The article determines the critical parameters of the oil fraction-temperature, pressure and density. The experimental results are compared with the calculated results, the calculation method closest to the experimental results is chosen, the calculation error is estimated. The main results and conclusions are presented. The use of the theory of thermodynamic similarity in the method of density calculation and DNP required first of all knowledge of the parameters of the state at the critical point. The accuracy of the calculation of critical parameters affects the reliability of the results.
The present paper describes the method of frequency optimization for oil service operations regarding technical maintenance of combine harvesters RSM “TORUM-740”. Theoretical background for the estimation of optimal period for oil service that would minimize total losses is considered. When improving oil service, the failures belonging to the following groups are taken into account: strength breaks and predictive failures. The present paper is recommended for experts in agriculture, scientists, academicians, masters and students of agricultural engineering department of agricultural universities.
The results of experimental studies of gasoline and petroleum fractions are discussed in the article, as well as their main physical and chemical properties, density and pressure of saturated vapors, liquid phase, two-phase region, critical region, and boundary curves. The article is recommended for agricultural specialists, researchers, teachers, graduate students, undergraduates, and students of agricultural universities in the field of “Agricultural Engineering”.
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