Abstract
Background During operation to ensure the strength of pipeline sections of trunk oil and gas pipelines with external corrosion, couplings are widely used. The coupling installed on the corroded part of the pipeline takes up part of the load of the internal pressure, ensuring that this load is reduced by the reduced wall thickness due to corrosion. Coupling installation can be fulfilled with the tension of its wall and in the presence of internal pressure in the pipeline. Thereby, the efficiency of the corroded pipeline section is achieved. At the same time, coupling installation leads to a change in the stress-strain state of the pipeline sections adjacent to the coupling with the appearance of local bending stresses. With all this, the level of mechanical stresses in the walls of the corroded section of the pipeline and coupling during operation should not exceed the normative. In order to ensure the strength of the repaired sector, it is necessary to determine the maximal stresses in the walls of pipeline and coupling depending on their geometrical characteristics and installation conditions and after that to conduct a strength test in accordance with the requirements of SP 36.13330-2012. Aims and Objectives To obtain analytical dependences of the maximal stresses in the wall of the coupling and the pipeline arising from the action of internal pressure, depending on their geometrical characteristics and installation conditions of the coupling. Methods Theoretical research of pipeline corroded section and repair coupling stress-strain state during operation. Results The dependences of the stresses in the coupling wall and pipeline on their geometric characteristics, coupling installation conditions and internal pressure are obtained.
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