ABSTRACT
Issues related to the diagnostics and analysis of the safe use of large-diameter steel technical pipelines located in industrial areas is the subject of the paper. The paper presents the problems of keeping the above-mentioned objects in good condition, their diagnostics and also the analysis of the safe use of such structures located in areas that are particularly exposed to the effects of variable external loads and aggressive chemical factors. The main source of knowledge about the technical condition of large-diameter underground pipelines are direct inspections and inspections carried out in these objects during their operational breaks. In the case of steel pipelines, basic tests that can be performed by users of these networks are measurements of the thickness of the pipeline wall and measurements of their deformations. These are simple diagnostic operations that do not require high qualifications and costly equipment, but allow an overall assessment of the condition of a pipeline. Based on the knowledge obtained at the stage of diagnostic tests, it is possible to perform analysis that allows the wear level of sections of the structural objects exposed to the highest mechanical and non-mechanical external loads to be determined. On the basis of this knowledge, it is possible to plan repair works that will improve the static-strength parameters and protect the structure from further degradation that can lead to failure.
