Technical Diagnostics and Non-Destructive Testing, 2020, №04

2020 №04 (08)

DOI of Article 10.37434/tdnk2020.04.01

2020 №04 (02)

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"Tekhnichna Diahnostyka ta Neruinivnyi Kontrol" (Technical Diagnostics and Non-Destructive Testing) #4, 2020, pp. 3-7

Development of the method for assessment of serviceability and residual life of the main pipelines with service macrodelamination

O.T. Tsiryulnik, N.V. Kret, O.I. Zvirko, G.M. Nikiforchin

G.V. Karpenko Physico-Mechanical Institute of NASU. 5 Naukova Str., 79060, Lviv, Ukraine. E-mail: otsyrulnyk@gmail.com

Expert examination of defectiveness of rectangular elbows/bends of pipes in a compressor station of gas transportation systema fter 40 years of operation and of a linear above-ground section of the main gas pipeline-crossing over water obstacles in a mountain area after 30 years of operation was performed by nondestructive method of ultrasonic testing of pipe wall thickness with application of thickness meter with A/B scan MVX (DakotaUltrasonics). A set of diagnostic indications of hydrogen-induced macrodelaminations inside the pipe wall of a main pipeline was complemented by a new diagnostic electrochemical feature, namely polarization resistance. Its lowering by > 30 % allows prediction of such an enhancement of the stress-strain state on the pipe outer surface, which creates a risk of the macrodefect reaching the surface. A method was developed for evaluation of serviceability and residual life of pipes in a system of the main pipelines with service macrodelaminations, which allows for hydrogen role in the processes of development of such a type of macrodefects, service degradation of metal and application of nondestructive testing methods for controlling the level of metal damage inside the pipes. 10 Ref., 1 Table, 6 Fig.
Keywords: service degradation, steels of the main pipelines, diagnostic features of macrodelamination

Received: 09.07.2020

References

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This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Suggested Citation

O.T. Tsiryulnik, N.V. Kret, O.I. Zvirko, G.M. Nikiforchin (2020) Development of the method for assessment of serviceability and residual life of the main pipelines with service macrodelamination. Technical Diagnostics and Non-Destructive Testing, 04, 3-7. https://doi.org/10.37434/tdnk2020.04.01

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