2.9.12.11
Idlers
Troughing idlers shall be the [20] [35] degree three-pulley type with 125 mm
5 inch diameter steel shells, malleable iron end brackets, grease sealed
roller type antifriction bearings, and self-cleaning angle bases.
Troughing idler spacing shall be not greater than 1.37 meters 4 feet 6
inches, with additional idlers at the loading point. Return idler shall be
of the flat single-pulley type having 125 mm 5 inch diameter steel shells,
grease sealed roller type antifriction bearings and spaced on not more than
3 meters 10 foot centers. Provide self-aligning training type trough and
return idlers at not greater than 15.24 meters 50 foot intervals to ensure
proper training of belt.
Extend grease pipes to one side for four point
lubrication from walkway.
2.9.12.12
Load Skirts
Not less than 6 mm 1/4 inch thick steel plate and supported by structural
brackets from conveyor frame. Skirts shall have rubber strips along bottom
edge to seal belt. Strips shall be easily adjustable by means of a clamp
bar arrangement not requiring slotted bolt holes.
2.9.12.13
Frame, Supports, and Walkway
**************************************************************************
NOTE: Designer shall detail footings based on load
and soil conditions at each plant site. Walkway
shall be detailed.
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Frame shall be of the structural steel truss type with head and foot
terminals framed of structural steel. Support frame from grade on
structural A-frames set on concrete footings as indicated. Support idlers
on not less than 150 mm 6 inch channel stringers braced and tied to
structural steel truss frame. Provide a 12 gage (2.66 mm0.1046 inch) steel
deck plate for full length of conveyor. Provide a curved belt cover
constructed of not less than 16 gage (1.52 mm0.0598 inch) corrugated
galvanized metal having removable panels on the walkway side for access to
the idlers. Provide walkway not less than 914 mm 36 inches wide, supported
from the structural steel framing for the entire length of the conveyor.
Walkway shall be complete with handrails and metal nonslip grating meeting
the requirements of 29 CFR 1910-SUBPART D.
2.9.12.14
Discharge Hopper
Construct discharge hopper of not less than 6 mm 1/4 inch thick steel plate
to discharge on a discharge chute. Provide a discharge hood built of 10
gage (3.42 mm0.1345 inch) steel plate enclosing the top, front, and sides
above the discharge hopper.
2.9.13
Coal Scales
Stationary, automatic, dust-proof, belt-fed, batch type with rated capacity
of not less than [_____] Mg tons per hour and a hopper capacity of 91 kg
200 pounds. Coal scales shall be complete units, including the body, belt
feeder, feeder drive, bypass, weighing mechanism, weigh hopper, controls,
counters, and other items required to make a completely automatic coal
scale.
SECTION 15502N
Page 110
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