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

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...

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Bibliographic Details
Published in:Energies (Basel) 2022-12, Vol.15 (24), p.9408
Main Authors: Ngo, Duc-Vu, Lim, Jong-Kwon, Kim, Dong-Hyawn
Format: Article
Language:English
Subjects:
Aging
aging unloading arm
Analysis
Corrosion
Deterioration
Environmental conditions
Harbors
Life prediction
Load
Loading and unloading
Marine environment
Mathematical models
Non-destructive testing
Nondestructive testing
Random variables
Reliability (Engineering)
Reliability analysis
reliability assessment
Safety and security measures
Service life
Stochastic models
Stress distribution
Structural members
Structural reliability
Structural stability
Thickness
time-dependent reliability index
Wind speed
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en15249408