PSI - Issue 30

Available online at www.sciencedirect.com Available online at www.sciencedirect.com Sci nceD rect StructuralIntegrity Procedia 00 (2020) 000–000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2020) 000–000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 30 (2020) 144–148

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors The article presents the results of the investigation of the mechanical properties of the base metal and welded joints of the underground main gas pipeline with a diameter of 529 mm operating in permafrost soils. Test samples were cut from pipe fragments of different sections of the Taas-Tumus-Yakutsk gas pipeline after fifty years of operation. The investigated pipes were made of 09G2S low-alloy steel. The obtained results of the mechanical testing of the samples were compared with the data of the certificates for pipes, which were determined based on the results of spectral analysis. A decrease in the values of relative elongation and impact strength of the base metal has been established is comparison with the data of the certificate. The investigation of changes in the properties of pipe steels during long-term operation has made it possible to evaluate the technical condition of the pipe material and to develop forecasts regarding the prospects for the further safe operation of existing gas pipelines. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) The article presents the results of the investigation of the mechanical properties of the base metal and welded joints of the underground mai gas pipeline wit a diameter f 529 m operating in mafr st soils. Test s mples er cut from pip fragments of different sectio s of e Taas-Tumus-Yakutsk gas pipeline aft fifty years of operation. The investigated pipes were made of 09G2S low-alloy steel. The obtained results of the mecha ic l t sting of the sampl s were compared with the data of the certificates for pipes, which were determined based n results of sp c ral analysi . A d creas in the values of relative elongation and impact strength of th bas etal h s been established i comp rison with the data of the certificat . Th investigation of changes in the pr perties of pip steels during long-term operation ha made it possible to evaluat he technical condi on f the pipe material and to develop for ca ts regardi he prospects for the further afe operation of existing g s pipel nes. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der re ponsibility of EURASTRE COLD - 2020 guest editors K ywords:pipeline; m chanical properties; low-alloy steel; degradation; welded joint. IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Investigation of mechanical properties of the main gas pipeline material during a long-term operation in conditions of the North Igor Sannikov a, * * , Nikolay Golikov a , Nikolay Terentyev b , Pavel Ksenofontov c , Aisen Zhirkov c a Larionov Institute of Physical-Technical Problems of the North SB RAS, 1 Oktyabrskaya St., Yakutsk, 677980, Russia IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Investigation of mechanical properties of the main gas pipeline material during a long-term operation in conditions of the North Igor Sannikov a, * * , Nikolay Golikov a , Nikolay Terentyev b , Pavel Ksenofontov c , Aisen Zhirkov c a Larionov Institute of Physical-Technical Problems of the North SB RAS, 1 Oktyabrskaya St., Yakutsk, 677980, Russia b LLC " Gasexpertservis", 1 Zodchikh Ln., Yakutsk, 677021, Russia c JSC "Sakhatranstreftegaz", 18 Kirova St., Yakutsk, 6 7027, Ru sia b LLC " Gasexpertservis", 1 Zodchikh Ln., Yakutsk, 677021, Russia c JSC "Sakhatranstreftegaz", 18 Kirova St., Yakutsk, 677027, Russia Abstract Abstract Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors Keywords:pipeline; mechanical properties; low-alloy steel; degradation; welded joint.

* Corresponding author. Tel.: +7-411-2358-869; fax: +7-411-2358-869. E-mail address: i.i.sannikov@mail.ru * Corresponding author. Tel.: +7-411-2358-869; fax: +7-411-2358-869. E-mail address: i.i.sannikov@mail.ru

2452-3216© 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors 2452-3216© 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der responsibility of t EURASTRE COLD - 2020 guest editors

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the EURASTRENCOLD - 2020 guest editors 10.1016/j.prostr.2020.12.022