Two bed ash transfer systems have been used at the Fluidized Bed Combustion Project at Grimethorpe, South Yorkshire, UK. The original system incorporated an ash outlet isolated by a ball valve, leading to a fluidizing pad, to feed solids into a pneumatic conveying pipe line and quench vessel. In the alternative system, the ash outlet leads directly to a cylindrical chamber; here the ash is fluidized and conveyed vertically to the ash quench vessel. Owing to the more complicated equipment and operating requirements, it is envisaged that the wet quench type of ash disposal system used at Grimethorpe would not be used in commercial plant. The report covers aspects of the design, commissioning and operating experience for both ash transfer systems. Commissioning of the original system started in July 1980. However, a number of problems were encountered, and the alternative system was installed in June/July 1981 alongside the original. This new system was successfully commissioned in 1981, and the original system was removed in July 1982.