CALCULATION OF PIPELINES STRENGTH DUE TO MECHANICAL INFLUENCE OF ICE

Abstract

Oil and gas pipeline systems contain structures in which ice expansion forces act on the pipes. The force of ice expansion on pipes can be internal and external. The internal force creates a hoop tensile stress in the pipe wall, the external force leads to the appearance of a compressive hoop stress and can lead to loss of stability of the pipe wall. To ensure the environmental safety of pipeline system operation in the oil and gas industry, it is necessary to determine the external and internal pressure on the pipes and evaluate their strength under the influence of ice expansion forces.Aim of research: ensuring environmental safety based on assessing the strength and stability of the pipe wall due to expansion forces of ice.Objects of study: environmental safety, pipeline or its sections under mechanical influence of ice.Research methods: theoretical studies of the stress-strain state of pipes due to external and internal expansion forces of ice.Analytical expressions were obtained to determine the pressure on the pipe surface due to ice formation in the interpipe space, as well as in pipeline cavity. An assessment of the influence of the properties of ice and soil in contact with the pipeline on the pressure values from the ice on the pipeline was made.