A 1000 h program was carried out on the pressurized fluidized bed facility (PFBC) at Leatherhead, England. The main objectives of the program were to assess the performance of materials within the fluidized bed; the corrosion/erosion of candidate gas turbine alloys; and the performance of gas cleaning equipment. The combustor and test procedures are described. The combustion efficiency was 99%. Sulfur retention was typically 90% at a Ca/S mol ratio of 1.75. NO/sub x/ emissions were within EPA limits. A hot gas cleanup system was evaluated for its performance for cleaning the inlet gas stream for a gas turbine. The main conclusion of the program was that there was a significant advance in the confidence in PFBC technology. In particular, the results with first stage turbine blade cascade suggest that reliable gas turbine operation should be possible using cyclone dust collector systems for gas clean-up. (LCL)