TPWJ, 2020, #9, 4-13 pages
Numerical methodology of prediction of the reliability and residual life of welded pipeline elements with corrosion-erosion defects
O.S. Milenin, O.A. Velykoivanenko, G.P. Rozynka and N.I. Pivtorak
E.O. Paton Electric Welding Institute of the NAS of Ukraine
11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: email@example.com
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 interrelated processes of thermal deformation at assembly and
repair welding, as well as initiation and propagation of subcritical damage of the defective structure material in 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 Tables, 12 Figures.
pipeline, defect of corrosion-erosion metal loss, welded joint, limit state, reliability, fracture probability,
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