TY  - JOUR
AU  - Zelmati, Djamel
AU  - Bouledroua, Omar
AU  - Hafsi, Zahreddine
AU  - Đukić, Miloš
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3411
AB  - A methodology is developed in this paper to estimate the time-dependent reliability of a pipeline in Algeria, which is in exploitation from 1981 and with internal and external localized corrosion defects detected in 2009. A probabilistic approach was applied to a pipeline made of API 5L X60 steel for the long-distance transportation of natural gas (55 km), which crossing several geo-graphical reliefs in different country areas. The analysis was carried out by taking into con-sideration the potential stochastic variables altering drastically the reliability of the pipeline, i.e., dimensions of the localized corrosion defects, their locations, and distribution, and the corrosion rate. The correlations between the pipeline spatial corrosion defects distribution and their di-mensions, obtained by using an intelligent inspection tool are used to analyze the actual in-service corrosion attack rate and for enhancement of the accuracy of the reliability assessment. The failure scenario was considered as the moment when the pipeline operating pressure exceeds the failure pressure defined analytically in accordance with different commonly used standards. The assessment of the reliability index of the corroded pipeline subjected to internal pressure and the failure probability was done. The detailed reliability analysis is carried out by using the second order reliability method (SORM) for the basic random variables with different prob-abilistic density within a nonlinear limit state function. The latter is based on the limit analysis of the failure pressure model for different standards and the numerical analysis using the finite element method and ANSYS software.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Engineering Failure Analysis
T1  - Probabilistic analysis of corroded pipeline under localized corrosion defects based on the intelligent inspection tool
VL  - 115
DO  - 10.1016/j.engfailanal.2020.104683
ER  - 

@article{
author = "Zelmati, Djamel and Bouledroua, Omar and Hafsi, Zahreddine and Đukić, Miloš",
year = "2020",
abstract = "A methodology is developed in this paper to estimate the time-dependent reliability of a pipeline in Algeria, which is in exploitation from 1981 and with internal and external localized corrosion defects detected in 2009. A probabilistic approach was applied to a pipeline made of API 5L X60 steel for the long-distance transportation of natural gas (55 km), which crossing several geo-graphical reliefs in different country areas. The analysis was carried out by taking into con-sideration the potential stochastic variables altering drastically the reliability of the pipeline, i.e., dimensions of the localized corrosion defects, their locations, and distribution, and the corrosion rate. The correlations between the pipeline spatial corrosion defects distribution and their di-mensions, obtained by using an intelligent inspection tool are used to analyze the actual in-service corrosion attack rate and for enhancement of the accuracy of the reliability assessment. The failure scenario was considered as the moment when the pipeline operating pressure exceeds the failure pressure defined analytically in accordance with different commonly used standards. The assessment of the reliability index of the corroded pipeline subjected to internal pressure and the failure probability was done. The detailed reliability analysis is carried out by using the second order reliability method (SORM) for the basic random variables with different prob-abilistic density within a nonlinear limit state function. The latter is based on the limit analysis of the failure pressure model for different standards and the numerical analysis using the finite element method and ANSYS software.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Engineering Failure Analysis",
title = "Probabilistic analysis of corroded pipeline under localized corrosion defects based on the intelligent inspection tool",
volume = "115",
doi = "10.1016/j.engfailanal.2020.104683"
}

Zelmati, D., Bouledroua, O., Hafsi, Z.,& Đukić, M.. (2020). Probabilistic analysis of corroded pipeline under localized corrosion defects based on the intelligent inspection tool. in Engineering Failure Analysis
Pergamon-Elsevier Science Ltd, Oxford., 115.
https://doi.org/10.1016/j.engfailanal.2020.104683

Zelmati D, Bouledroua O, Hafsi Z, Đukić M. Probabilistic analysis of corroded pipeline under localized corrosion defects based on the intelligent inspection tool. in Engineering Failure Analysis. 2020;115.
doi:10.1016/j.engfailanal.2020.104683 .

Zelmati, Djamel, Bouledroua, Omar, Hafsi, Zahreddine, Đukić, Miloš, "Probabilistic analysis of corroded pipeline under localized corrosion defects based on the intelligent inspection tool" in Engineering Failure Analysis, 115 (2020),
https://doi.org/10.1016/j.engfailanal.2020.104683 . .

