PSI - Issue 20

ScienceDirect Available online at www.sciencedirect.com ScienceDir t Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com cienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2018) 000 – 000

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Procedia Structural Integrity 20 (2019) 53–56

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 e uthor(s). Published by Elsevi er B.V. Peer-revie under responsibility of the I -2019 organizers © e uthor(s). Published by Elsevi er B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevi er B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Autho ( ). Published by Elsevi er B.V. Peer-review under responsibility of the ILEE-2019 organizers © 2019 The Author(s). Published by Elsevi er B.V. Peer-review under responsibility of the ILEE-2019 organizers 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Influence processes freezing and thawing of permafrost soils on underground pipeline’s stress -strain state Oleg Naumov , Gennady Moskvitin, Yulia Grigorieva A.A. Blagonravov Mechanical Engineering Research Institute of RAS (Russian Academy of Sciences),Bardina street 4,Moscow,119334,Russia Abstract The positions of the underground routing pipeline under conditions of the effect of the freeze-thaw processes in the permafrost soils are simulated in the paper. The change in seasonal temperatures leads to the emergence of thermokarsts, heaving and soil failures along the oil pipeline route, which negatively affects the performance of the object. The paper presents the calculation of 520 mm outer diameter (355 JR steel), 30 m length oil pipeline of underground routing (1.5 m depth of burial) in the permafrost soil conditions, which runs 25 ⁰ C temperature oil under 5 MPa pressure, with 0 ⁰ C temperature pipe casing. Modeling carried out in SolidWorks software using Simulation package. The stress-strain state and travels occurred during the seasonal changes in the soil are determined. According to the results of the study, the methods of reducing the influence of freezing and thawing processes to prevent the negative impact of mm soils on the oil pipeline are proposed. 1. Introduction In the Russian Federation, a great number of the oil and gas fields and oil pipelines (including ESPO-2 (Eastern Siberia - Pacific Ocean) and “Power of Siberia”) are located in the permafrost zone (Yakutia, Komi, etc.). The key feature of this zone is the existence of the seasonal freeze-thaw processes that causes the appearance of the thermokarsts, heaves and sags (see Fig. 1). These events result in the change in the geometric position of the oil pipeline that can cause the emergencies as well as oil and oil product spillages by Naumov et al. (2016, 2019). In order to decrease the probability of the emergency appearance, the small diameter pipes are used with underground routing. This method is an economically feasible one compared with the above-ground routing on the supports; the crucial travels of the oil pipeline do not occur in the case of the above-ground routing. However, there are a number of difficulties during operation. The underground routing pipelines are pressed down with the soil; it affects adversely the facility performance as shown by Borodavkin (1982), Ivantsov and Kharionovskiy (1978). The temperature change leads to the heave appearance, due to which the ice volume in the soil is formed and increased, or it causes thawing and forming of the cavities under the oil pipeline resulting in the appearance of the thermokarsts and sags . During the calculating of the design strength of the oil pipeline, the safety factor is included, considering the probable loads and operational conditions that does not always meet the processes occurred in the soils as pointed by Vladimirov, Kershenbaum (2009). Due to the particularities of the work conditions, the necessity to determine the effect of the freeze-thaw processes, such as the thermokarsts, heaves and sag (subsidence) of the permafrost soils, arises during the oil pipeline operation in order to determine the stress-strain state and changes in the geometric position, as well as to implement the measures for decrease the adverse effect upon the facility performance. 