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.
2.23.18
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 [_____] 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, back-up alarm,
[enclosed cab] [open cab] with windshield wipers [,radio remote control,]
and power steering.
2.23.19
En-Masse Chain Conveyors
These conveyors 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 800 mm/sec 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) 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 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 wear bars shall be provided for the empty run of the conveyor.
Liners and wear bars shall be attached to the casing using countersunk
stainless steel bolts with stainless steel nuts and washers. Drive
sprocket shall be heat treated, induction hardened to a minimum depth of
6.4 mm 1/4 inch. Drive shaft shall be heat treated, designed and sized
based on AGMA 6010 requirements. Bearings shall be spherical double roller
bearings. A dust seal shall be provided where the drive shaft ends go
through the casing. The conveyor shall have inlet and outlet spouts,
inspection doors giving access to the drive sprocket, cleaner and wear
surfaces. Chain tension is achieved by a screw take-up. Each discharge
opening shall be provided with rack-and-pinion-operated gates with
[handwheels] [motor operated] [air operated]. Motor shall drive conveyor
through a speed reduction unit which is either direct-connected or
SECTION 15555A
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