2.29.8.1
Hopper Gates
A rack-and-pinion gate shall be provided at each hopper outlet and shall be
a self-cleaning type. [Hand-] [Motor-] operated sliding plate shall be 9.5
mm 3/8 inch thick carbon steel, formed into the shape of a winged U. The
gate plate surface shall be completely protected by an overlapping liner of
3.2 mm 1/8 inch thick ASTM A 167, Type 304 stainless steel. The gate body
material, except for the dust cover, shall be of 4.5 mm 3/16 inch thick
ASTM A 167, Type 304L stainless steel where in contact with coal flow.
2.29.8.2
Hopper Feeders
The vibrating or belt feeders, complete with control of manufacturer's
standard design for the service required, shall be provided. Motor shall
be [totally enclosed, nonventilated] [totally enclosed, fan-cooled]
[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 [weather-resistant] [dust-tight]
[explosion-proof] enclosure.]
2.29.9
Vibrator
Vibrator shall be electromagnetic type with variable power control that
produces mechanical pulsating motion. The net weight of the vibrator shall
be [_____] kg pounds and power input shall be [_____] watts, [_____]
amperes at [_____] volts ac. Vibrator shall provide 3600 vibrations per
minute or 7200 vibrations for heavy duty applications. The vibrator shall
be semi-noiseless and shall be provided with mounting plates for welding to
hoppers, as indicated, each complete with an eye bolt for attaching a
safety chain. The electric control suitable for separate wall mounting
shall be complete with an electronic valve for changing alternating current
to mechanical pulsating waves and a dial switch or rheostat to vary the
power of vibration. Vibrators shall be provided with Division I, Class II,
Group F rating in the areas where coal dust is present, in accordance with
NFPA 70.
2.29.10
Car Heaters
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NOTE: The designer shall determine if electrical
facilities are sufficient to provide the power
requirements of electric car heaters or if gas-fired
heaters must be used. The designer will determine
if the location and climatic conditions will require
sidecar panels or undercar heaters, or a combination
of both types of heaters.
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2.29.10.1
Gas-Fired Heaters
Gas-fired heaters shall be the infrared radiant type and shall be located
between rails and along the walls of the shed. Heater shall have an input
of approximately 90 kW 300,000 Btuh. Heater shall have perforated,
heavy-gauge stainless steel cover that is not affected by water or coal
falling from the car. Burner shall have windproof pilot, main gas solenoid
valve, and safety switch to interrupt gas supply to burner if pilot is not
burning, and shall be furnished with manual cutoff valves and pressure
SECTION 15559A
Page 85
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