Preparation System," and herein. Motors shall be as specified in paragraph
entitled "Pumps, Values, Motors." Provide structural and miscellaneous
steel as required for support of equipment, framing of the equipment
enclosure, and access to equipment, as specified. Structural design shall
be as specified in paragraph entitled "Structural and Miscellaneous Steel."
Equipment shall be arranged within the lime system enclosure to allow easy
access for operation and maintenance. Arrange equipment on multiple levels
as follows: Slurry storage tank and pumps shall be located on the lower
level; lime feeders, slakers, and grit screens shall be located on a level
above the tanks so that slurry flows by gravity into the tank. Headroom
between each level and the structural supports for the level above shall be
3 meters 10 feet minimum. The lime system enclosure shall be located in
the area between spray dryer absorbers. The plan area of the enclosure
shall be not less than 37 square meters 400 square feet. The length and
width of the enclosure shall be selected to be compatible with the
Contractor's general arrangement to minimize displacement of the spray
dryer absorbers. The length and width of the enclosure shall be selected
to be compatible with the Contractor's general arrangement to minimize
displacement of the spray dryer absorbers and fabric filter baghouses from
the boiler centerlines. To provide for adequate lime system equipment
layout the Contractor's structural framing arrangement may provide for
connection of the enclosure for the lime system and that for one or both of
the hopper enclosures for spray dryer absorbers and fabric filter baghouses
from the boiler centerlines. Provide interior access to each lime system
equipment level to provide Class one personnel access as specified in the
paragraph entitled "Structural and Miscellaneous Steel." The enclosure
framing shall allow for the location of an 2440 mm 8 foot wide roll-up door
(to be provided by the Contractor) to provide access to the Government's
grit disposal bin by forklift truck. Components shall be tested at the
factory to verify proper operation of controls, motors, and equipment
components. Notify the Contracting Officer, in writing, at least 30 days
in advance of the final complete system factory tests, so that he may have
a representative observe the tests. Provide information necessary to
determine the structural design requirements of the concrete foundation
pad. Provide necessary erection drawings and installation instructions.
Include submittal information on the categories general arrangement,
foundation design, piping, erection, instrumentation, internal arrangement,
wiring, valves, and electric motors. The exterior of the lime storage and
feed bin shall be cleaned and primed as specified in the paragraph entitled
"Structural and Miscellaneous Steel." Other lime slurry preparation system
component equipment shall be provided with the manufacturer's standard
finish.
2.9.1
Lime Storage and Feed Bin
The lime preparation system shall have an integral storage and feed bin for
pebble lime. The bin shall be shop fabricated, all welded construction of
carbon steel plate with a minimum thickness of 6 mm 1/4 inch, conforming to
ASTM A 36/A 36M. The bin shall be structurally supported as necessary to
provide for enclosed areas for equipment levels directly beneath the bin
cone hoppers. The lime preparation system structure shall be designed for
wind, snow, seismic and other loads, as specified in paragraph entitled
"Structural and Miscellaneous Steel." Structural design shall be based on
a bulk density for pebble lime of 1040 kg per cubic meter 65 pounds per
cubic foot. Bin diameter shall be 3.70 meters 12 feet. Bin height shall
be based on pebble lime bulk density of 880 kg per cubic meter 55 pounds
per cubic foot and angle or repose of 55 degrees. Bin shall be cylindrical
with twin, 60 degree minimum conical bottom hoppers. Roof shall be sloped
1:12 for drainage. The roof shall have an inlet target box located at the
SECTION 15864N
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