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The objective of this DOE sponsored program is to develop a piston-type, dry coal feeder at demonstration plant scale for use in all gasification processes. Three phases now under contract are: establish system requirements, develop piston feeder and pilot plant installation and testing. This report covers the feasibility evaluaion of selected components, the selection of an optimum piston feeder and the analysis of the selected concept. Several candidate piston feeder concepts were subjected to engineering analysis to establish the preferred concept. All concepts are described. On the basis of this analysis, the single-acting piston feeder was selected for further development. Eight variations of the single acting piston feeder were evaluated, all of which are described. Experimental investigations, leading to the definition of suitable inlet and discharge port configurations for the selected feeder version are described. In addition, the experimentation associated with determining suitable seals for the pilot-plant scale feeder is presented. The results obtained with one promising seal configuraion are given. (ERA citation 04:035519)