WW-F-2849
3.4.1 Type I. precoat type. The precoat type filters shall use a deposited
absorbent filter cake for removal of oil and suspended solids from the boiler
feedwater, including condensate and raw makeup water. The filter system shall
(1) a series of metal screen, plates, tubular elements,
consist principally of:
or filter leaves arranged in parallel in a tank, vertically or horizontally;
(2) a support for holding the leaves and for stripping filter cake; and
(3) separate tanks for precoat and slurry feed material. Additional components,
accessories, pumps, agitators, piping, and fittings required for satisfactory
operation of the filter system shall also be furnished.
3.4.2 Type II. chemical type
The chemical type filter shall remove oil
from the boiler feedwater, including condensate and raw makeup water, by means
of chemicals. These chemicals react with oil to form solid particles which, in
turn, coagulate into a floe and are deposited on a granular bed. The granular
bed also filters out the suspended solids. The filter system shall consist of a
filter tank, filter bed, chemical tank, chemical feed pump, means for cleaning
the filter bed, and necessary interconnecting piping and fittings of suitable
size and characteristics. Additional equipment required for the satisfactory
operation of the unit shall be included.
3.4.3 Type IUI I. disk-cartridge type. The disk-cartridge type filter shall
use an assembly of disposable disk-cartridges for removal of oil, suspended
solids, chlorine or organics, as specified (see 6.2), from the boiler feedwater,
including condensate and raw makeup water. The filter shall consist of a
pressure tank for holding the disk-cartridges and additional components,
accessories, piping, and fittings required for the satisfactory operation of the
filter system. The feedwater enters the housing and flows over and through each
disk-cartridge cell. It is discharged at the inside diameter of the cartridge
and then passes down through the center support and out of the filter housing.
3.5 Interchangeability. All units of the same classification furnished with
similar options under a specific contract shall be identical to the extent
necessary to insure interchangeability of component parts, assemblies,
accessories, and spare parts,
3.6 operating conditions .
The filter system shall operate at the conditions
specified herein.
3.6.1 Feedwater temperature and flow. The normal operating temperature of
the incoming feedwater, in degrees Fahrenheit (°F) (degrees Celsius (°C)) and
feedwater flow in gallons per minute (gpm) (liters per second (L/s)), shall be
as specified (see 6.2).
3.6.2 Operating pressure. The normal operating pressure of the incoming
feedwater to the filter unit, in pounds per square inch gage (psig) (kilopascals
(kPa)), shall be as specified (see 6.2).
3.6.3 Feedwater impurities. The feedwater impurities and level of
concentration shall be as specified (see 6.2 and 6.8).
3.7 Capacity. Filter capacity for type I units shall be based on a flow of
feedwater through the filter of not greater than l-gpm per square foot
(0.063 L/s per square meter) of filter leaf or element area. Filter capacity
for type II units shall be based on a flow of feedwater of not greater than
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