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• <br />The particular items to be accomplished within this task <br />include: <br />a. Determining the overall size of the coarse refuse de- <br />watering screen and the individual cloth size <br />b. Specifying the size and number of solid bowl centri- <br />fuge(s) <br />c. Selecting a polymer system including tanks, agitators, <br />and polymer pump <br />d. Specifying the type, size and number of pumps for water <br />return to the wash plant. <br />Pneumatic Feeder System <br />The pneumatic feeder system will be designed, costed, and <br />engineered by Radmark Engineering. The pneumatic feeder system <br />will include an infeed belt conveyor, blower, hydraulic power <br />pack, feeder, pipeline and stowing deflector. Radmark will <br />provide equipment specifications for the pneumatic placement of <br />solids at rates of 100 to 150 ton/hr and transport distances of <br />500, 1000 and 1500 ft. This information will provide adequate <br />flexibility in design needed to minimize movement of the de- <br />watering station. The equipment costs, noise levels, and power <br />requirements will be included in the design specifications. <br />Similar to the slurry lines, provisions will be made in the <br />pneumatic pipeline for insertion of pipe sections which have been <br />constructed from various materials. These specialty pipe sections <br />will be easily removed from the pipeline to permit inspection <br />(visual and weighing) of pipe wear at regular intervals. <br />System Control <br />A control system will be specified which will allow fail- <br />safe operation. Controls will be designed to automatically dump <br />the slurry and s*_ockpile solids on the surface if a failure <br />occurs. <br />The underground disposal system will be operable from the <br />pneumatic feeder/dewatering station under normal operation, but <br />can be shut down from the surface injection point/wash plant <br />during emergencies. The surface injection system will be <br />• <br />