Sewage systems are an important component of the life support system, which, in particular, determine the ecological condition in the settlement. The durability of the laid network depends on many factors, one of which is their corrosion resistance. The number of accidents on the site and the number of necessary repairs are also related to this factor. The purpose of the work was to study the factors that have the greatest influence on the corrosion resistance of sewer pipelines, with the aim of increasing their service life and reducing the number of accidents. The analysis used information obtained during the practical operation of sewer pipelines in the city of Kyiv. The data of a group of pipelines with diameters from 500 to 1500 mm were analyzed. The planning of the active experiment was made on a sample of data for 25 years of operation. The presented study was carried out in the statistical package STATGRAPHICS. A full factorial experiment was conducted. According to the results of the work, the total number of determining factors was reduced. Based on the methods of statistical analysis, the following conclusions were obtained: a statistically significant relationship was established between the use of concrete pipes with low speed and the largest number of pipeline accidents. The material of the pipeline and the speed in it turned out to be the factors that have the greatest influence on the life of the pipeline and the number of accidents on the pipeline.
The durability and reliability of operation of steel pipelines of water supply and sewage systems is determined in particular by the quality of their welded joints, which in turn depends both on the composition of the materials used in their manufacture and on the observance of welding technology. The composition of impurities of transported liquids, which can cause corrosive destruction of materials, also has a significant impact on the reliability of pipeline systems. These phenomena are especially important in hot water supply and industrial drainage systems, where the destructive influence of physical factors and the chemical composition of the environment can be decisive. It was found that the loss of strength of the pipeline is caused in particular by improper operation, under the conditions of which micro-flaws of welded joints of pipelines appear, which leads to their destruction. The results of examinations and experimental studies of the strength of welds of steel process pipelines are presented. An external inspection was carried out, determination of the structure and strength parameters of pipeline welds, layer-by-layer analysis of corrosion damage on their inner surface. It was found that premature destruction of welded joints of hot water supply pipelines and industrial sewage is caused by long-term operation in a stressed state. Under such circumstances, the uneven coarse-grained structure of the seam, the presence of non-metallic inclusions in the metal structure, and violations of the welding technology had a critical impact on the loss of strength. In order to increase the corrosion-mechanical resistance of welded joints of industrial pipelines, it is necessary to modify the surfacing metal of the weld to break down the structure and significantly reduce non-metallic inclusions, as well as to improve the technology of manual arc welding with coated electrodes, in particular, the root layers of welding seams.
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