PSI - Issue 28

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 28 (2020) 1795–1801

© 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 European Structural Integrity Society (ESIS) ExCo Abstract This paper is concerned with an experimental investigation of vibrations occurred in gas pipelines under different impact loads. The mechanical state of these objects is determined by the interaction between the processes taking place in the metal pipe, the ground in the vicinity of the pipe and the gas flow inside it. In the experiments, different pipeline vibration modes were investigated. Application of fiber-optic accelerometers made it possible to record vibrations from shutoff valves, as well as gas leak-generated vibrations. It was found that the loads applied to the pipe wall or surrounding soil induced pipe vibrations in the local region near the impact site (the signal effective distance is about 60 meters). A much stronger effect on the pipe wall was exerted by the jumps in pressure via the shut-off valves (the distance measurement of 2 km). The data obtained can be used to construct a structure diagram for the online monitoring system needed to control the deformation state of gas pipelines, to assess the sensitivity of sensors to various factors, and to verify the available mathematical models describing vibration processes in 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) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: gas pipeline, vibration diagnostic, deformation monitoring, shock impacts, gas leaks 1. Main text Risk assessment for main gas pipelines requires an accurate analysis of their mechanical state. Pipelines are usually exposed to long-term and short-term loads associated with the influence of various external factors or the operation of the accompanying equipment (changes in the mode of gas transport, operation of valves, movement of in-line 1st Virtual European Conference on Fracture Experimental Study of Dynamic Deformation Processes in Gas Pipeline I. Shardakov a , I. Glot a *, A. Shestakov a , R. Tsvetkov a a Institute of Continuous Media Mechanics, Russian Academy of Science, Perm, 614018, Russia

* Corresponding author. Tel.: +7-342-237-8318; fax: +7-342-237-8487. E-mail address: glot@icmm.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 European Structural Integrity Society (ESIS) ExCo

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 European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.001