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• Deterioration of refractory material. <br /> Tendency of the ram loader to drag back burning <br /> material from the primary combustion chamber to <br /> the feed hopper. <br /> • Potential fire hazard due to fluid from burst <br /> hydraulic lines contacting flame or hot metal <br /> surface. <br /> In response to these problems, recent units have incorporated - <br /> such design features as continuous ash removal and large water- <br /> cooled underfire air ports. <br /> The EPA is funding a comprehensive evaluation of the municipal <br /> facility located in North Little Rock. Preliminary results indi- <br /> cate that system reliability is adequate. <br /> Flexibility <br /> The need for flexibility and ease of alteration is due to a number <br /> of variable factors including: <br /> Future capacity requirements; <br /> Change in laws concerning the environment; <br /> ' Change in refuse composition; <br /> Uncertainties regarding the relative values of <br /> energy products and recycled materials; <br /> • Future technical developments. <br /> Flexibility is desirable in a waste-to-energy system in order to <br /> more easily adapt to any of the above variables during the life of <br /> the project. System modularity offers the greatest degreee of <br /> flexibility. Package incinerators with steam-producing capability <br /> are available in 25 and 50 TPD modules . Therefore, this system <br /> offers total flexibility in responding to changes in the waste <br /> stream and steam output requirement. <br /> Ease of Operation and Maintenance <br /> Ease of operation relates to the system' s operating complexity. <br /> Highly complex operations would make proper performance contingent <br /> upon the availability of highly skilled personnel. It is an indi- <br /> cator of the difficulty of day-to-day operation. Operation of the <br /> plant requires relatively unskilled labor. However, licensed boiler <br /> operators are required. Maintenance personnel should be sufficiently <br /> skilled to maintain the electrical and mechanical equipment. <br /> F-ase of maintaining a system and availability of parts and service <br /> are extremely important. In addition to normal wear and tear, <br /> - 35 - <br />