With the aim to determine the effects of mining on the damage frequency of steel pipelines, one compares the value of indexes that characterise the damage frequency of networks located in mining areas with those determined for areas not affected by mining. However, to compare these indexes is generally difficult by reason of substantial diversification of the obtained values of those indexes, even for the same kind of pipelines constructed in similar conditions. So far, no analyses have been performed in relation to the effects of mining on the corrosion frequency of damage of steel pipelines. To perform this, an analysis has been made of the damage frequency of water-supply pipelines in the selected areas, by making use of the data obtained from Regional Water and Sewerage Enterprise, Katowice, with specification of due to corrosion of pipes. The average values of unitary frequency of damage obtained in mining areas are higher than those values in comparative areas, not affected by mining. The share of mining in the damage frequency of steel water pipelines was estimated by comparing these frequencies. The determined values of the Wgk index of share in corrosion damage frequency of steel pipelines for selected comparative areas range from 0,34 to 0,56 (average 0,47). However, these values must be considered approximate, among other things, by reason of substantial diversification of damage frequency within each area, either affected or not by mining. In consequence of this, further studied are recommended in this field. With the aim to determine the values of the index of share of mining in corrosion damage frequency of steel pipelines for other areas than considered in the paper, a comparative analysis of their damage frequency with that for pipelines not affected by mining must be made. The analysis performed of damage frequency of steel pipelines indicates that the effects of mining contribute to the increased number of corrosion damage of steel pipelines. Mining-induced deformations of the ground give rise to additional stress in the pipe walls, which entails additional stress-related corrosion. The friction of the ground against the external surface of pipelines, together with their deformations and displacements may additionally produce damage to their anti-corrosion insulation, which considerably facilitates the process of corrosion of these pipelines.
Impact of mining exploitation onto failures of steel pipelines
Einfluss bergbaulicher Tätigkeiten auf die Häufigkeit der Schäden an Stahlrohrleitungen
2009
11 Seiten, 6 Bilder, 3 Tabellen, 21 Quellen
Conference paper
English
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