During the month of July 1983, the program objectives for Test G-21 were developed recommending that the gasifier be operated at 500 psig with Illinois No. 6 coal instead of 750 psig. It was suggested to reduce the gasifier pressure in order to decrease or eliminate the char agglomeration occurring in Stage I of the gasifier. Included in the July operations section are reports on the theory of formation of agglomerates and on terminal velocity of char particles at operating pressures of 500 and 750 psig. Test G-22 was conducted August 30-September 2, 1983 with: 61.3 hours of coal feed to the gasifier, 59.2 hours of char feed, and 67.0 hours of char burner firing. Char feed to the gasifier was steady and able to be maintained for a significant period of time while the char valves were full open and there was no level in the feed vessel. When the valves were closed, a level established and the valves reopened; problems with char feed occurred. After a period of poor char feed, coal feed was reduced and the char vessel was emptied. Feed improved after these measures were taken, once again establishing that char feed with Illinois No. 6 coal can be readily maintained with the valves full open and no feed vessel level but once the valve openings are reduced and a level built, plugging develops. 1 figure, 14 tables.