Abstract: A cleaning method is disclosed for wet cleaning of an exhaust-gas turbine. An amount of cleaning fluid injected via a nozzle into the flow duct of the turbine can be variable over a course of time about a defined mean amount of cleaning fluid.

Abstract: A method is proposed for the estimating of the residual service life of an apparatus which is subjected to wear during operation steps. For at least one characteristic parameter (T) which is sensitive to the wear (V), a relationship is determined to a time parameter (A) which is representative for the operating period, and a limit value (G) is fixed for the characteristic parameter (T) which gives the maximum permitted wear. A code field (KF) is established which gives a relationship between the characteristic parameter (T), the time parameter (A) and the wear (V), actual values are determined for the characteristic parameter (T) in dependence on the time parameter (A) with the aid of data obtained by a measurement, and the instantaneously present wear (V) is determined from the actual values with reference in each case to the code field (KF).

Abstract: A method is proposed for the estimating of the residual service life of an apparatus which is subjected to a wear during operation, with the following steps: