2.9.10.10
Anchoring Brackets
Provide steel brackets at intervals [as indicated] at [not less than [_____]
meters feet over centers] for anchoring elevator and to increase rigidity.
2.9.11
Flight Conveyor
Dusttight double strand chain-type with [_____] meters feet sprocket
centers, operating speed not greater than [_____] m/s fpm, and having a
capacity of not less than [_____] Mg tons per hour of [_____] size coal.
Provide flight conveyor complete with continuous chain and attached
flights, terminal sprockets, gears, shafts, bearings, trough, casing,
frame, hinged inspection doors, electric motor drive, reduction gear, and
supports. [Design flight conveyor for future length of [_____] meters feet
for future plant expansion.]
2.9.11.1
Head and Foot Shafts
SAE 1045 steel not less than [_____ and _____] mm [_____ and _____] inches
in diameter, respectively, mounted in antifriction tapered roller bearings
with forced lubricating type fittings. Mount head shaft in fixed pillow
blocks. Foot shaft shall have screw-type takeups with not less than [_____]
mm inches adjustment.
2.9.11.2
Terminal Sprockets
Cast iron with chilled rims and not less than 8 teeth.
One sprocket shall
be keyed on shaft and the other shall be free to turn.
2.9.11.3
Flights and Chain
Construct flights not less than [457] [508] [610] [762] mm [18] [20] [24]
[30] inches long and [200] [250] mm [8] [10] inches high of not less than 6
mm 1/4 inch thick abrasion resistant steel. Mount flights at not greater
than [457] [508] [610] [914] mm [18] [20] [24] [36] inch intervals between
two matched strands of steel bushed roller chain having [_____] mm inch
pitch and an ultimate strength of not less than [_____] kg pounds per each
strand. Chain shall have [_____] by [_____] mm inch high carbon steel side
bars, high carbon steel, heat-treated pins, carbon steel case-hardened
bushings, and [_____] mm inch diameter single flange chilled gray iron or
chrome iron rollers. Support chain so that chain does not lie or run in
coal.
2.9.11.4
Frame and Enclosure
Construct conveyor frame of structural steel properly tied and braced,
complete with track for both the carrying and return run of chain of not
less than 80 by 80 by 10 mm 3 by 3 by 3/8 inch steel angles with not less
than 6 mm 1/4 inch high renewable molybdenum steel wear bars. Enclosure
shall be dust-tight of not less than 10 gage (3.42 mm0.1345 inch) hot
rolled steel plate with easily removable side panels containing handles at
each panel end. Enclosure shall have hinged inspection doors 600 mm 24
inches wide and full height of the enclosure opposite loading hopper and at
each discharge chute. End panels shall be hinged and removable for access
to the chain sprockets.
SECTION 15501N
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