tons/hour tons/hour when handling average size bituminous coal. Housings
shall be made of heavy castings or welded heavy steel plate. Interior of
the housing shall have replaceable liners, constructed of abrasion
resistant steel. Breaker plate, grates, rolling rings, swing hammers, and
other parts of the unit subject to excessive wearing shall be replaceable.
Crusher shall have provisions to trap and reject hard foreign objects
without damaging the crusher. Shafts shall be forged, heat-treated alloy
steel with bearings mounted in dust-tight housings. Motor shall be
[totally enclosed, nonventilated type] [totally enclosed, fan-cooled type]
[totally enclosed, fan-cooled type suitable for installation in a Class II,
Division 1, Group F hazardous location in accordance with NFPA 70]. [Motor
starter shall be [manual] [[magnetic] [across-the-line] [reduced voltage
start]] type with [general-purpose] [weather-resistant] [water-tight]
[dust-tight] [explosion-proof] enclosure.]
2.23.16
Vibrating Feeders
Vibrating feeders shall be the [electro-magnetic] [electro-mechanical]
[single input (Brute Force)] type with a capacity of 0 to [_____] metric
tons/hour 0 to [_____] tons/hour when handling coal weighing approximately
800 kg/cubic meter 50 pcf and with maximum lump size of [_____] mm inches
in diameter. Feeder pans and skirts shall be of replaceable [6.4] [9.5]
[12.7] mm [1/4] [3/8] [1/2] inch thick, Type 304 solid stainless steel
plate without liners. The feeder pan shall be fabricated [_____] mm inches
in width, [_____] mm inches in length, and [_____] mm inches deep. Dust
control covers of 3.416 mm (No. 10 gauge) No. 10 gauge thick steel shall be
provided for each unit. [Two] [Four] rectangular poke holes ([one] [two]
each side) shall be provided with 6.4 mm 1/4 inch thick Type 304L stainless
steel sliding covers. All feeder parts coming in contact with coal shall
be made of, or lined with, Type 304 stainless steel. All feeders shall
automatically compensate for material headloads and weight effect to
maintain a constant feed and must not damper out when operating under full
silos or bins. Slopes on pan shall not exceed 10 degrees. The vibratory
feeders shall be [foot] [suspension] mounted and shall be completed with
supports. Suspended feeders shall be provided with safety cables. The
feeders shall have their drives located [above] [below] trough. The motors
shall be [totally enclosed, nonventilated type] [totally enclosed,
fan-cooled type suitable for installation in Class II, Division I, Group F
hazardous location in accordance with NFPA 70].
2.23.17
Tripper
The tripper shall be of steel construction, motor propelled, automatically
reversible, or manually controlled. The tripper shall be equipped with
antifriction bearings throughout, rolled or forged steel wheels,
hand-operated rail clamps for optional operation in a fixed location,
scraper, and crossover walk with handrail. The traversing speed shall not
exceed 127 mm/second 25 fpm, and the motor shall include a motor brake.
The chute shall be one way toward the center of the silo and shall slope at
not less than 55 degrees. Its seal shall be provided with all necessary
components for installation to suit the bunker/silo slot. Seal shall be of
the plow type. The tripper shall be provided with [_____] W hp motor, all
reversing and end travel limit switches, cable reel, and 14 No. 12 AWG
conductor cable (13 slip rings) and supports for the starter. Two
push-button stations shall be mounted, one on each side of the tripper.
Both stations shall include forward-reverse and tripper stop-run push
buttons. The conveyor frame shall include a ladder type cable tray to
contain the cable from the reel. Reversing switches shall be mounted on
the tripper and be actuated by track dogs to permit reversal of the tripper
SECTION 15555A
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