Recommendation for a new model of the maintenance system of turbine and hydromechanical equipment at the hydro power plant Djerdap 1

Abstract

Turbine and hydro mechanical equipment at hydro power plant ’Djerdap 1’ is subjected to service conditions that lead to degradation of material of components and structures. Taking into account the rate of occurrence of failures (damages, accidents) and experience gained through long-term performing of tests it was established that main causes of material degradation are fatigue, corrosion, erosion and cavitation. Results of performed tests and researches carried out in order to identify the causes of material degradation, damaging and fracture of components and structures of turbine and hydro mechanical equipment during the rehabilitation of the hydro power plant ’Djerdap 1’ showed that material degradation, damages and fractures occur due to the simultaneous influence of a large number of technological, metallurgical, structural and exploitational factors and that convenient structural solutions which would ensure mechanical reliability of components and structural integrity could be achieved only through absolute knowledge of their behaviour under various regimes of operation. On the basis of those results new system for maintenance of components and structures of turbine and hydro mechanical equipment was recommended.