ANALYSIS OF THE TOTAL RESISTANCE OF UNDERWATER PIPELINES IN LONGITUDINAL DIRECTION

Abstract

Background The loss of stability of oil and gas pipelines is accompanied by significant deviations from the design position with the occurrence of excessive, often unacceptable mechanical stresses in the pipe wall and their damage. Damage to pipelines for pumping oil, oil products and gas is associated with high costs. The loss of the underwater pipelines overall stability in the longitudinal direction and their damage is associated with even higher costs and requires a separate analysis. In this case, it is necessary to take into account the possible erosion under the action of the water flow of the soil backfill over the pipeline laid in the trench, which affects the stability of the pipeline. Aims and Objectives Obtain analytical expressions for the determination of the longitudinal compressive critical force at which the loss of longitudinal stability of the underwater pipeline laid in a trench and covered with soil in conditions of erosion of backfill in a certain area occurs. Results The dependence of the critical force resulting in the loss of the longitudinal stability of the underwater pipeline, on the extent of the blurred section, the geometric characteristics of the pipes, its weight with the pumped product and the load, and the properties of the soil in contact with the pipeline is obtained.