Methodology of experimental determination of dependability indicators when performing static bending tests of ball valves

Abstract. The quantitative indicators of the dependability characteristics of process equipment, machines and entities include the reliability, maintainability, durability, storability. The Aim of the research is to develop a methodological framework of experimental determination of dependability indicators when performing static bending tests of ball valves. The aim is to be achieved by solving individual scientific problems, namely the development of the method of static bending testing of ball valves, experimental determination of the destructive test coefficient, analytical calculation of the coefficients of failure, efficiency preservation and product quality. A test stand was developed for experimental determination of the destructive test coefficient. The employed scientific methods of static testing are suggested for the first time ever. The minimal bending test load is the defining value, therefore the experimental work requires a large sample. Additionally, for the ball valve with the lowest endured bending load out of the tested items of the same diameter, it is recommended to use a specially developed methodology to identify such valve as solid-state monolithic units. The conclusions of the conducted experimental and theoretic research are in compliance with the solved research and development objectives. By conducting the experimental research, the authors evaluated the “enhanced” capabilities of ball valves by various manufacturers through comparative analysis of the conducted static bending tests. It is recommended to consider a solid-state monolithic unit along with the operation as part of a pipeline made of a certain material. The destructive test coefficients for the examined ball valves were experimentally determined. Efficiency preservation coefficients were identified that are the basic coefficients of the dependability indicator, that, in turn, is one of the primary dependability characteristics of process equipment, machines and entities.

ball valve, dependability, static testing

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