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

Page 2 Fact Sheet
Table 1: Element Specification
Membrane Thin-film membrane (TFM*)
Model
Spacer
mil (mm)
Active area
ft 2 (m 2 )
Part
number
Dairy HWS RO3840C30 30 (0.76) 85 (7.9) 1228223
Dairy HWS RO8038C30 30 (0.76) 390 (36.2) 1206651
Dairy HWS NF3840C30 30 (0.76) 85 (7.9) 1232322
Dairy HWS NF8038C50 50 (1.27) 360 (33.4) 3002372
Figure 1: Element Dimensions Diagram - Female
Table 2: Dimensions and Weight
Model 1
Dimensions, inches (cm) Boxed
A B 2 C
Weight
lbs (kg)
3840C 38.75
(98.4)
0.833
(2.12)
3.8
(9.6)
7
(3.2)
8038C 38.00
(96.52)
1.125
(2.86)
7.91
(20.1)
29
(13.2)
1 These elements are dried and bagged before shipping.
2 Internal diameter.
Table 3: Operating parameters
Do not exceed 20 GFD (33 LMH) or 2,000 Wagner
units under any circumstance.
Typical Operating Pressure 200-500 psi (1,379-3,447 kPa)
Typical Operating Flux 5-20 GFD (8–34 LMH)
Clean Water Flux 1 RO : 14 GFD (24 LMH)@ 225 psi
NF : 14 GFD (24 LMH) @ 110 psi
Maximum Operating Pressure 600 psi (4,137 kPa): 41 – 122°F (26 – 50°C)
Maximum Temperature Continuous operation: 122°F (50°C)
Hot Water Sanitization: 194°F (90°C)
pH Range RO elements: 3.0 – 10.0
NF elements: 3.0 – 9.0
Chlorine Tolerance 500+ ppm hours,
dechlorination recommended
Maximum Pressure Drop Over an element: 15 psi (103 kPa)
Per housing: 60 psi (414 kPa)
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 4: CIP limits for RO elements
Temperature ‘ pH minimum ‘ pH maximum
50°C (122°F) 2.0 11.5
45°C (113°F) 1.5 11.5
35°C (95°F) 1.5 11.5
25°C (77°F) 1.0 12.0
Table 5: CIP limits for NF elements
Temperature ‘ pH minimum ‘ pH maximum
50°C (122°F) 3.0 10.0
45°C (113°F) 2.0 10.5
35°C (95°F) 1.5 11.5
25°C (77°F) 1.0 11.5
Hot Water Sanitization
Recommendations
For optimal performance, Dairy HWS elements
should always be cleaned using approved CIP
procedures and flushed with fouling free water
before the sanitization process. Feed pressure
during sanitization should not exceed 40psi
(275kPa) and the crossflow should not incur a
pressure drop greater than 2psi (14kPa) per
element. Heating rate to sanitizing temperature and
cool down should not be faster than 5°C (41°F) per
minute. Maximum sanitization temperature is 90°C
(194°F).
Loss of Permeate Flow after Repeated
90°C Sanitization Cycles
It is almost impossible to exactly predict the per-
centage of permeate flow rate lost from the high
temperature sanitations, which among other fac-
tors depends on:
1) Rate of temperature increase and decrease.
2) Presence of other species like organics, ionic
and metallic compounds that could locally de-
crease or increase the temperature at the sur-
face of the membrane.
3) Feed flow rate and specifically the heat transfer
rate to the membrane surface.
4) The thickness and geometry of the feed spacer
used.