TY - JOUR
TI - Remaining life assessment of a high pressure turbine casing in creep and low cycle service regime
AU - Bakić Gordana
AU - Šijački-Žeravčić Vera M
AU - Đukić Miloš
AU - Rajičić Bratislav
AU - Tasić Marko M
JN - Thermal Science
PY - 2014
VL - 18
IS - 11
SP - 127
EP - 138
PT - Article
AB - 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 100000 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.