UFC 3-280-03
23 JULY 2003
3-7.1
conditioning calculations are done for the entire treatment facility and are not specifically
for the filter press. Under normal conditions, as described in Subparagraph 2-9.8.2, the
minimum ventilation rate of six air changes per hour for summer ventilation and three air
changes per hour for winter ventilation should be applied. However, for specific areas,
such as those where dust (i.e., lime conditioning) or odor (i.e., ammonia) are possible,
additional ventilation and calculations may be required.
3-7.2
Power Requirements. Several types of calculations for power requirements
can be used in the design of a filter press, including a normal load and lead protection
analysis, a ground fault current analysis, and lighting analysis. These types of
calculations are usually performed as part of the electrical calculations for the entire
treatment facility. Because these calculations are specific to an application and
equipment, only a description follows.
The normal load and load protection analysis consists of determining
electrical loads for the filter press and associated components, such as pumps and
controls. Once the load analysis is completed, a load protection analysis is then
conducted to ensure the proper design and placement of circuit transformers for the
over-current protection of individual components. The ground fault current analysis also
determines the rated listing for individual component.
In addition to direct power requirements, lighting calculations are typically pro-
vided with power calculations. However, the lighting requirements are typically provided
with the entire treatment facility's general lighting calculations, unless special light
requirements for platforms, mezzanines, or catwalks are required.
3-7.3
Water Requirements. Filter presses require water for fire protection as well
as potable water. Water requirements for fire protection are typically calculated for the
entire treatment facility. Potable water requirements are based on frequency, duration,
and quantity required for each specific system within the filter press. Typical
requirements for potable water are dilution water for conditioner preparation, water to
prepare precoat slurry if filtrate water cannot be reused, water for the filter media wash,
and dilution water for filter media acid wash. Based on the specific requirements for
each of these uses, the quantity of potable water required and associated distribution
systems will be calculated.
3-7.4
Air Requirements. In general, air requirements are calculated on the basis of
the frequency, duration, quality, and pressure of air required for several functions within
filter press applications, including pneumatics operating the press, such as hydraulic
press opening/closing and plate shifting, in addition to accessories such as air operated
pumps, core and air blowing systems, inflation systems for diaphragms for variable-
volume filter presses, and pneumatically operated controls. Typically, two types of air
quality are required: instrument air and plant air. The instrument air is typically passed
through an air cooler and air dryer to produce a dry, quality air required for
pneumatically operated controls. Although two types of air are required, only one air
compressor system is typically necessary. Therefore, calculations for the air system
3-7
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