PSI - Issue 30

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

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

Procedia Structural Integrity 30 (2020) 11–16

© 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 Abstract The problems of ensuring the operational reliability of underwater crossings for the main transmission of oil and gas are of great importance since failures and accidents on them far exceed similar incidents on the linear part by their economic and environmental consequences. The article describes the determination of the planned-high-altitude position of the lines-I and -II of the underwater crossing of MGL across the Lena river on floodplain areas from the right and left banks by the method of sounding the pipeline with the RD-8000 line locator. The changes in the stress-strain state of the pipeline are defined by monitoring the spatial position with instrumental inspection methods. Based on the survey results, graphs were constructed according to the Baltic system of heights, where the surface of the earth's relief and the main gas pipeline are indicated. The results of field examinations of the I and II lines show that the pipe of the underwater crossing goes almost parallel with the surface relief. No pronounced elevation differences, gullies, and channels are observed on the islands from the right bank of the riverbank. However, there is a change in the planned-high-altitude position of the underwater gas pipeline. A significant change in the planned-high-altitude positions of the I-st and II-nd line siphons of the underwater gas pipeline in the area of the Haptagay channel has been revealed compared to the earlier locations. As a result of such deterioration, the lines can completely freeze in the winter period, and the stiffness of their jamming strengthens. © 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 Keywords: gas pipeline; underwater crossing; line locator; GPR; sonar; pipeline. Abstract The problems of ensuring the operational reliability of underwater crossings for the main transmission of oil and gas are of great importanc ince failures and accidents on them ar exceed similar incidents on the linear part by their economic and environmental onseq ences. The article describes the det rmination of the plan ed-high-altitude position of t lines-I and -II of the underwater crossing of MGL across the L na river on floodplain areas from the right and left banks by the method sounding the pipeline with the RD-8000 line locator. The changes in the st ess-strain state of the pipeline are define by mo itoring the spatial position with instrum ntal inspection methods. Based on the survey resul s, graphs wer constructed according to the Baltic sy tem of heights, where the surface of t e earth's relief and the main gas pipeline are indicated. The results of field xaminations of the I and II lines show that the pipe of the underwater crossi goes a most parallel with t surface relief. No pro ounced elevation iffere ces, gullies, and channels are obs ved on the slands from the right bank of riverbank. However, there is a change in the planned-high-altitude position of the underwa er gas pipeline. A significant chang in the planned-high-altitude positio s of the I-st a d II-nd line siphons of the und rwat g s pipeline in the area of the Hapt gay channel has been reveale compared t t earlier locations. As a result of such deterioration, the lines can comple ely freeze in t e winter period, and th stiffness of heir jamming strengthens. © 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 EURASTRE COLD - 2020 guest editors Keywords: gas pipeline; underwater crossing; line locator; GPR; sonar; pipeline. IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Monitoring of spatial position of the underwater crossing of MGL across the Lena river by instrumental methods A.A. Antonov*, Yu.A. Yakovlev, Z.G. Kornilova, A.L. Tereshkin Larionov Institute of Physical-Technical Problems of the North SB RAS, Oktyabrskaya St. 1, Yakutsk, 677980, Russia IX Eurasian Symposium on the problems of strength and resource in low climatic temperatures (EURASTRENCOLD-2020) Monitoring of spatial position of the underwater crossing of MGL across the Lena river by instrumental methods A.A. Antonov*, Yu.A. Yakovlev, Z.G. Kornilova, A.L. Tereshkin Larionov Institute of Physical-Technical Problems of the North SB RAS, Oktyabrskaya St. 1, Yakutsk, 677980, Russia

* Corresponding author. Tel.: +7-924-465-9741. E-mail address: Santaz7@rambler.ru * Corresponding author. Tel.: +7-924-465-9741. E-mail address: Santaz7@rambler.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 the 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 under the 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 under responsibility of the EURASTRENCOLD - 2020 guest editors 10.1016/j.prostr.2020.12.003