UFC 3-280-04
17 DEC 2003
Table C-7. Loading at 12 L/s (190.2 gpm)
1 unit 2.134 m
2 units 1.524 m
3 units1.219 m
(7 ft-0 in.) diameter
(5 ft-0 in.) diameter
(4 ft-0 in.) diameter
12 L/s
6 L/s
4 L/s
Flow Each
(190.2 gpm)
(95.1 gpm)
(63.4 gpm)
3.53 m2
1.77 m2
1.11 m2
Area Each
(38 ft2)
(19 ft2)
(12 ft2)
3.40 L/m2s
3.40 L/m2s
3.59 L/m2s
Hydraulic Loading
(5.01 gpm/ft2)
(5.01 gpm/ft2)
(5.28 gpm/ft2)
Each
0.25 to 0.95 L/s
0.19 to 0.63 L/s
0.19 to 0.50 L/s
Reject Rate Each
(4 to 15 gpm)
(3 to 10 gpm)
(3 to 8 gpm)
3.67 L/m2s
3.76 L/m2s
4.04 L/ m2s
Total Hydraulic
(5.40 gpm/ft2)
(5.53 gpm/ft2)
(5.95 gpm/ft2)
Loading Each
0.95 L/s
1.26 L/s
1.51 L/s
Reject Rate Total
(15 gpm)
(20 gpm)
(24 gpm)
12.95 L/s
13.26 L/s
13.51 L/s
Total Hydraulic
(205.2 gpm)
(210.2 gpm)
(214.2 gpm)
Loading
With one filter unit out of operation
12 L/s
6 L/s
NA
Flow Each
(190.2 gpm)
(95.1 gpm)
3.53 m2
1.77 m2
1.11 m2
Area Each
(38 sq. ft.)
(19 sq. ft.)
(12 sq. ft.)
6.8 L/m2s
5.38 L/m2s
Hydraulic Loading
NA
(10.01gpm/sq. ft.)
(7.93 gpm/sq. ft.)
Each
0.19 to 0.63 L/s
0.19 to 0.50 L/s
NA
Reject Rate Each
(3 to 10 gpm)
(3 to 8 gpm)
7.16 L/m2s
5.83 L/m2s
Total Hydraulic
NA
(10.54 gpm/sq. ft.)
(5.53 gpm/sq. ft.)
Loading Each
0.95 L/s
1.26 L/s
NA
Reject Rate Total
(15 gpm)
(20 gpm)
12.95 L/s
13.26 L/s
Total Hydraulic
NA
(205.2 gpm)
(210.2 gpm)
Loading
It is recommended that duplex 1.5 m (5'-0") diameter units with a nominal
loading of 3.40 L/m2s (5.01 gpm/ ft2) and effective loading of 3.76 L/m2s (5.54 gpm/ ft2)
be specified. During the expected minimum downtime with one of the units is out of
service the single unit rated capacity of 10.1 L/s (160 gpm) would be exceeded which
would result in excessive head losses. It may be necessary to recirculate flows of 2.85
L/s (45.2 gpm) back to the air stripper or to reduce the influent to the treatment plant by
that amount. Reduction of the flow to an air stripper is not usually desirable. A pair of
larger filter units would have substantial excess capacity.
C-13
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