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Reliability Analysis and Life Prediction of Aging LNG Unloading Arms Based on Non-Destructive Test Data

Author

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  • Duc-Vu Ngo

    (Department of Ocean Science and Engineering, Kunsan National University, Gunsan 54150, Republic of Korea)

  • Jong-Kwon Lim

    (VARM Brain Co., Ltd., Seoul 05634, Republic of Korea)

  • Dong-Hyawn Kim

    (School of Architecture and Coastal Construction Engineering, Kunsan National University, Gunsan 54150, Republic of Korea)

Abstract

Unloading arms (ULAs) among seaport infrastructures are susceptible to deterioration posed by the effects of harsh marine environmental conditions. During infrastructure’s service life, the deterioration of structural integrity may increase the risk of failure of infrastructure, and should be taken into account during structural reliability assessment. In this study, a simple non-destructive test (NDT) was employed to examine the structural deterioration of ULAs which were installed over 30 years ago. Then, these aging ULAs were modeled by the finite-element program, using non-destructive test data to update the thickness dimensions of structural members. Next, a reliability assessment was conducted based on the stress distribution of the main structural components under external loads, which are calculated by their relation to wind speed. Moreover, the time-dependent reliability index curve was also built by considering the deterioration function to predict the failure probability of the particular components during the remaining lifetime. The study revealed that the present condition of the ULA system was satisfactory for current loading conditions. A reliability index predicted with deteriorations factors may be a rational and appropriate approach for the assessment of aging structures needed for efficient infrastructure management.

Suggested Citation

  • Duc-Vu Ngo & Jong-Kwon Lim & Dong-Hyawn Kim, 2022. "Reliability Analysis and Life Prediction of Aging LNG Unloading Arms Based on Non-Destructive Test Data," Energies, MDPI, vol. 15(24), pages 1-19, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9408-:d:1001209
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    References listed on IDEAS

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    1. Cao Wang, 2021. "Time-Dependent Reliability Assessment," Springer Series in Reliability Engineering, in: Structural Reliability and Time-Dependent Reliability, chapter 0, pages 263-359, Springer.
    2. Kim, Dong Hyawn & Lee, Sang Geun, 2015. "Reliability analysis of offshore wind turbine support structures under extreme ocean environmental loads," Renewable Energy, Elsevier, vol. 79(C), pages 161-166.
    3. Liu, Yan & Frangopol, Dan M., 2018. "Time-dependent reliability assessment of ship structures under progressive and shock deteriorations," Reliability Engineering and System Safety, Elsevier, vol. 173(C), pages 116-128.
    4. Wang, Cao & Zhang, Hao & Li, Quanwang, 2017. "Reliability assessment of aging structures subjected to gradual and shock deteriorations," Reliability Engineering and System Safety, Elsevier, vol. 161(C), pages 78-86.
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    Cited by:

    1. Duc-Vu Ngo & Young-Jin Kim & Dong-Hyawn Kim, 2023. "Risk Assessment of Offshore Wind Turbines Suction Bucket Foundation Subject to Multi-Hazard Events," Energies, MDPI, vol. 16(5), pages 1-13, February.

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