2020 №09 (08) DOI of Article
2020 №09 (02)

Automatic Welding 2020 #09
Avtomaticheskaya Svarka (Automatic Welding), #9, 2020, pp. 11-21

Numerical methodology of prediction of the reliability and residual life of welded pipeline elements with corrosion-erosion defects

O.S. Milenin, O.A. Velikoivanenko, G.P. Rozynka, N.I. Pivtorak
E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

A set of procedures, mathematical models and tools for their finite-element realization were developed, to solve typical practical tasks of expert analysis of the technological condition and residual safe operating life of welded elements of the main and technological pipelines with defects of corrosion-erosion metal loss detected during diagnostics. In order to lower the conservativeness of analysis, the inter-related processes of thermal deformation at erection and repair welding, as well as initiation and propagation of subcritical damage of the defective structure material by the ductile mode in operation under complicated temperature-force conditions of external impact, were taken into account. Procedures of statistical analysis of fracture susceptibility of welded pipelines were developed on the base of Weibull and Monte-Carlo methods, and adequacy of the developed computational methods was confirmed. Peculiarities of the effect of welding on the reliability and serviceability of the main and technological pipelines with detected defects of corrosion-erosion metal loss were determined, in order to develop minimally conservative recommendations as to the possibility of safe operation of the pipelines. 18 Ref., 2 Tabl., 12 Fig.
Keywords: pipeline, defect of corrosion-erosion metal loss, welded joint, limit state, reliability, fracture probability, ductile fracture

Received: 19.08.2020


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