shallow-in-built [track] [truck] hopper. Bar flight feeder shall have a
horizontal length of [_____] meters feet [_____] mm inchesbetween sprocket
centers, operate at not greater than [_____] m/s fpm, and have a capacity
of not less than [_____] Mg tons per hour of [_____] size coal. Provide
feeder complete with continuous chains and attached bars, terminal
sprockets, gears, shafts, bearings, troughs, enclosure, frames, [truck]
[track] hopper, grating, regulating gate, hinged inspection doors,
discharge chute, electric motor, reduction gear, and supports.
2.9.9.1
Head and Foot Shafts
Head and foot shafts shall be not less than [_____ and _____] mm [_____ and
_____] inches in diameter, respectively. Construct shafts of cold rolled
steel and mount in antifriction roller bearings. Mount head shaft in fixed
pillow blocks and foot shaft shall have screw-type takeups with not less
than [_____] mm inches adjustment.
2.9.9.2
Terminal Sprockets
Cast iron with chilled rims not less than 380 mm 15 inches in diameter.
Foot shaft sprockets shall be split type in two 180 degree sections to
facilitate removal in shallow pit.
2.9.9.3
Chains and Flights
Chains shall be bar link type each having a pitch of not greater than 150 mm
6 inches and an ultimate strength of not less than 20,430 kg 45,000 pounds.
Construct chain of heat treated carbon steel components with not less than
a 22 by 38 mm 7/8 by 1 1/2 inch wide center link, 10 mm wide by 38 mm 3/8
inch wide by 1 1/2 inch thick side bars, fastened with 18 mm 5/8 inch
diameter pins. Construct bar flights of 10 mm 3/8 inch thick steel bars
not less than 50 mm 2 inches high with flight width of not less than [_____]
mm inches. Flight spacing shall be such that feeder shall move the
required coal with a head shaft speed not greater than [_____] rpm.
2.9.9.4
Frame and Enclosure
Construct feeder frame of structural steel properly tied and braced,
complete with guides and track for both carrying and return runs, 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 carbon steel wear bars. Enclosure shall
be dusttight of not less than 10 gage (3.42 mm0.1345 inch) commercial hot
rolled steel plate. Enclosure shall be removable in sections. Top and
side panels at head and foot sections shall be hinged and removable for
access to chain sprockets.
2.9.9.5
Trough
Construct with flat bottom of not less than 10 mm 3/8 inch thick steel
plate. Trough shall be removable and constructed with flanged discharge
opening.
2.9.9.6
Hopper
Construct not less than 2 1/2 meters long and 3 meters wide 8 feet long and
10 feet wide of structurally reinforced 10 mm 3/8 inchthick steel plate
lined with 10 gage (3.42 mm0.1345 inch) 410 stainless steel plate. Hopper
sides shall not slope less than 55 degrees from the horizontal. Construct
hopper with a shield over return run so that coal is fed directly to bottom
SECTION 15501N
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