Naslov
Corrosion fatigue failure of steam turbine moving blades: A case study

Autori
Katinić, Marko ; Kozak, Dražan ; Gelo, Ivan ; Damjanović, Darko

Izvornik
Engineering failure analysis (1350-6307) 106 (2019); 104136, 12

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Corrosion fatigue ; Steam turbine ; Corrosion pits ; Blade ; Failure

Sažetak
This paper describes the failure of a rotor of a condensing industrial steam turbine installed in a fertilizer production plant. There was a fracture of the two adjacent rotor blades in their roots. An analysis of the failure cause was carried out, which included the analysis of the fracture location on the steam flow path, the corrosion deposit analysis and the modal analysis of the rotor blades. Modal analysis was performed using the finite element method. It was concluded that the cause of the blades failure was a phenomenon known as corrosion fatigue. To extend the useful fatigue life of rotor blades in the future, the entire turbine stage of broken blades was redesigned. The modified design of the turbine stage has increased the fatigue safety factor by about 50% compared to the original design.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

POVEZANOST RADA