1st International onference on Integrity and Lifeti e in Extreme Environment (ILEE-2019) Influence pr cesses freezi and t a i f er afr st soils on underground pipeline’s stress -strai state leg au ov , ennady oskvitin, ulia rigorieva A.A. Blagonravov Mechanical Engineering Research Institute of RAS (Russian Academy of Sciences),Bardina street 4,Moscow,119334,Russia Abstract The positions of the underground routing pipeline under conditions of the effect of the freeze-thaw processes in the permafrost soils are simulated in the paper. The change in seasonal temperatures leads to the emergence of thermokarsts, heaving and soil failures along the oil pipeline route, which negatively affects the performance of the object. The paper presents the calculation of 520 mm outer diameter (355 JR steel), 30 m length oil pipeline of underground routing (1.5 m depth of burial) in the permafrost soil conditions, which runs 25 ⁰ C temperature oil under 5 Pa pressure, with 0 ⁰ C temperature pipe casing. odeling carried out in SolidWorks software using Simulation package. The stress-strain state and travels occurred during the seasonal changes in the soil are determined. According to the results of the study, the methods of reducing the influence of freezing and thawing processes to prevent the negative impact of mm soils on the oil pipeline are proposed. Keywords: permafrost soil, oil pipeline, stress-strain state; 1. Introduction In the Russian Federation, a great number of the oil and gas fields and oil pipelines (including ESPO-2 (Eastern Siberia - Pacific Ocean) and “Power of Siberia”) are located in the permafrost zone (Yakutia, Komi, etc.). The key feature of this zone is the existence of the seasonal freeze-thaw processes that causes the appearance of the thermokarsts, heaves and sags (see Fig. 1). These events result in the change in the geometric position of the oil pipeline that can cause the emergencies as well as oil and oil product spillages by Naumov et al. (2016, 2019). In order to decrease the probability of the emergency appearance, the small diameter pipes are used with underground routing. This method is an economically feasible one compared with the above-ground routing on the supports; the crucial travels of the oil pipeline do not occur in the case of the above-ground routing. However, there are a number of difficulties during operation. The underground routing pipelines are pressed down with the soil; it affects adversely the facility performance as shown by Borodavkin (1982), Ivantsov and Kharionovskiy (1978). The temperature change leads to the heave appearance, due to which the ice volume in the soil is formed and increased, or it causes thawing and forming of the cavities under the oil pipeline resulting in the appearance of the thermokarsts and sags . During the calculating of the design strength of the oil pipeline, the safety factor is included, considering the probable loads and operational conditions that does not always meet the processes occurred in the soils as pointed by Vladimirov, Kershenbaum (2009). Due to the particularities of the work conditions, the necessity to determine the effect of the freeze-thaw processes, such as the thermokarsts, heaves and sag (subsidence) of the permafrost soils, arises during the oil pipeline operation in order to determine the stress-strain state and changes in the geometric position, as well as to implement the measures for decrease the adverse effect upon the facility performance. 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Influence processes freezing and thawing of permafrost soils on underground pipeline’s stress -strain state Oleg Naumov , Gennady Moskvitin, Yulia Grigorieva A.A. Blagonravov Mechanical Engineering Research Institute of RAS (Russian Academy of Sciences),Bardina street 4,Moscow,119334,Russia Abstract The positions of the underground routing pipeline under conditions of the effect of the freeze-thaw processes in the permafrost soils are simulated in the paper. The change in seasonal temperatures leads to the emergence of thermokarsts, heaving and soil failures along the oil pipeline route, which negatively affects the performance of the object. The paper presents the calculation of 520 mm outer diameter (355 JR steel), 30 m length oil pipeline of underground routing (1.5 m depth of burial) in the permafrost soil conditions, which runs 25 ⁰ C temperatur oil under 5 MPa pressure, with 0 ⁰ C temperature pipe casing. Modeling carried out in SolidWorks software using Simulation package. The stress-strain state and travels occurred during the seasonal changes in the soil are determined. According to the results of the study, the methods of reducing the influence of freezing and thawing processes to prevent the negative impact of mm soils on the oil pipeline are proposed. Keywords: permafrost soil, oil pipeline, stress-strain state; 1. Introduction In the Russian Federation, a great number of the oil and gas fields and oil pipelines (including ESPO-2 (Eastern Siberia - Pacific Ocean) and “Power of Siberia”) are located in the permafrost zone (Yakutia, Komi, etc.). The key feature of this zone is the existence of the seasonal freeze-thaw processes that causes the appearance of the thermokarsts, heaves and sags (see Fig. 1). These events result in the change in the