2.9.11.5
Trough
Not less than 6 mm 1/4 inch thick corrosion resistant steel plate made in
boxlike U-shape. Trough shall be removable in not more than 2.44 meters 8
foot long sections and constructed with flanged discharge openings where
indicated.
2.9.11.6
Loading Hopper
Steel plate not less than 6 mm 1/4 inch thick sloped at not less than 60
degrees.
2.9.11.7
Outlets
Bottom of trough shall have [_____] outlets not less than [457] [508] [610]
[762] mm [18] [20] [24] [30] inches long with gates to discharge coal into
cylindrical bunkers. Provide outlets with deflection plate type baffle
designed to make coal drop straight down into bunker.
2.9.11.8
Electric Motor
Totally enclosed, fan cooled, high torque, [_____] volt, three phase, 60
Hz, not less than [_____] kW hp as specified in paragraph entitled "Motors
and Drives." Motor shall be directly connected by means of flexible
coupling to a reduction gear.
2.9.11.9
Gates
Provide coal gates on bottom trough of flight conveyor, immediately under
outlets. Opening shall be [_____] mm inch square with motor operated slide
gates for controlling discharge to each bunker. Provide double rack and
pinion type gates driven by not less than 0.56 kW 3/4 hp motor. Provide
limit switches for signal lights, control and interlocking. Provide
outlets from gates with a 6 mm 1/4 inch abrasion resistant steel plate
discharge chute.
2.9.11.10
Reduction Gear
Alloy steel helical or herringbone gear type with antifriction bearings
enclosed in oiltight housing. Provide an adjustable base for motor and
reduction gear. Drive from output shaft of motor reducer to conveyor head
shaft shall be by means of standard finished steel roller chain conforming
to ASME B29.1M running over cut tooth sprockets conforming to
ASME B29.1M and complete with steel plate chain guard. Roller chain
attachments shall conform to ASME B29.1M. Provide means to properly
tension drive chain.
2.9.12
Belt Conveyor
Inclined and approximately [_____] meters feet between pulley centers,
operated at a speed not to exceed [_____] m/s fpm, and have a capacity of
not less than [_____] Mg tons per hour of [_____] size coal. Provide belt
conveyor complete with continuous belt, shafts, pulleys, idlers, takeups,
belt cleaner, frame with conveyor cover and walkway, transfer chute,
hopper, emergency stop cord and switch, alignment switch, reduction gear,
electric motor, bin high level limit switch and alarm.
SECTION 15501N
Page 82
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