a method for detecting rubbing between components in a steam turbine , the method includes : sensing a temperature at a plurality of locations on a casing of the steam turbine ; comparing the sensed temperatures of the plurality of locations ; detecting the rubbing between the components if one of the plurality of locations has a higher sensed temperature than the sensed temperature at the other plurality of locations , and reporting the rub as being at a location near the one of the plurality of locations having the higher sensed temperature .