Erosion of turbine blades is a major cause of plant outage within the C.E.G.B., and the mechanism and methods of protection which have been adopted are described in some detail in this paper. The turbine outage time arising from corrosion causes is far less than that due to erosion but, nevertheless, a few persistent corrosion problems remain. These problems—the corrosion of white metal bearings, the seizing of 3% Cr‐Mo shafts and ‘blue blush’ of valves—are described. The first two of these are currently under investigation, whilst the latter has now been overcome by the use of alternative resistant materials