«Proceedings of Gubkin University»

Strength conditions of main elements of oil and gas pipelines

UDC: 622.242
DOI: 10.33285/2073-9028-2023-1(310)-134-144

Authors:

¹ Gubkin Russian State University of Oil and Gas (National Research University), Moscow, Russian Federation

Keywords: strength, pipeline, equivalent stresses, pipeline elements, radius of curvature of pipelines, thickness of pipeline elements

Annotation:

The article discusses methods for calculating the strength of the main elements of oil and gas pipelines with small radii of rounding in the conditions of tectonic faults of the earthen soil. The strength criterion is the Mises energy criterion, which does not depend on the average stress, that is, on the linear invariant of the stress tensor. The main elements of pipelines in a rough approximation can be considered thin-walled elements. Therefore, the calculations use the Laplace equation, which determines the equilibrium of a thin-walled shell of double curvature. Formulas for determining the maximum equivalent stresses in steeply curved pipelines are derived. In order to obtain from these formulas, the calculation formulas of the strength reliability of pipelines, it is proposed to replace in them the operating stresses with permissible stresses. At the same time, factors depending on the conditions of the technological process are taken into account, that is, temperature, welding methods and its control, the accuracy of the joining of the connected elements and other factors. Calculated dependences are derived for determining the safe wall thickness of pipelines with small radii of rounding, plugs with holes and without holes, as well as tee fittings.

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