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Information × Registration Number 0220U101699, 0119U101135 , R & D reports Title Development of the method of an evaluation of workability and residual life time of main pipelines with in-service macrodelamination popup.stage_title Head Tsyrulnyk Oleksandr T., Registration Date 18-02-2020 Organization Karpenko Physico-Mechanical Institute of NASU popup.description2  The defectiveness expertise of the liner overground part of 30 years operated gas trunk – the water barrier in the mountain area – was carried out by the nondestructive ultrasonic method of a control of pipe wall thickness. The ultrasonic thickness meter with A/B scan MVX (Dakota Ultrasonics) was used. The complex of diagnostics features of hydrogen assisted macrodelamination inside of pipe wall of main pipeline is supplemented with the new diadnostics electrochemical feature, namely, polarization resistance. Its decrease more 30% allows to predict such increase of stress-strain state on external pipe surface which provides a danger of exit of macrodefect on surface. Two defects of delamination type are revealed in the pipe wall of the linear overground part – the water barrier in the mountain area – 30 years of operated gas trunk which were eliminated by round welds. Product Description popup.authors Voloshyn Vitaliy A. Hredil Myroslava I. Zvirko Olha I. Kret Natalia V. Krechkovsʹka Halyna V. Kurnat Ivan M. Nykyforchyn Hryhoriy M. Khabursʹkyy Yaroslav M. Tsyrulnyk Oleksandr T. popup.nrat_date 2020-04-02 Close