WW-F-2849
which is governed by the condensate storage and surge tank capacity of the
boiler plant,
3.10.12 Filter handling rack. A steel filter rack or support, designed to
permit quick and easy transfer of the filter leaves from the filter tank to the
handling rack for cleaning, shall be furnished. The rack or support shall be
mobile, and so designed that the leaves will be positioned for easy
accessibility for hand peeling of filter cake and cleaning of the leaves.
3.10.13 Mobile cart. When specified (see 6.2), a mobile cart, constructed
of carbon steel, shall be provided to receive the filter cake peeled from the
leaves . The width and length of the cart shall be not less than one and
one-half times the diameter of the filter leaf so as to catch the filter cake
when peeled by ordinary methods. The depth shall be such that the cake from a
complete assembly of leaves can be handled without filling the cart more than
50 percent. The cart shall be equipped with casters and a handle for pulling.
The body shall be watertight in construction, and the surfaces shall be painted
or treated to resist corrosion.
3.11
Type II components.
3.11.1 Tanks. Filter tanks and chemical tanks shall be welded steel
construction and equipped with removable covers to provide easy access for
operation and maintenance. The interior of the tanks shall be accessible for
cleaning and removal of components without disengaging connections or fittings.
Division members between compartments shall be tight with the shell so that no
fluid can be bypassed. The filter tank shall conform to ASME Boiler and
Pressure Vessel Code, Section VIII, Division 1, and shall be furnished with the
ASME Code stamp,
3.11.1.1 Filter tank. Filter tanks may be vertical or horizontal, and shall
provide for feedwater inlet and discharge, filter bed support, sand valve (if
required) , filter bed wash inlet, filter bed agitation, filter bed cleaning, a
means for draining the tank, and filter bed pressure-drop measurement.
3.11.1.2 Chemical tank. The chemical tank shall be provided with a means
for easy charging of chemicals and with storage capacity for a minimum 48-hour
operation. A mechanical agitator shall be provided to maintain the chemicals in
correct consistency. The parts in contact with the chemical shall be of
corrosion-resistant metal, A level gage shall be provided to indicate the
amount of chemicals in the chemical tank.
3.11.2 Filter bed. The filter bed shall be a minimum of 36 inches
(90 centimeters (cm)) in depth. It shall consist of no less than 18 inches
(45 cm) of granular material approximately 0.016 inch (0.4 millimeters (mm)) in
diameter, supported by granules of increasing size for the remainder of the
depth. The design shall prevent the feedwater from bypassing the bed by flow at
the sides of the tank. Feedwater shall not channel through the bed under any
operative condition
The filter bed shall support the granules and prevent
their passage with the feedwater discharge, but shall permit cleaning.
3.11.3 Filter bed cleaning. Mechanical, air, steam, or water agitation and
water-wash apparatus shall be provided, as specified (see 6.2). The apparatus
shall be complete with motors, valves, nozzles, strainers, and all other
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