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Thick walled components such as high pressure (HP) steam turbine casings   operating under high parameter conditions are subjected to a complex stress   state. As a result of that stress state, some parts of HP turbine casing   undergo to the creep fatigue caused by the combination of thermal fatigue   resulted from repeated start/stop operation and the creep which occurs during   long-term operation at high temperature and high-pressure. It is well known   that domestic thermal power plants have been in use over 1 h which means   that significant cost is required not only for maintenance, but often for   renewal of equipment. Based on comprehensive investigation, the results of   residual life assessment of one high pressure steam turbine casing, which   belongs to the older turbine generation, taking into account simultaneous   action of thermal fatigue and creep, are presented in this paper. Also, the   critical flaw crack size of HP turbine casing is determined because this   parameter has a strong influence on casing integrity and residual life. The   results of residual life assessment provide not only a basis for further   maintenance, but also estimated time for reparation or renewal

Remaining life assessment of a high pressure turbine casing in creep and low cycle service regime