geometric position of the oil pipeline that can cause the emergencies as well as oil and oil product spillages by Naumov et al. (2016, 2019). In order to decrease the probability of the emergency appearance, the small diameter pipes are used with underground routing. This method is an economically feasible one compared with the above-ground routing on the supports; the crucial travels of the oil pipeline do not occur in the case of the above-ground routing. However, there are a number of difficulties during operation. The underground routing pipelines are pressed down with the soil; it affects adversely the facility performance as shown by Borodavkin (1982), Ivantsov and Kharionovskiy (1978). The temperature change leads to the heave appearance, due to which the ice volume in the soil is formed and increased, or it causes thawing and forming of the cavities under the oil pipeline resulting in the appearance of the thermokarsts and sags . During the calculating of the design strength of the oil pipeline, the safety factor is included, considering the probable loads and operational conditions that does not always meet the processes occurred in the soils as pointed by Vladimirov, Kershenbaum (2009). Due to the particularities of the work conditions, the necessity to determine the effect of the freeze-thaw processes, such as the thermokarsts, heaves and sag (subsidence) of the permafrost soils, arises during the oil pipeline operation in order to determine the stress-strain state and changes in the geometric position, as well as to implement the measures for decrease the adverse effect upon the facility performance. 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Influence processes freezing and thawing of permafrost soils on underground pipeline’s stress -strain state Oleg Naumov , Gennady oskvitin, Yulia Grigorieva A.A. Blagonravov Mechanical Engineering Research Institute of RAS (Russian Academy of Sciences),Bardina street 4,Moscow,119334,Russia Abstract The positions of the underground routing pipeline under conditions of the effect of the freeze-thaw processes in the permafrost soils are simulat d in the paper. The change in seasonal temperatures leads to the emergence of thermokarsts, heaving and soil failures along the oil pipeline route, which negatively affects the performance of the object. The paper presents the calculation of 520 mm outer diameter (355 JR steel), 30 m length oil pipeline of underground routing (1.5 m depth of burial) in the permafrost soil conditions, which runs 25 ⁰ C temp ratur oil unde 5 MPa pressure, with 0 ⁰ C temperature pipe casing. Modeling carried out in SolidWorks software using Simulation package. The stress-strain state and travels occurred during the seasonal changes in the soil are determined. According to the results of the study, the methods of reducing the influence of freezing and thawing processes to prevent the negative impact of mm soils on the oil pipeline are proposed. Keywords: permafrost soil, oil pipeline, stress-strain state; 1. Introduction In the Russian Federation, a great number of the oil and gas fields and oil pipelines (including ESPO-2 (Eastern Siberia - Pacific Ocean) and “Power of Siberia”) are located in the permafrost zone (Yakutia, Komi, etc.). The key feature of this zone is the existence of the seasonal freeze-thaw processes that causes the appearance of the thermokarsts, heaves and sags (see Fig. 1). These events result in the change in the geometric position of the oil pipeline that can cause the emergencies as well as oil and oil product spillages by Naumov et al. (2016, 2019). In order to decrease the probability of the emergency appearance, the small diameter pipes are used with underground routing. This m thod is an economically fe ible on compared with the above-ground routing on the supports; the crucial travels of the oil pipeline d ot ccur in the ca e of the above-ground routing. However, there are a number of di ficulties during operation. The u derground routing pipelines are pressed down with the soil; it affects adversely the facility performance as shown by Borodavkin (1982), Ivantsov and Kharionovskiy (1978). The temperature change leads to the heave appearance, due to which the ic volume in the soil is formed and increased, or it causes thawing and forming of the cavities under the oil pipelin resulting in the appearanc of the thermokarsts and sags . During the calculating of the design strength of the oil pipeline, the safety factor is included, considering the probable loads and operational conditions that does not always meet the processes occurred in the soils as pointed by Vladimirov, Kershenbaum (2009). Due to the particularities of the work conditions, the necessity to determine the effect of the freeze-thaw processes, such as the rmokarsts, heaves and sag (subsidence) of the permafrost soils, arises during the oil pipeline operation in order to determine the stress-strain state and changes in the geometric position, as well as to implement the measures for decrease the adverse effect upon the facility performance. 