Residual life estimation of a thermal power plant component: The high-pressure turbine housing case

Abstract

This study focuses on the estimation of residual life of damaged thermal power plant components. The high-pressure turbine housing was chosen as an example of thermal power plant component where, during the years of exploitation, damage appeared in the form of dominant crack. Residual life estimation procedure, based upon experimental and numerical methods has been introduced and applied. Material properties were determined experimentally both at room and operating temperature, while all necessary calculations were performed by the special finite element method, so-called X-FEM. The residual life estimation of the damaged high-pressure turbine housing was performed by applying the Paris's law for crack growth analysis.

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

“…During the calculation of turbine components that work at increased temperatures, >400°C, material damage caused by creep conditions and conditions caused by low-cycle fati¬gue need to be taken into consideration [1,[4][5][6][7][8]. Taking into account the simultaneous acting of these two damage mechanisms, it is necessary to sum their effects, which is, in case of turbine elements, most frequently performed by applying linear theory of damage accumulation.…”

“…Stable crack growth rate is dependent from many factors [4,[10][11][12], hence cycle load is determined according to Paris law, which, in case of existence of a crack with length a, can be described by eq. 5.…”

Influence of temperature and hydrogen on fatigue fracture of 10Kh15N27T3V2MR steel

“…For the solution of these questions specialists conduct more precise calculation of tensionally deformed state of elements of turbine equipment under the influence of operating loading with the use of modern calculation packages, and also prognosis of crack growth through making use approaches of linear fracture mechanics (Vasovic et al, 2014;Belogurov et al, 2004;Fishgoit and Kolachev, 1997;Liu and Macdonald, 1997;Jovicic et al, 2009;Kim, 1999;Panasyuk et al, 2012). By results of conducted calculations, recommendations about expedience of repair and terms of further use in the case of a sample of the crack until the next inspection are given.…”

Fracture mechanics analysis of damaged turbine rotor discs using finite element method

“…In low pressure (LP) steam turbine, rotating discs are simultaneously subjected to mechanical and moderate thermal load [1,2]. A disc is loaded under internal pressure due to shrink fit on a shaft.…”