In the paper, the technical risk has been evaluated for the sewage network of a city in Southern Poland. The basis for calculations were field studies concerning operation of the said network, with the focus on technical data (network type, length, materials, size) and the failure rate information (type and duration of failure, unwanted event frequency). A two-dimensional matrix for failure risk in the pipelines was prepared with consideration to the type of pipeline and the material, as well as a risk map for pipeline malfunction. Obviously, the number of factors may be extended. In order to perform such analyses and add new factors, an appropriate database is needed, while in the case of sewage systems there is still little data collected. The evaluated risk of failure for the studied network was discovered to be in the tolerated and controlled-risk groups. The matrices and technical risk maps can prove to be useful in the process of optimizing the operation of the sewage network, e.g. in planning and executing repair works.
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Wzrastająca presja środowiskowo-społeczna silnie ogranicza możliwości budowy nowych linii napowietrznych, szczególnie na terenach miejskich. Ulepszanie materiałów i elementów linii kablowych oraz stosowanie coraz doskonalszych konstrukcji kabli i osprzętu prowadzi do znacznego obniżenia kosztów instalowania linii kablowych w porównaniu z kosztami budowy równoważnych linii napowietrznych.
EN
Increasing environmental pressures makes building new overhead lines more and more difficult, especially in urban areas. lmprovements in materials, equipments and design of cables and accessories can lead to a significant reduction in total cost of underground cable systems, making them more competitive with overhead lines in urban areas.
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