A gas turbine washing-date determination apparatus of the present invention is equipped with a sum cost calculation means for calculating a sum of loss cost due to not washing a compressor from a compressor efficiency calculated, and determines a gas turbine washing-date with using the sum of the loss...http://www.google.com/patents/US7162354?utm_source=gb-gplus-sharePatent US7162354 - Apparatus and method for determining date of gas turbine washing
