NUMERICAL MODELING OF A STRESS-STRAIN STATE OF A GAS PIPELINE WITH COLD BENDING OFFSETS ACCORDING TO IN-LINE INSPECTION

• Main Authors: KOROBKOV G. E., YANCHUSHKA A. P., ZAKIRYANOV M. V.
• Format: Article
• Language: English
• Published: Saint-Petersburg Mining University 2018-12-01
• Series: Zapiski Gornogo Instituta
• Subjects: gas pipeline; cold bend offsets; modeling; finite element method; stresses
• Online Access: http://pmi.spmi.ru/index.php/pmi/article/view/7751

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 defor-mations in the wall of the offset, which contribute to the overall level of the stress-strain state of the gas pipeline operat-ing 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.