clamps for optional operation in a fixed location, scraper, and crossover
walk with handrail. The traversing speed shall not exceed 127 mm/sec 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 pushbutton stations shall be
mounted, one on each side of the tripper. Both stations shall include
forward-reverse and tripper stop-run pushbuttons. 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 over each extreme silo. Limit
switches shall be mounted on the tripper to operate immediately beyond both
extreme limits of tripper reversal. A plugged chute switch shall also be
furnished. All tripper controls, including limit switches and reversing
switches shall be furnished in explosion-proof enclosures approved for
Class II, Division 1, Group F service, in accordance with NFPA 70. The
complete tripper shall also include pulley assemblies, shafts, bearings,
carrying and return idlers, tripper framing, and supports.
2.29.18
Trackmobile
Trackmobile shall be provided with a [_____] liter cubic inch industrial
gasoline engine for moving/switching [_____] rail cars on the track and
hauling carts and other portable vehicles while traveling on its road
wheels. The trackmobile shall be designed to ride on [_____] mm inch gauge
track. Rail wheels shall be heat treated, cast steel, keyed on tapered
axles, solidly mounted suspension system. Road wheels shall be, heavy
duty, [_____] ply, [_____] by [_____] tires, roller-bearing mounted wheels,
with retractable suspension. The coupler shall be heavy-duty, cast steel,
remotely controlled from cab. Maximum speed shall be provided on rail
km/hour (mph) low [_____], high [_____]; on road, low [_____], high
[_____]. The trackmobile shall be able to operate on a maximum grade of
[_____] percent and minimum curve of [_____] m foot radius. Trackmobile
shall be also equipped with [air brakes] [self-energizing drum and shoe
type, hydraulic service], cab heater and defroster, sanders, [electric
horn] [air horn] strobe light, front and rear lights, backup alarm,
[enclosed cab] [open cab] with windshield wipers [, radio remote control,]
and power steering.
2.29.19
En-Masse Chain Conveyors
These conveyors shall move materials horizontally and/or vertically, with
multiple discharge points and in a dust-tight and completely enclosed unit.
Conveyors shall have a length as shown but not to exceed 75 m 250 feet.
Conveyor capacity shall be [_____] metric tons/hour tons/hour when handling
coal with approximate weight of 800 kg/cubic meter 50 pcf and with maximum
lump size of [_____] mm inches diameter. Maximum capacity shall be based
on a chain speed not to exceed 813 mm/second 160 fpm. Chain shall be
drop-forged, case hardened, steel alloy of the single-strand type with
flights welded to the chain links or integral chain and flights type. The
hardness of the links shall be 500-600 BHN. The conveyor casing shall be
dust tight and shall be of 6.4 mm 1/4 inch thick ASTM A 242/A 242M high
strength, low alloy steel with 3.416 mm No. 10 gauge cover of the same
material. The casing shall be provided with T-1 steel (ASTM A 514/A 514M
Type B) removable liners. The liners shall be 19.1 mm 3/4 inch thick on
the bottom and 13 mm 1/2 inch thick on the sides, 19 mm 3/4 inch T-1 steel
SECTION 15559A
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