Abstract
Background On the curved sections of underground oil and gas pipelines under internal pressure and temperature drop the longitudinal and transverse movements of the pipeline occur. Pipeline movements lead to deviation from the design profile and to uprise of significant longitudinal stresses in the pipe wall. Aims and Objectives To assess the impact of continuous weight coating of the underground pipeline curved section on mechanical stresses in pipe wall and the margin of safety. Methods Analytical studies of pipeline movements and stresses and analysis of safety margins. Results Analytical dependences of pipeline movements and maximum stresses were obtained, as well as the margin of safety was calculated depending on internal pressure, temperature drop, the intensity of the continuous weight coating, pipeline geometry, properties of its metal and properties of soil, interacting with the pipeline.
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