WW-F-2849
operating pressure at the specified feedwater flow in 3.6.1. The pump supports
shall withstand the strains imposed by the designed operation and size of
piping.
3.10.5 Slurry feed tank. A slurry feed tank of welded steel shall be
furnished for the mixing of filter-aid material and water. The capacity of the
tank shall be sufficient for 2 day's operation under operating conditions
specified.
The tank shall be painted or treated to resist corrosion by the
required filter-aid material and specified feedwater in 3.6.3. A motor-driven,
propeller-type agitator shall be provided and arranged so that it can be
securely attached to and readily removed from the tank. The propeller and shaft
shall be constructed of corrosion-resistant metal. The agitator shall at all
times provide ample mixing of the filter-aid material and feedwater. A cover
shall be provided to protect the tank contents from contamination. The tank
shall be equipped with a feedwater inlet, slurry discharge, drain, and liquid
level gage connections and suitable supports so that it can be secured to
foundations. Unless otherwise specified (see 6.2), the agitator motor shall be
a totally enclosed, nonventilated type and capable of operating on a system of
208 volts, single phase, 60 Hz
3.10.6 Slurry feed pump. The slurry feed pump shall be of the positive
displacement type, adjustable for volume discharge. The pump body shall be of
corrosion-resistant steel or of cast iron, meeting the requirements of ASTM A48,
class 40. All other parts in contact with the chemicals shall be of corrosion-
resistant steel of a type impervious to the chemicals used, filter-aid, water,
and air. The pump, complete with motor, shall be mounted on a bedplate adequate
to maintain alinement. The pump shall be self-priming and have a built-in
bypass valve. Pump capacity shall be at least 10 percent greater than for the
maximum operating condition required to meet the specified performance.
3.10.7 Slurry feed pump controls. The slurry feed pump shall be provided
with means to permit adjusting the volume pumped. Pump control shall be manual
(independent of feedwater flow) or automatic, as specified (see 6.2). Automatic
control shall be one of the following methods, as specified (see 6.2):
a.
Flow - A preset adjustable relation between the slurry feed volume
pumped and the volume of feedwater to the filter and maintain this
relationship over a flow variation, as specified (see 6.2) .
b.
Speed - A preset adjustable relation between the slurry pump speed
and the feedwater pump speed and maintain this relationship over a
feedwater pump speed range, as specified (see 6.2).
c.
On/Off - A preset adjustable relation between the slurry feed volume
pumped and volume of feedwater flowing. The slurry feed pump shall
start and stop corresponding to each start and stop of the feedwater
pump . The slurry feed pump shall operate at constant speed,
3.10.8 Piping and operating accessories. Piping, fittings, strainers,
valves , and accessories shall be furnished to facilitate the operations of
cleaning, draining, depositing and recirculating the precoat, establishing and
maintaining feedwater flow and slurry feed, and all other operations required
for proper performance of the equipment. A sight glass shall be provided for
viewing the discharge from the filter. Precoat and slurry lines shall be as
short and straight as possible and arranged to drain the pumps by gravity.
Automatic vents shall be provided for the relief of air from the filter tank.
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