UFC 3-280-04
17 DEC 2003
E-3
NUMBER OF FILTERS REQUIRED. Use Vendor B literature to illustrate, and
reference Table E-4, Table E-6, Table E-7, and Figure E-1. Refer to Table E-7 which
indicates 1 No. 1 bag, model FSP-40 has a maximum capacity of 5.7 L/sec (90 gpm),
and 1 No. 2 bag, for standard filter vessel model FSP-85, can handle a maximum flow
of 12.6 L/s (200 gpm). Select the larger bag which will afford a much greater capacity in
a single unit. The filter hydraulic loading based on the bags surface area of 0.41 m (4.4
ft2) is calculated below:
12.6 L/s
Hydraulic Filter Loading =
= 30.8 L/s m2
2
0.41 m filter surface area
E-4
HOUSING SELECTION. The materials of construction must be suitable for
the waste stream characteristics including temperature. The Vendor B product bulletin
has housings, which are compatible. According to the Vendor B data, the FSP-85 unit
would be suitable for this application with a number 2-size bag. A typical bag filter sys-
tem is shown in Figure E-2.
E-5
HYDRAULIC CONSIDERATIONS. The procedure for calculating Head loss
through the unit is similar to the cartridge filter example. Refer to Appendix D and
manufacturer `s literature for additional information and calculation procedures.
E-6
COMPARISON TO CARTRIDGE FILTER DESIGN. The bag filter requires
only one bag as opposed to the 20 filter cartridges required to treat the same waste
stream. This significantly reduces disposal cost when a bag filter is used versus filter
cartridges.
The bag filter operates at approximately 90 times the hydraulic loading rate
for the same throughput.
One additional consideration is that provisions could made to clean the bag
filter for reuse and that systems are available in flow rates beyond the scope of this
document.
E-7
FILTER BAGS
Table E-2. Vendor A Bag Media And Micron Ratings
1 Fibers & Media
2 Micron Rating
PECG - polyester/cotton
1, 3
PEIF - polyester inserted
1, 3, 5, 10, 15, 25, 50, 75, 100, 200
PENF - polyester non-inserted
5, 10, 15, 25, 50, 75, 100
PEIG - polyester inserted
1, 3, 5, 10, 15, 25, 50, 75, 100, 200
glazed
PENG - polyester non-inserted
5, 10, 15, 25, 50, 75, 100
glazed
E-2
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