TY - JOUR N2 - The aim of this paper is twofold: to estimate the unsteady pressure-flow variations in gas transmission pipelines using the ensemblebased data assimilation approach and to analyse the strength of steel tubes reinforced with composite sleeves containing localized part-wall thickness loss caused by corrosion while taking into consideration a safe operating pressure of the pipeline. For a steel thin-walled cylinder containing a partwall metal loss, a flexible wrap of fibreglass as well as carbon glass with epoxy resin are determined. The strength of the repaired pipeline with two kinds of materials for sleeves is investigated taking into consideration the internal pressure at the defect location. For the case study, a section of the Yamal transit pipeline on the Polish territory is selected. The results enable pipeline operators to evaluate the strength of corroded steel pipelines and develop optimal repair activities, which are of vital importance for the maintenance and operation of underground steel networks. L1 - http://www.journals.pan.pl/Content/118774/PDF/art01.pdf L2 - http://www.journals.pan.pl/Content/118774 PY - 2020 IS - No 4 EP - 22 DO - 10.24425/ather.2020.135852 KW - Pipe wall metal loss KW - Composite sleeve KW - Pipe fracture KW - Gas dynamics KW - Data assimilation A1 - Witek, Maciej A1 - Uilhoorn, Ferdinand PB - The Committee of Thermodynamics and Combustion of the Polish Academy of Sciences and The Institute of Fluid-Flow Machinery Polish Academy of Sciences VL - vol. 41 DA - 2020.12.30 T1 - A data assimilation approach for estimating strength of steel pipes reinforced with composite sleeves under unsteady pressure-flow conditions SP - 3 UR - http://www.journals.pan.pl/dlibra/publication/edition/118774 T2 - Archives of Thermodynamics ER -