UFC 3-280-03
23 JULY 2003
In addition to the daily dosage requirements, the storage requirements can be
determined based on the daily dosage, concentration of chemical purity if less than
100%, and typical desired storage period. Typically, a 30-day storage period is required
for conditioning chemical storage. The chemical feed system's storage requirements
can be calculated by the following equation:
Chemical storage requirement = [(Daily dosage) x (storage period)] / [chemical purity]
Additional calculations are required for the conditioning chemical feed
systems, including the pure chemical feed system, chemical feed solution preparation
and mixing tanks, and solution metering systems. Because these requirements and
related calculations are specific to the types of conditioning chemicals for each filter
press, no specific calculations are provided in this chapter. However, a discussion of
chemical feed systems is presented in Subparagraph 2-4.6.1.
3-4.2.2.2 Filter Media Precoat Feed System. For filter press applications, pure
precoat material storage and feed, precoat preparation (tank storage), and precoat
slurry feed need to be calculated. Because the type of precoat material and dosage
required is specific to each filter press, no calculations for precoat material feed systems
are provided in this chapter. However a discussion of precoat systems is provided in
Subparagraph 2-4.6.2. In addition, a discussion of calculating precoat preparation and
storage is presented in Subparagraph 3-4.2.1.3, and calculations required for pump
sizing can follow the general guidelines provided in Paragraph 3-5.
3-4.2.2.3 Acid Filter Media Wash Systems. For the acid filter media wash system,
calculations include sizing the supplied acid storage tank, supplied acid feed pumps,
acid wash dilution tank, and acid wash feed pumps. The specific requirements for the
components of this system depend on the specific requirements of the filter press (i.e.,
frequency and duration) in addition to the purity of the acid supplied; therefore, no
specific calculations are described in this paragraph. However, a description of design
considerations for acid wash systems is provided in Subparagraph 2-4.6.3.2. In general,
the tank calculations for this system should follow the method presented in
Subparagraph 3-4.2.1.5, and the pump calculations should follow the method presented
in Paragraph 3-5.
3-4.2.3 Additional Accessories. Additional accessories, including pumps and air
compressors, will require design calculations. The calculations required for pumps are
discussed in this chapter in Paragraph 3-5 and air requirements and air compressors
are discussed in Paragraph 3-7.4.
3-5
FLOW-DEPENDENT CALCULATIONS. Flow-dependent calculations are pri-
marily required for pumps and piping distribution systems used within the filter press
application. The typical pumps are those required for sludge feeding, the chemical
conditioning feed pump, the precoat feed pump, and the filter media water wash and
acid wash pumps. Although different types of pumps may be required, the basic
calculations for sizing these pumps are similar and include determining the volumetric
capacity and pressure requirements.
3-5
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