Purpose. Determination of the stress state and visualization of spatial stress distribution along the main pipeline section under operating conditions, which will make it possible to advise on the way for pipeline repair and recovery with provision of the structural integrity. Methodology. Mathematical model for determining the main pipeline stress-strain state, which relates the stress value at a control point to speed variation of ultrasonic waves propagating in mutually perpendicular directions, was described on the basis of the acoustoelasticity laws and acoustic theory. Stress spatial distribution was modeled on a pipeline section using the computer algebra system. Findings. The choice of approach to the spatial representation of the pipeline stress state was justified; basic steps and mathematical relationships to determine the stress state of the pipeline section were described. The results obtained were confirmed in practice. Their interpolation and visualization as continuous surface allows simulating the stress state between the control points on the pipeline surface. Originality. The way of determining the data of the stress-strain state of main pipelines, their processing, visualization and adequate interpretation of the situation in terms of repairs was developed. Practical value. The algorithm of pipeline wall stress determining along three mutually perpendicular directions is presented. The method of visualization of the spatial stress distribution both along the normal pipeline crossing and the main pipeline section was proposed, which allows non-destructive testing results to be used under operating conditions. This is especially important for dangerous sections of gas pipelines and pipeline systems, whose failure can result in environmental pollution and accidents with drastic consequences.

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