1st International Conference on Integrity and Lifetime in Extreme Environment (ILEE-2019) Influence processes freezing a d thawing of permafrost soils on underground pipeline’s stress -strain state Oleg Naumov , Gennady Moskvitin, Yulia Grigorieva A.A. Blagonravov Mechanical Engineering Research Institute of RAS (Russian Academy of Sciences),Bardina street 4,Moscow,119334,Russia Abstract Th positions of the underground routing ipeline under conditions of the effect of the fr eze-thaw pr cesses in the permafrost soils are simulated in the paper. The change in seasonal te peratures leads to the emergence of thermokarsts, heaving and soil failures along the oil pipelin route, which negatively affec s the performance of the object. The paper presents the calculation of 520 mm outer diameter (355 JR steel), 30 m length oil pipeline of underground routing (1.5 m d pth of burial) in the permafrost soil conditions, which runs 25 ⁰ C temp rature oil under 5 MPa pressure, with 0 ⁰ C temperature pipe casing. Modeling carried out in SolidWorks software using Simulation package. The stress-strain state and travels occurred during the seasonal changes in the soil are determined. According to the results of the study, the methods of reducing the influence of fre zing and thawing processes to prevent the negative impact of mm soils on the oil pipeline are proposed. Keywords: permafrost soil, oil pipeline, stress-strain state; 1. I troduction In the Russian Federation, a great number of the oil and gas fields and oil pipelin s (including ESPO-2 (Eastern Siberia - Pacific Ocean) and “Power of Siberia”) are locat d in the permafrost zone (Yakutia, Komi, etc.). T key feature of this zone is the existe ce of the seasonal freeze-thaw processes that causes the appearance of the thermokarsts, h aves and sags (see Fig. 1). Thes vents result in the c ange in the geometric position of the oil pipeline that can cause th emergencies as w ll as oil and oil product spillages by Naumov et al. (2016, 2019). In ord r to ecrease the probability of the emergency appearance, the small diameter pipes are use with underground routing. This method is a ec nomically fea ibl one compared with the above-ground routing on the supports; the cru ial travels of the oil pipeline do not ccur in the c e of the above-ground routing. However, there are a number of difficulties during operation. The u derground routing pipelines are pressed down with the soil; it affects adversely th facility p rformance as show by Borodavkin (1982), Ivantsov and Kharionovskiy (1978). The temper ture change leads to the heave appearance, due to which the ice volume n the soil is formed and increased, or it causes thawing and forming of the cavities under the oil pip line resul ing in the app aran of the thermokarsts and sags . During the calculating of the design strength of the oil pipeline, the safety factor is included, considering the probable loads and operational conditions that does not always meet the processes occu red in the soils as point d by Vladimirov, Kershenbaum (2009). Du to the par icul rities of the work conditions, the necessity to determine the effect of the freez -thaw processes, such as th thermokarsts, heaves and sag (subsidence) of the permafrost soils, arises during the oil pipelin operation in order to determine the stress-strain state and changes in the geometric position, as well as to implement the measures for decrease the adverse effect upon the facility performance. Keywords: permafrost soil, oil pipeline, stress-strain state;

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 10.1016/j.prostr.2019.12.115 2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers -3216 © 2019 The Author(s). Published by Elsevier B.V. P er-review under responsibility of the IL E-2019 organizers 2452 3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers 2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers * Correspon ing author. Tel.: +7-499-135-35-17. E-mail address: naumov57.on@gmail.com 2452-3216 © 2019 The Author(s). Published by Elsevier B.V. Peer-review under responsibility of the ILEE-2019 organizers * Correspon ing author. Tel.: +7-499-135-35-17. E-mail address: naumov57.on@gmail.com * Corresponding author. Tel.: +7-499-135-35-17. E-mail address: naumov57.on@gmail.com * Corresponding author. Tel.: +7-499-135-35-17. E-mail address: naumov57.on@gmail.com * Corresponding author. Tel.: +7-499-135-35-17. E-mail address: naumov57.on@gmail.com