International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Pelton mini hydro-turbine, more concretely its turbine circle buckets was completely damaged during explotation conditions i.e. working time of about two years and half. Because turbine was ensured in ensured company, representatives of the company engaged court expert prof Cvetkovski to perform investigations (analysis) and to determine the reasons for these accidents. Normally working time of the Pelton turbine is about ten years, but there is examples that it can work even twenty years if construction and maintains of turbine was properly done. Therefore, the purpose of the conducted expert examination is to analyze the causes, effects and potential solutions for the damaged Pelton turbine. This report covers the technical aspects, the mechanisms that contribute to the appearance of defects, that is, damage of the buckets of the Pelton turbine. In order to find the reason of failure of the turbine buckets, as first complete visual inspection of the turbine wheel was performed. As additional investigation was performed chemical analysis of the buckets, measuring of its hardness and metallographic investigation (determination of type and quantity of non-metallic inclusion and microstructure).

Considered are the problematic issues of tillage on slopes and presented the methodological aspects of theoretical analysis and experimental research. The production testing of the work of tillage equipment in the circumstances is being taken into account for the conservation of soil fertility. It is considered that the ploughs are often used on sloping lands for primary tillage, although the use of special tools for subsurface of the soil conservation tillage is preferable. Given here are the scientific-theoretical and practical recommendations on the use of the complex contour tillage machines and drainage system in the agriculture fields with complex terrain.