Fault Statistics and Mode Analysis of Steam-Induced Vibration of Steam Turbine Based on FMEA Method

Steam-induced vibration is a kind of self-excited vibration which is one of the most important issues affecting the operation reliability of steam turbines. A lot of actual cases of steam-induced vibration of steam turbine were collected in this work. And steam-induced vibration fault was statistical and classified by fault reason, happened time, occurrence load and fault severity. The statistical results show that steam-induced vibration usually occurs after turbine runs one year later and turbine is with a high load. Oil temperature change is the main running parameters which affect steam-induced vibration. Improper opening and order of adjustment valve is the most important factor causing steam-induced vibration fault. Failure Mode and Effect Analysis(FMEA) was an analysis method faced to system specific physical unit. Based on the FMEA method and the fault statistics results, fault mode of steam-induced vibration was analyzed in detail. And the fault tree analysis of steam-induced vibration was constructed. Some valuable conclusions were achieved, including the fault symptoms, fault consequence and effect, fault causes, preventive actions and other information of steam-induced vibration.