Analysis of the causes of fracture of the main gas pipeline

Lyudmila Nyrkova; Anatolii Rybakov; Larysa Goncharenko; Svetlana Osadchuk; Yulia Kharchenko

doi:10.5937/zasmat2302177N

Autori

Lyudmila Nyrkova E.O Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine Autor
Anatolii Rybakov E.O Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine Autor
Larysa Goncharenko E.O Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine Autor
Svetlana Osadchuk E.O Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine Autor
Yulia Kharchenko E.O Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, Kyiv, Ukraine Autor

DOI:

https://doi.org/10.5937/zasmat2302177N

Ključne reči:

magistralni cevovod, čelik X70, mikrostruktura, mehanička svojstva, naponskokoroziono pucanje, katodna zaštita

Apstrakt

Sproveden je kompleks istraživanja za utvrđivanje uzroka havarije magistralnog gasovoda od čelika 1420x15,7 mm X70 nakon 20 godina rada. Utvrđeno je da je destrukciju cevi inicirala uzdužna pukotina dužine 470 mm i maksimalne dubine 6,8 mm, orijentisana u pravcu cevi i okomita na spoljašnju površinu cevi koja je identifikovana kao prslina od naponske korozije. Nastanak pukotine je usled odvajanja zaštitnog premaza trake, visoke aktivnosti korozije tla i složenog naponsko-deformacionog stanja uzrokovanog odstupanjima od projektnih ciljeva tokom izgradnje. Hemijski sastav osnovnog metala svih ispitivanih cevi odgovara zahtevima tehničkih uslova za čelične cevi kategorije X70; zavarivanje cevi se izvodi tipičnim materijalima koji se koriste u postrojenjima za zavarivanje cevi. Uprkos razlikama, strukturne i mehaničke karakteristike (napor tečenja, krajnja čvrsto a i udarna čvrsto a) čelika i metala šava ispitivanih cevi su identične. Relativno izduženje (d5) ispitivanih cevi je ispod normalizovanih vrednosti, ali je potrebno uzeti u obzir mogućnost odstupanja ovih karakteristika čelika u početnom stanju. Značajne rezerve žilavosti indirektno ukazuju na nisko oštećenje metala i, shodno tome, na zadovoljavaju u otpornost na destrukciju metala ispitivanih cevi.

Reference

*** Steel electric welded pipes with longitudinal weld expanded 1420 mm in diameter from the X-70 grade steel: Technical specifications. TS 14-3-995-81

*** Pipe mains. BR 2.05.06-85 Building Regulations

Kentish, P.J. (1985) Gas pipeline failures: Australian experience.British Corrosion Journal, 20(3): 139-146

https://doi.org/10.1179/000705985798272786

Kotrechko, S.A., Krasovskii, A.Y., Meshkov, Y.Y., Polushkin, Y.A., Torop, V.M. (2002) Influence of long-term operation on the toughness of 17GS pipeline steel.Strength of Materials, 34(6): 541-547

https://doi.org/10.1023/A:1022066316622

Leis, B.N. (1991) Some aspects of stress-corrosioncracking analysis for gas transmission pipelines. in: Materials Performance Maintenance, 107-121

https://doi.org/10.1016/B978-0-08-041441-6.50014-X

Nykyforchyn, H., Unigovskyi, L., Zvirko, O., Tsyrulnyk, O., Krechkovska, H. (2021) Pipeline durability and integrity issues at hydrogen transport via the natural gas distribution network.Procedia Structural Integrity, 33: 646-651

https://doi.org/10.1016/j.prostr.2021.10.071

Nyrkova, L. (2020) Stress-corrosion cracking of pipe steel under complex influence of factors.Engineering Failure Analysis, 116: 104757-104757

https://doi.org/10.1016/j.engfailanal.2020.104757

Nyrkova, L.I., Rybakov, A.O., Osadchuk, S.O., Melnichuk, S.L., Hapula, N.O. (2014) Method for tests of sensibility of pipe steels to stress-corrosion cracking from the influence of alternating wetting.Patent for Invention, 107381(2); publ. 10.12

Ossai, C.I., Boswell, B., Davies, I.J. (2015) Pipeline failures in corrosive environments: A conceptual analysis of trends and effects.Engineering Failure Analysis, 53: 36-58

https://doi.org/10.1016/j.engfailanal.2015.03.004

Polyakov, S.G., Rybakov, A.A. (2009) The main mechanisms of stress corrosion cracking in natural gas trunk lines.Strength of Materials, 41(5): 456-463

https://doi.org/10.1007/s11223-009-9164-x

Pyatnichko, A.I., Krushnevich, T.K. (2008) The main directions of improvement of the gas transportation system of Ukraine.Technical gases, 3: 9-14

Ya, A., Krasovskii, I.V., Lokhman, I.V., Orynyak (2012) Stress-corrosion failures of main pipelines.Strength of Materials, 44: 129-143

https://doi.org/10.1007/s11223-012-9366-5

Ya, A., Krasovskii, I.V., Orynyak (2010) Strength and reliability of piping systems.Strength of Materials, 42(5): 613-621

https://doi.org/10.1007/s11223-010-9249-6

Zhao, Y., Song, M. (2016) Failure analysis of a natural gas pipeline.Engineering Failure Analysis, 63: 61-71

https://doi.org/10.1016/j.engfailanal.2016.02.023