Analysis of the corroded pipeline segments using in-line inspection data

Technical diagnostics of buried gas and oil pipelines is accomplished using magnetic and ultrasonic pigs. At present these methods allow to reveal corroded defects and define their sizes. Simplified techniques that are widely used all over the world for evaluation of the remaining strength of corroded pipeline segments arc conservative and hamper development of the modern in-line inspection tools. The paper presents computation technology for numerical analysis of multiaxial nonlinear stress state of the corroded pipeline segments. All procedures of pipeline numerical analysis are completely automated. Developed computation technology along with the modern in-line inspection tools give the opportunity for the transport company experts to obtain the high accuracy values of burst and maximum available operation pressures of the corroded pipeline segments. It allows to decrease accidents, to provide maximal economical effectiveness of technical inspection and reconstruction of pipeline networks. Moreover, wide application of computation technology allows to give recommendations to the technical diagnostic tool companies for improvement of technical characteristics of their products.