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0 <br />A 500 tph (maximum) vibrating feeder under the hopper feeds the coal <br />onto Conveyor C-1 for transportation to the loadout. The feeder is a <br />suspended, electro -mechanical type with controls. Feeder pans are <br />lined with high molecular weight polymer, replaceable liners; and <br />there are safety slings and dust seals for connection to skirts. <br />Moving parts of all equipment are readily accessible for inspection, <br />lubrication, repair, and where necessary, are protected from the flow <br />of conveyor material. The pans are designed with a freeze protection <br />spray system to prevent wet coal from freezing to the pans and <br />clogging the system. A manually operated rack and pinion cutoff gate <br />allows removal of the feeder for service, while a manually set gate <br />regulates the feeder material bed depth. <br />A number of sensors are used at the truck dump to indicate various <br />stages of the operation. A shining light, activated by a high-level <br />sensor, indicates a full hopper, while a low-level sensor shuts down <br />• the feeder to prevent the hopper from being drawn empty during loading <br />operations. Another sensor gives the truck drivers a signal when they <br />are in position to dump. <br />• <br />Dust emission control is facilitated by a shirt with a dust <br />suppression spray system at the hopper and another spray system at the <br />feeder area. The dust suppression system operates manually or automa- <br />tically, utilizing material for sensing switches. In addition to <br />signalling the driver when a truck is in position to dump, the flow <br />sensing switch activates the spray system as the coal is dumped into <br />the hopper. The freeze protection spray system operates in a similar <br />manner. A wind shield protects the top of the hopper from excessve <br />dusting and helps to control noise during truck dumping. <br />(2) Conveyor <br />The configuration of Conveyor C-1 is shown on Drawing D-4-13. The <br />4-29 <br />