Gennady Korobkov, Doctor of Engineering Sciences, Professor, Ufa State Petroleum Technological University, Russian Federation;
Anna Yanchushka, Candidate of Economic Sciences, Associate Professor, Ufa State Petroleum Technological University, Russian Federation;
Mars Zakiryanov, Postgraduate Student, Ufa State Petroleum Technological University, Russian Federation.
Abstract
Knowledge of the current stress-strain state of any section of the pipeline allows you to make informed decisions on its operation, maintenance and repair, as well as on the prediction of the technical condition. The task of determining the characteristics of the stress-strain state of a gas pipeline section that has cold bend offsets (CBO) according to in-line inspection (ILI) is considered. The bent part of CBO is characterized by the presence of residual stresses and deformations in the wall of the offset, which contribute to the overall level of the stress-strain state of the gas pipeline operating under external and internal loads. Using the results of in-line diagnostics, numerical modeling and a solution, the change in the values of longitudinal stresses, is determined and the need to take into account residual stresses in the zone of elastic-plastic deformations of cold bend offsets is shown.
Keywords: gas pipeline; cold bend offsets; modeling; finite element method; stresses.
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Scientifiс periodical «Zapiski Gornogo Instituta / Journal of Mining Institute» has been published since 1907 as a periodical scientific and scientific-educational edition in Saint-Petersburg Mining University. The periodicity of publishing is 6 volumes per year.
