[Fabricate [600 mm] [24 inch] [_____] diameter centrifugal dust cyclone
collector(s) of welded steel. Provide all portions of collector(s)
subjected to high temperature flue gas flow with a multilayer internal
lining having specified insulating and abrasion resistant properties
suitable for service intended. In addition, provide inside surfaces of
outlet manifold with ASTM C 401, Class B abrasion resistant lining. Lining
shall be suitable for maximum 343 degrees C 650 degrees Fof metal skin
temperatures. Apply and reinforce lining in accordance with lining
manufacturer's recommendations to resist cracking, spalling, and
blistering. Provide each hopper with a flanged fly ash outlet connection
to accept fly ash transportation system valves. Flange flue gas inlet and
outlet connections and arrange to accommodate connecting breeching as shown
on drawings.]
2.2.1
Structural Supports
**************************************************************************
NOTE: Delete 1st sentence if project is not located
in seismic Zone 3 and 4 of the Uniform Building
Code. Use 6 mm 1/4 inch thick steel for
temperatures over 260 degrees C 500 degrees F.
Detail structural supports on the drawings. Obtain
from manufacturer and provide collector operating
pressure and design pressure (PaWC
negative-positive) and design temperature (degrees C
F) on drawings.
**************************************************************************
[Specify support for dust collector(s) for seismic probability zone [3] [4]
in accordance with Section 15070N MECHANICAL SOUND VIBRATION AND SEISMIC
CONTROL.] Design dust collector(s) to support its own dead weight plus
insulation, maximum weight of accumulated fly ash, and the following
external loads based upon flue gas flow at maximum continuous [boiler]
[incinerator] load rating and maximum pressure drop across the dust
collector.
a.
Snow load, kilogram per square meter pounds per square foot[_____]
b.
Wind load, kilogram per square meter pounds per square foot[_____]
c.
Live load, kilogram per square meter pounds per square foot[_____]
2.2.2
Hoppers
**************************************************************************
NOTE: Specify access door for clean gas side of
collector(s) if such access door is not provided in
the clean gas ductwork.
**************************************************************************
Provide dust hopper(s) with dust collector(s). Provide a minimum of one
pyramid hopper for each collector. Fabricate all hopper plates of 6 mm 1/4
inch thick ASTM A 240/A 240M, Type 316 stainless steel. Provide hopper(s)
with untapered fillet sheets, fabricated of cold rolled 10 gage ASTM A 167
Type 316 stainless steel in each corner. Extend fillet sheets the full
length of the corner. Seal weld the fillet sheets to the hopper walls.
Provide closure sheets at the top of the hopper at each corner to prevent
flow into the area between the fillet sheet and the hopper corner. Steel
reinforcements not in contact with the gas or ash may be either [ASTM A 167
SECTION 15861N
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