UFC 3-280-04
17 DEC 2003
1.4 + 12 + 22 kPa = 35.2 kPa
0.2 + 1.7 + 3.2 psi = 5.1 psi.
After evaluating differing pump curves, the maximum recommended Head loss through
the system with dirty filters equals 138 kPa (20 psi). The estimated loading per filter
based on the manufacturers recommendations, is 0.15 kg (0.33 lb). Calculating the sol-
ids loading based on 1 mg/l (1ppm) and 7 L/s (110 gpm) results in a loading rate of 0.6
kg/day (0.44 lb/day).
7 L/s 1 mg/L 86,400 s/day 106 kg/mg = 0.6 kg/day
The resulting change out frequency is:
0.15 kg/filter 20 filters = 5 days < 2 times/week.
0.6 kg/day
In addition, evaluate the capacity of upstream and downstream tanks based on the op-
erating characteristics of the pumps during clean and dirty filter operations.
Figure D-2. Vendor B Operating Characteristics
Vendor B Water Flow Rate/Differential Pressure
2.2
0.8 microns
2
0.6 microns
1.8
0.4 microns
1.6
0.2 microns
1.4
1.2
1
0.8
0.6
0.4
0.2
0
0
1
2
3
4
5
6
7
8
9
10
Flow Rate [gpm]
D-7
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