chute shall be 4.8 mm 3/16 inch thick, minimum. Other flat casing members
shall be 2.657 mm (12 gauge) 12 gauge steel thick, minimum. Corner angles
and stiffeners shall be provided to make the elevator self-supporting. In
addition, the elevator shall be tied to the adjoining structure at close
enough spacing to increase the rigidity of the elevator. The boot section
shall be provided with clean-out doors, as well as front and back removable
panels. An inspection door large enough to remove a bucket from either run
of the chain shall be provided in the intermediate section at operating
level. The elevator shall be driven by an electric motor installed in a
suitable housing at the top of the flight. Motors shall be [totally
enclosed, nonventilated] [totally enclosed, fan-cooled type] [totally
enclosed, fan-cooled type suitable for installation in a Class II, Division
1, Group F hazardous location in accordance with NFPA 70]. [Motor starter
shall be [manual] [[magnetic] [across-the-line] [reduced voltage start]]
type with [general-purpose] [weather resistant] [water-tight] [dust-tight]
[explosion-proof] enclosure.] A platform shall be installed adjacent to
the motor for servicing the motor and equipment mounted in the hood.
Access to the platform shall be by an approved type of safety ladder.
Controls for the operation of the elevator shall be located as indicated.
Dust control covers and inlet and discharge enclosures shall be provided
for each conveyor.
2.23.5
Vibrating Conveyor
**************************************************************************
NOTE: Where motor starters for mechanical equipment
are provided in motor control centers, delete the
description of motor starters.
**************************************************************************
Vibrating conveyor shall be the electric-motor driven mechanical vibrating
type with a capacity of [_____] metric tons/hour tons/hour when handling
coal weighing approximately 800 kg/cubic meters 50 pcf and with maximum
lump size of [_____] mm inches in diameter. Conveyor shall have a
conveying length as shown. The conveyor trough shall be fabricated of
[_____] mm gauge steel, [_____] mm inches in width and [_____] mm inches
deep [and provided with dust-tight cover]. Conveyor pans of 9.5 mm 3/8 inch
thick, Type 304L solid stainless steel plate shall be provided. The
trough shall be mounted on vibrator bars, torsion bars, or coil springs
attached to yoker legs of rigid cross brace construction and fabricated of
corrosion-resistant material with hardened steel encased rubber bushings at
articulation points. The base shall be fabricated of steel channels or
angles bolted directly to [building support] [concrete foundations]. The
drive shall be through an eccentric shaft supported by a double row of
self-aligning ball-or roller-bearing pillow blocks. Positive action motion
shall be imparted to the trough by a cast steel connecting rod attached to
the trough by rubber-bushed wristpin and securely locked by taper lock
bushings. The conveyor shall be driven by a [totally enclosed,
nonventilated type] [totally enclosed, fan-cooled type suitable for
installation in Class II, Division 1, Group F hazardous location in
accordance with NFPA 70] electric motor connected to the eccentric shaft by
V-belt drive. [The motor starter shall be [manual] [[magnetic]
[across-the-line] [reduced voltage start]] type with [general-purpose]
[weather-resistant] [water-tight] [dust-tight] [explosion-proof] enclosure.]
2.23.6
Gravimetric Weigh Feeder
The weigh feeder shall be a metering belt type device designed to operate
at a variable rate ranging from 10 percent of maximum capacity to [_____]
SECTION 15555A
Page 70
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