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Information × Registration Number 0215U003471, 0113U002820 , R & D reports Title Development of estimation methods of residual resource of main oil-gas pipe sires at maneuverable regime of their operation with regard on the presence of defects material stats and influence of physico-chemical factors of environment popup.stage_title Head Kushnir Roman Mykhailovych, Registration Date 05-02-2015 Organization Pidstryhach Institute of Applied Problems of Mechanics and Mathematics NAS of Ukraine popup.description2 The analysis and synthesis is carried out for time-changes of exploitation of mechanical and strength characteristics of pipe steels for gas conduit lines. It is elucidated that mechanical characteristics of such steels change insignificantly and the fatigue and strength ones depend significantly on the environment action. A calculation model is formulated relying on which the methods are developed to determine the residual resource of the pipes of gas conduit lines with external surface cracks and their welded joints at long action of internal pressure, corrosive environment and opening- closure of gate valves in the pipe. The residual resource of the pipe and its welded joint of exploited steel X60 with internal surface crack is determined at long pressure action, soil corrosion, watering of the pipe walls and opening-closure of gate valves in the pipe. To this end the diagrams are constructed for corrosion damage of each region of welded joint of exploited steel X60 at different water concentrations. It is shown that opening-closure of gate valves in the pipe and watering of its welded joint decrease significantly the residual durability of the pipe. Product Description popup.authors Андрейків О.Є. Кухар В.З. Кушнір Р.М. Махоркін І.М. Никифорчин Г.М. Яворська Н.В. popup.nrat_date 2020-04-02 Close