2.11.13.1
Isolation Gates
Each exhauster shall include a manual bolt-up type gate for isolation and
crossover. Gates shall include limit switches for status indication.
2.11.13.2
Accessories
Exhauster shall be complete with belt guard, air inlet silencer, air
discharge snubber, support stand, expansion joint on inlet and outlet, belt
and shaft guards, high temperature safety switch and vacuum relief valve.
2.11.13.3
Electric Motor
Totally enclosed, fan cooled, [_____] volts, three phase, 60 Hz as
specified in paragraph entitled "Motors and Drives."
2.11.13.4
Noise Level
Not to exceed 85 dBA sound pressure level at 1.50 meters 5 feet above the
floor and 1.50 meters 5 feet from blower in any direction.
2.11.14
Pulse Jet Self-Cleaning Bag Filter Assembly
Provide as a tertiary means of removing fine ash particles from the
conveying air system. Installation of the assembly shall be on the silo
roof, downstream of the two-stage cyclone type mechanical separator so as
to permit a combined minimum separating efficiency of 99.5 percent (by
weight), with a guaranteed outlet emission less than 0.005 grains
particulate per dry standard cubic foot of exhaust air. Filter assembly
shall include a main housing, bag assemblies, bag cleaning mechanism,
discharge gate and control panel. Equipment shall be integrated with
cyclone type separators, vacuum breakers, vacuum switches and conveying
system controls as specified elsewhere. Bag filter shall be capable of
operating at 25 percent above the system design vacuum. Filter housing
shall be capable of withstanding a vacuum of 96 kPa 28.5 inches of mercury.
2.11.14.1
Cloth Area
Size filter on the basis of not greater than 25.40 L/s 5 acfm of air per
square meter foot of cloth area. The acfm shall be calculated on the
maximum system air flow.
2.11.14.2
Filter Construction
All welded construction housing or body of, ASTM A 36/A 36M plate with an
upper clean gas plenum, bag compartment, hopper bottom, internal access
platform and support structure. Plate thickness shall be a minimum of 6 mm
1/4 inch with exception of plenum tube sheet, which shall be a minimum of
13 mm 1/2 inch thick. Housing shall be cylindrical, having a minimum
diameter of [_____] meters feet [_____] mm inches.
a.
Upper Gas Plenum: Dished head, with flanged inlet and discharge
connections, tube sheet, venturis and blow tubes. These
appurtenances shall be welded airtight. Venturis shall be
fabricated from carbon steel having a minimum thickness of 16
gage. Minimum centerline spacing between venturis shall be 191 mm
7 1/2 inches. A series of blow tubes shall be employed over the
venturis. Each tube shall extend through dished housing wall and
be manifolded externally. Include support of external manifold.
SECTION 15501N
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