of steam per second 2500 pounds of steam per hour
for a 150 mm 6 inch system (8 to 23 Mg9 to 25 tons
per hour) and 0.44 kg of steam per second 3500
pounds of steam per hourfor an 200 mm 8 inch system (
13.60 to 31.75 Mg15 to 35 tons per hour) and
approximately 1.89 L/s 30 gpm of water to the air
washer. A steam condenser, air washer and silencer
should be used when the steam exhauster is used and
should not be used when a mechanical exhauster is
specified.
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Provide a double stage cyclone type steam condenser, which also extracts
the remaining solids from the steam-air system. Construct steam condenser
body of hard metal castings not less than 16 mm 5/8 inch thick suitable for
this special service except that inlet connector shall be not less than 19
mm 3/4 inch thick. Castings shall have a Brinell hardness of not less than
250. Remaining metal used in the condenser shall be at least 6 mm 1/4 inch
thick steel with the top not less than 13 mm 1/2 inch thick steel plate.
Provide drain connection not less than 76 mm 3 inches and water connection
not less than 38 mm 1 1/2 inches. Provide silencer as required for quiet
operation.
2.11.16
Ash Storage Silo
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NOTE: Use enclosure for silo roof and unloader
level in climates where protection of equipment and
personnel from the weather is desired.
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[_____] meters feet in diameter with [_____] meters feet high walls with a
live bottom and flyash storage capacity of not less than [_____] Mg tons,
based on ash bulk density of 640 kg per cubic meter 40 pounds per cubic foot
for volumetric sizing. Structural joints shall be dusttight and
watertight. Provide columns, beams, bracing, and other structural members
as required for complete erection of silo and accessories. Live storage
capacity shall allow for 20 degree angle of repose from silo outlet.
Height of silo storage shall not be more than twice the diameter. Provide
a minimum of one meter 3 feet of freeboard above the ash level. Design of
support steel shall be approved by the ash system supplier. Design silo in
accordance with the ICBO UBC. Design shall take into account seismic load,
wind load, snow load, equipment loads and an ash bulk density of 1120 kg
per cubic meter 70 pounds per cubic foot. Ash silo support shall be free
standing and shall be of sufficient height to allow gravity discharge of
ash through the rotary ash conditioner to a [truck] [railroad car].
Provide access stair tower with intermediate platforms at 3.66 meters 12
feet intervals for access to ash conditioner level, silo floor level and
silo roof level. Platforms from adjacent structures with stair access may
be provided in lieu of the stair tower, but ladders with safety cages and
access platforms must then be also provided. Provide ladder with stainless
steel fall prevention device on inside of silo from manhole in top of silo
to bottom of silo. [Provide silo roof enclosure and unloader room
enclosure each with single one by two meters 3 by 7 feet access door,
[_____] by [_____] meters feet double door, two windows, ventilator,
[heater], insulated metal panel siding to match boiler plant walls and
electrical lighting and convenience receptacles. Unloader room enclosure
shall have reinforced concrete floor.]
SECTION 15501N
Page 103
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