
2 Internal diameter.
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 parameters
Typical Operating Pressure 70-400psi (483-2,757kPa)
Typical Operating Flux 5-20 GFD (8–34 LMH)
Clean Water Flux (CWF) 1 14 GFD (24 LMH) @ 110psi
Maximum Operating Pressure 600psi (4,137kPa)
Maximum Permeate Pressure 2 60 psi (413 kPa)
Maximum Temperature 122°F (50°C)
pH Range 3.0-9.0
Recommended Pressure Drop Over an element: 12psi (83kPa)
Maximum Pressure Drop Over an element: 15psi (103kPa)
Per housing: 60psi (414kPa)
Chlorine Tolerance 500ppm-hours
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%.
2 Permeate pressure should never exceed the concentrate pressure.
Table 4: CIP limits for nanofiltration membranes
Temperature ‘ pH minimum ‘ pH maximum
50°C (122°F) 2.0 11.0 1
50°C (122°F) 2.0 10.5
45°C (113°F) 2.0 11.0
35°C (95°F) 1.5 11.5
25°C (77°F) 1.0 11.5
1
CIP at pH 11 and 50°C is acceptable for heavily fouled systems. For the optimum
membrane element lifetime, pH 10.5 at 50°C (122°F) is recommended for daily CIP
protocol.