EXPERIMENTAL DETERMINATION OF THE CORROSION ENCRUSTATION VALUE IN STEEL GAS PIPELINES

Abstract

Statement of the problem. The operating experience of gas pipelines and gas distribution networks shows that despite the almost complete protection of gas pipelines from corrosion by passive and active methods, more than 55-60 % of the damage detected during the diagnostics process is caused by damage of various corrosive nature. Finding the residual resource of pipelines is a pressing issue in the context of limited funding. The aim of the study is to conduct a detailed analysis of statistical data on internal corrosion of gas pipelines and to assess the magnitude of corrosion overgrowth of used gas pipelines using the developed method of diagnostics and assessment of the condition of pipes using a probabilistic approach to risk assessment.Results. The article presents the results of experimental measurement of the magnitude of corrosionovergrowth of steel gas pipelines, the regularities of changes in the diameter of the gas pipeline, the values of corrosion protrusions are obtained, the probability of their occurrence and their repeatability are numerically estimated. The processing of the measurement results of the overgrowth of steel gas pipelines was carried out using the methods of mathematical statistics, as a result, the probabilistic numerical characteristics of the investigated parameters of the gas pipeline were obtained. Conclusions. The histograms of the distribution of amplitudes, built on the basis of experimental data, confirm that the modal values of the heights of corrosion protrusions are shifted to the region of small values. Analysis of the results obtained allows us to conclude that the corrosion parameters are consistent with the Charlier probability distribution. When inspecting gas pipelines, the coefficient of variation exceeding 75 % indicates a decrease in the flow area of the pipe, a decrease in the quality of operation and the condition of gas pipelines.