TY  - JOUR
AU  - Bouledroua, Omar
AU  - Hafsi, Zahreddine
AU  - Đukić, Miloš
AU  - Elaoud, Sami
PY  - 2020
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3383
AB  - We are reporting in this study the hydrogen permeation in the lattice structure of a steel pipeline designed for natural gas transportation by investigating the influence of blending gaseous hydrogen into natural gas flow and resulted internal pressure values on the structural integrity of cracked pipes. The presence of cracks may provoke pipeline failure and hydrogen leakage. The auto-ignition of hydrogen leaks, although been small, leads to a flame difficult to be seen. The latter makes such a phenomenon extremely dangerous as explosions became very likely to happen. In this paper, a reliable method is presented that can be used to predict the acceptable defect in order to reduce risks caused by pipe failure due to hydrogen embrittlement. The presented model takes into account the synergistic effects of transient gas flow conditions in pipelines and hydrogen embrittlement of steel material due to pressurized hydrogen gas permeation. It is found that blending hydrogen gas into natural gas pipelines increases the internal load on the pipeline walls due to overpressure values that may be reached in a transient gas flow regime. Also, the interaction between transient hydrogen gas flow and embrittlement of API 5L X52 steel pipeline was investigated using Failure Assessment Diagram (FAD) and the results have shown that transient flow enhances pipeline failure due to hydrogen permeation. It was shown that hydrogen embrittlement of steel pipelines in contact with the hydrogen environment, together with the transient gas flow and significantly increased transient pressure values, also increases the probability of failure of a cracked pipeline. Such a situation threatens the integrity of high stress pipelines, especially under the real working conditions of hydrogen gas transportation.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - International Journal of Hydrogen Energy
T1  - The synergistic effects of hydrogen embrittlement and transient gas flow conditions on integrity assessment of a precracked steel pipeline
EP  - 18020
IS  - 35
SP  - 18010
VL  - 45
DO  - 10.1016/j.ijhydene.2020.04.262
ER  - 

@article{
author = "Bouledroua, Omar and Hafsi, Zahreddine and Đukić, Miloš and Elaoud, Sami",
year = "2020",
abstract = "We are reporting in this study the hydrogen permeation in the lattice structure of a steel pipeline designed for natural gas transportation by investigating the influence of blending gaseous hydrogen into natural gas flow and resulted internal pressure values on the structural integrity of cracked pipes. The presence of cracks may provoke pipeline failure and hydrogen leakage. The auto-ignition of hydrogen leaks, although been small, leads to a flame difficult to be seen. The latter makes such a phenomenon extremely dangerous as explosions became very likely to happen. In this paper, a reliable method is presented that can be used to predict the acceptable defect in order to reduce risks caused by pipe failure due to hydrogen embrittlement. The presented model takes into account the synergistic effects of transient gas flow conditions in pipelines and hydrogen embrittlement of steel material due to pressurized hydrogen gas permeation. It is found that blending hydrogen gas into natural gas pipelines increases the internal load on the pipeline walls due to overpressure values that may be reached in a transient gas flow regime. Also, the interaction between transient hydrogen gas flow and embrittlement of API 5L X52 steel pipeline was investigated using Failure Assessment Diagram (FAD) and the results have shown that transient flow enhances pipeline failure due to hydrogen permeation. It was shown that hydrogen embrittlement of steel pipelines in contact with the hydrogen environment, together with the transient gas flow and significantly increased transient pressure values, also increases the probability of failure of a cracked pipeline. Such a situation threatens the integrity of high stress pipelines, especially under the real working conditions of hydrogen gas transportation.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "International Journal of Hydrogen Energy",
title = "The synergistic effects of hydrogen embrittlement and transient gas flow conditions on integrity assessment of a precracked steel pipeline",
pages = "18020-18010",
number = "35",
volume = "45",
doi = "10.1016/j.ijhydene.2020.04.262"
}

Bouledroua, O., Hafsi, Z., Đukić, M.,& Elaoud, S.. (2020). The synergistic effects of hydrogen embrittlement and transient gas flow conditions on integrity assessment of a precracked steel pipeline. in International Journal of Hydrogen Energy
Pergamon-Elsevier Science Ltd, Oxford., 45(35), 18010-18020.
https://doi.org/10.1016/j.ijhydene.2020.04.262

Bouledroua O, Hafsi Z, Đukić M, Elaoud S. The synergistic effects of hydrogen embrittlement and transient gas flow conditions on integrity assessment of a precracked steel pipeline. in International Journal of Hydrogen Energy. 2020;45(35):18010-18020.
doi:10.1016/j.ijhydene.2020.04.262 .

Bouledroua, Omar, Hafsi, Zahreddine, Đukić, Miloš, Elaoud, Sami, "The synergistic effects of hydrogen embrittlement and transient gas flow conditions on integrity assessment of a precracked steel pipeline" in International Journal of Hydrogen Energy, 45, no. 35 (2020):18010-18020,
https://doi.org/10.1016/j.ijhydene.2020.04.262 . .