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<br />The high belt tensions for the conveyors necessitate the use oP steel reinforced <br />belting, which because oP its weight and lateral rigidity, tends to be inherently <br />self-aligning. The belting is very long-wearing and hsa a relatively small <br />stretch !actor, which simplified the design oP the take-up system. <br />The majority of belt wear and damage occurs at the conveyor transfer points. <br />The coal is accelerated in the direction of the belt travel before loading and is <br />centered on the belt. <br />Belt cleaners are placed at the head pulley of each conveyor. They prevent coal <br />accumulations ahead oP the belt turnovers and reduce snub pulley wear. <br />Western Fuel-Utah, Inc. commits to a maintenance plan for removal of coal <br />accumulations along the Overland Conveyor Strucutre. Singificant accumulations <br />that occur from spillage during the previous month will be removed and disposed <br />of at the Refuse Area. Halt turnover areas as well as sediment control <br />structures will be inspected_mon_th_ly for_ accumulations and cleaned as necessary. <br />~ Areas that cannot be reached by motorized vehicles, such as CNV-1 above the <br />Bath House parking lot, will be cleaned using manual labor. A hay bale and silt <br />Pendsediment trap strucurre has been installed at this area Por additional <br />rotection of coal tines contamination into the undisturbed drainage system. <br />Long conveyor belts are twisted 180 degrees after the belt passes the discharge <br />pulley. This puts the clean aide of the belt in contact with the return idlers <br />which reduces idler and belt wear and prevents particles oP coal Prom falling <br />under the conveyor. Another 180-degree twist is made ahead o! the tail pulleys. <br />Conveyors era covered the entire length. The covers extend about <br />three-quarters of the area around the belt in order to protect the conveyor from <br />snow and rain and keep the wind from blowing coal off the belt. <br />The conveyor drive consists of an electric motor and a variable-speed <br />hydroviscous drive for gently accelerating the belting during start-ups (soft <br />starts). The electric motor accelerates before the conveyor load is engaged. <br />The variable-speed drive clutch plates begins st 100 percent slip. Then the <br />automatic controls bring the clutch plates together at a controlled rate until <br />there is no slip as the conveyor reaches Pull speed. The conveyor start-up time <br />can be adjusted from a few seconds to over several minutes. Drive units for <br />the conveyors have been standardized by using 700-hp motors and <br />variable-speed hydroviscous drives and couplings to minimize the spare parts <br />inventory. <br />rrP.,_ , i i9n~ Tv_ , a <br />