degrees C 275 degrees F but not greater than 218 degrees C 425
degrees F. Bags shall have an exterior finish to aid in dust
release.
2.11.14.6
Control Panel
NEMA 4, wall mounted control panel to sequentially control bag cleaning and
dump operations of the filter unit. Locate panel near filter unit to
permit easy field adjustment of sequence timers. Panel overall dimensions
shall be not less than 610 mm wide by 762 mm high by 200 mm deep 24 inches
wide by 30 inches high by 8 inches deep. As a minimum, panel
instrumentation shall include a dump cycle timer, pulse valve sequence
timer, two high differential pressure delay relays, alarm relay, time delay
relay, manual/auto selector switch, pulse valve "ON" indicating light, high
differential indicating light, terminal blocks and internal wiring. Welds
and scratches of panel enclosure shall be polished smooth and thoroughly
cleaned before painting. Surface finish shall be free from blemishes.
Paint panel exterior with manufacturer's standard enamel. Interior of
panel shall be white enamel. Shop inspect panel and test prior to shipment.
2.11.14.7
Vacuum Breakers
Provide two air cylinder operated vacuum breakers. One shall be a pop-up
or single ported type for installation in the air line between the
secondary separator and tertiary bag filter. Second breaker shall be a
three-ported type for locations in the air line between the tertiary bag
filter and the exhauster. Each breaker shall use a disc type gate or
equivalent to ensure full closure of the gate against its mating seat.
2.11.15
Steam Exhauster
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NOTE: The steam exhauster system requires 0.32 kg
os stream 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 hour for 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 steam jet exhauster of cast iron construction with venturi throat
of the high efficiency type for producing the vacuum necessary for handling
ashes through the system. Make inlet air connection on the steam jet
exhauster through a special spiral fitting so that air enters the exhauster
unit tangentially, avoiding direct impingement on the nozzle. Provide a
unit capable of producing a vacuum of at least 40.56 kPa 12 inches of
mercury column at shutoff and not requiring more than [0.32] [0.44] kg of
steam per second at 690 kPa (gage) [2,500] [3,500] pounds of steam per hour
at 100 psig.
2.11.15.1
Steam Condenser, Air Washer and Silencer
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NOTE: The steam exhauster system requires 0.32 kg
SECTION 15501N
Page 102
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