2.23.9
Vibrator
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NOTE: Where motor starters for mechanical equipment
are provided in motor control centers, delete the
description of motor starters.
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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 seminoiseless 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.
2.23.10
Car Heaters
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NOTE: The designer will 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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2.23.10.1
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
regulator. Heater shall be supplied with electric blower for furnishing
combustion air to the burner and with all other controls and accessories as
recommended by the heater manufacturer for a complete installation, and
shall comply with ANSI Z83.6 and UL 795.
2.23.10.2
Electric Infrared Radiant Heaters
Electric infrared radiant heaters shall be weatherproof car thawing
equipment with radiating surfaces of alloy tubing enclosing electrically
insulated conductors. Heaters shall be designed for hazardous area
locations. The equipment shall be in modular lengths suitable for both 45
and 90 metric tons 50 and 100 ton capacity cars and shall be designed for
[manual] [automatic] disconnection of units not required during thawing
operations. Car heaters shall include sidecar or undercar heating banks,
or both, capable of operating as independent units designed for maintaining
a balanced three-phase distribution system. Heaters shall have heating
conductor units, including factory assembled connections for attachment to
SECTION 15555A
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