Abstract
Background Analysis of existing approaches to estimation of pipeline safe service life shows that the literature has not enough information about adequate assessment of influence exerted by localized of the pipe wall shape and thickness distortions on safe operation characteristics (the number of load cycles before and during the failure). In particular, it is shown that the existing approaches to estimation of safe service life of pipes with localized distortions of shape (dents) may several times underestimate safe life of a pipeline. The fact makes necessary to study how localized mechanical effects influence on serviceability and safety of oil pipeline main elements. Aims and Objectives The present work is devoted to research and development of the methods of estimating the resistivity to brittle and ductile failure of pipes with localized changes in the net opening. Methods The work presents results of analysis of the stressed state of pipes with angular dents, using the boundary problem approach and the theory of thin shells of revolution. Results Proposed and justified is the method of calculating the strength factor of pipes with multi-parameter crack-like damages caused by interaction with rocky ground. Obtained results serve the base for calculation of predicted and remained life of pipelines and their basic elements.
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