Reliability analysis of irregular zones in pipelines under both effects of corrosion and residual stress

Nahal, Mourad; Chateauneuf, Alaa; Sahraoui, Yacine

doi:10.1016/j.engfailanal.2019.01.081

Cited by 14 publications

(2 citation statements)

References 38 publications

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“…Because the analysis method was based on various criteria, the key was to take the residual strength as a variable to calculate reliability, which also provided the original guidance for a large number of subsequent reliability analysis studies. Nahal [14] investigated the effects of residual strength on the irregular zones of pipeline corrosion and computed the failure probability and reliability index of various corroded areas. Nahal [15] also used residual strength coupled with the probabilistic model to find the limit-state function and calculated the structure reliability index of pitting corrosion in pipelines.…”

Section: Introductionmentioning

confidence: 99%

Reliability Analysis of Oil and Gas Pipelines Based on Step-Down-Stress Testing in Corrosive Environments

Huang

Zhang

et al. 2022

Mathematical Problems in Engineering

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Reliability analysis provides a basis for the anticorrosion design and maintenance strategy of pipelines. This paper introduces a calculation method for corroded pipeline life reliability by step-down-stress testing (SDST) and Weibull distribution. SDST is used to obtain the corrosion rate of N80 steel under the action of an H2S and CO2 environment at four different temperatures. The Arrhenius model is used to establish the conversion model of failure time and then obtain quasi-samples with parameters. The quasi-samples are used to estimate the parameters of the Weibull distribution, and finally, we can obtain the reliability function of the corroded pipeline. The life reliability curve shows that the pipeline life decreases with the increase of temperature, and when the operation temperature is 363 K, the average life is 10.09 years, which is far less than the designed life. The life reliability of the pipeline decreases with increasing time, when the service life of a pipe with 90% reliability is approximately 7.4 years, and with 50% reliability, it will increase to approximately 10.2 years. With increasing temperature, the average life of the pipeline declines, and at the same temperature, the higher the reliability is, the lower the average life of the pipeline, which provides a reference for the rational use and maintenance decisions of N80 steel pipes. The life reliability of a pipeline for which the operating time is shorter has a smaller temperature effect than that the operating time is longer. This proves that the effect of temperature on life reliability accumulates. This paper strives to provide a scientific basis for the safety management of oil and gas pipelines.

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Section: Introductionmentioning

confidence: 99%

Reliability Analysis of Oil and Gas Pipelines Based on Step-Down-Stress Testing in Corrosive Environments

Huang

Zhang

et al. 2022

Mathematical Problems in Engineering

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show abstract

“…Aryai et al [2] used the three-dimensional nonlinear FEM to model the residual strength of the pipeline in terms of time, and solved the reliability of the water pipe based on the time-dependent reliability analysis. Nahal et al [17] studied the influence of corrosion and residual stress on the irregular area of the pipeline by establishing finite elements model of the corroded elbow area. The failure probability and reliability index of different corrosion areas were calculated by Monte Carlo simulation (MCS).…”

Section: Introductionmentioning

confidence: 99%

Dynamic reliability evaluation of buried corroded pipeline under rockfall impact

Wang¹,

Xie²,

Su³

2022

Eksploatacja i Niezawodność – Maintenance and Reliability

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Load impact, such as the rockfall, may bring significant threats to the integrity management of pipeline. This study is intended to evaluate the reliability of buried pipeline under rockfall impact, and so as to reduce the possible failure and unnecessary downtime. Firstly, the dynamic response of the buried pipeline under load is analyzed by Euler Bernoulli foundation beam. After that, the process of rockfall impact on buried corroded pipeline is simulated with nonlinear finite element method. Furthermore, the influence of rockfall’s parameters (including rockfall mass, impact velocity, impact position, etc.) on the pipeline’s equivalent stress is quantitatively analyzed. Eventually, a time-varying reliability model is established to calculate the failure probability. The results indicate that the mass and velocity of the rockfall have obvious influence on the pipeline’s failure probability, and the change of impact’s position has small influence. The proposed method can provide a theoretical reference for the design and maintenance of buried pipeline.

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Insight into the Compatibility of RZ-3A21 Aluminum Alloy with Ethylene Glycol under High-Temperature Acceleration

Shi,

Wang,

Zhao

et al. 2024

J. of Materi Eng and Perform

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Reliability analysis of irregular zones in pipelines under both effects of corrosion and residual stress

Cited by 14 publications

References 38 publications

Reliability Analysis of Oil and Gas Pipelines Based on Step-Down-Stress Testing in Corrosive Environments

Reliability Analysis of Oil and Gas Pipelines Based on Step-Down-Stress Testing in Corrosive Environments

Dynamic reliability evaluation of buried corroded pipeline under rockfall impact

Insight into the Compatibility of RZ-3A21 Aluminum Alloy with Ethylene Glycol under High-Temperature Acceleration

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