The Experts below are selected from a list of 1305 Experts worldwide ranked by ideXlab platform
Jian Shuai - One of the best experts on this subject based on the ideXlab platform.
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Probabilistic analysis of Corroded Pipelines based on a new failure pressure model
Engineering Failure Analysis, 2017Co-Authors: Yi Shuai, Jian ShuaiAbstract:Abstract The paper provides a new model to predict the burst pressure for Corroded Pipeline by finite element method. Error analysis with commonly used models shows that the new model has better prediction precision. Based on this model, the limit state equation is established and numerically solved by using Monte Carlo Simulation (MCS). It shows that the new model is feasible for reliability analysis of Corroded Pipelines when compared with other widely used models. The sensitivity analysis of parameters and model revealed that the corrosion depth and the Pipeline operation pressure have the most influence on the Pipeline failure probability.
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A Study on New Edition Assessment Criteria for the Remaining Strength of Corroded Pipeline
ICPTT 2011, 2011Co-Authors: Jian ShuaiAbstract:ASME B31G is the most basic and widespread method which enables to assess the remaining strength of Corroded Pipelines. ASME B31G-2009 is the third edition of B31G which is the newest revision approved by the American National Standards Institute (ANSI). This paper comprehensively introduced the development process of ASME B31G, and do some comparative studies with other standards of RSTRENG 0.85 dL and DNV RP - F101 which are also widely used in assessment the remaining strength of Corroded Pipelines. The predicted failure pressure are calculated for each standard mentioned above, based on 35 groups datum of pipe full-size blasting test collected from several literatures, and express the deviation between the forecasted value and the real datum quantificational by charts. Finally, safety criterion, applicable defects types, the strength grade of pipe and so on are analyzed and compared among the assessment methods. The investments showed that ASME B31G-2009 is much more greatly improved than previous editions of B31G; the conservative properties of ASME B31G-2009 and RSTRENG 0.85 dL are both much lower. They have effectively improved the pipe conveying efficiency and optimized the cost efficiency. However, they are both only applicable to evaluate the medium and low strength steel pipes. Inversely, NV RP-F101 is applicable to the medium and high strength steel pipes. Its results are often not safe to the lower strength steel pipes.
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Evaluating the Failure Pressure of Corroded Pipeline
ASME 2010 Pressure Vessels and Piping Conference: Volume 6 Parts A and B, 2010Co-Authors: Jian ShuaiAbstract:This paper presented a review on ASME B31G, DNV RP-F101 and PCORRC methods in evaluating the remaining strength of Corroded Pipeline. These methods are validated by 67 sets of data about full-scale burst test of pipe with a defect. A numerical model for predicting the burst failure of Corroded Pipeline was constructed using the non-linear finite element method. Using this model, the full-size pipe burst experiments of Pipelines in different material, size and defect was analyzed and computed. The proposed FEM model was validated. Based on the calculation result using the model, a new formula predicting failure pressure was presented, in which depth, length and width of a defect was involved. Comparison of the formula with the other assessment method and experiments showed the formula had a satisfactory precision.Copyright © 2010 by ASME
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Prediction of Failure Pressure of Corroded Pipelines Based on Finite Element Analysis
2008 7th International Pipeline Conference Volume 2, 2008Co-Authors: Jian Shuai, Chun’e Zhang, Fulai ChenAbstract:A numerical model for predicting the burst failure of Corroded Pipeline is constructed using the non-linear finite element method, in which the technical points including element mesh, materials model, non-linear solution and failure criterion are recommended. Using this model, the full-size pipe burst experiments in different material, size and defect was analyzed and computed. The proposed FEM model was validated. Based on the calculation result using the model, a new formula predicting failure pressure is proposed, in which depth, length and width of a defect was involved. Comparison of the formula with the other assessment method and experiments show the formula had a satisfactory precision.Copyright © 2008 by ASME
Guojin Qin - One of the best experts on this subject based on the ideXlab platform.
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failure probability assessment and prediction of Corroded Pipeline under earthquake by introducing in line inspection data
Engineering Failure Analysis, 2020Co-Authors: Yihuan Wang, Peng Zhang, Xiang Qin Hou, Guojin QinAbstract:Abstract Considering the transient ground deformation (TGD) and permanent ground deformation (PGD), uncertain modeling is proposed by multiple limit states with time-dependent corrosion growth and seismic damage, as well as the rehabilitation. In this work, the developed corrosion growth model implemented the correlated 3D stochastic growth for one-defect. It then embedded in the combination model involved in Corroded defect and seismic loading. Further, the Bayesian method and Markov Chain Monte Carlo (MCMC) simulation were used to obtain the updating of failure probability by introducing rehabilitation and in-line inspection (ILI) data. Failure probability was performed to study this difference using Monte Carlo simulation (MCS) to compare with the effect of the different parameters. A numerical example was investigated proposed models, and the influence of assessment rehabilitation was also discussed. The results indicate the potential impact of seismic damage for the Corroded Pipeline is significant, which can optimize the frame reliability-based anti-seismic for pipe infrastructure.
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Non-Probabilistic Time-Varying Reliability-Based Analysis of Corroded Pipelines Considering the Interaction of Multiple Uncertainty Variables
Energies, 2019Co-Authors: Xiang Qin Hou, Peng Zhang, Yihuan Wang, Guojin QinAbstract:Reliability analysis of Corroded Pipelines is critical to the integrity and safe working of Pipeline infrastructure. Aiming at less probability information is obtained for corrosion Pipeline engineering, and the mechanical properties of Pipeline with corrosion defects deteriorate caused by the accumulative effect of corrosion growth. Based on the quasi-static analysis method and non-probability theory, this paper presents a reliability model for assessing Corroded Pipelines with corrosion growth. In fact, reliability analysis of Corroded Pipelines needs to consider the interaction of multiple uncertainty variables. By introducing interaction theory, a mathematical model of corrosion defects considering the interaction of variables is put forward. Moreover, this paper develops a non-probabilistic time-varying reliability method for Pipeline systems with multiple defects. Thus, several numerical examples are investigated to discuss the effectiveness of the proposed methodology. The results show that a two-dimensional or even three-dimensional ellipsoid model with correlation has more accurate results to evaluate Corroded Pipelines under the interaction of multiple Corroded defects with poor information. Furthermore, a non-probabilistic time-varying reliability model is established according to the time-varying characteristics of the Corroded Pipeline under the influence of multiple factors. An effective complement to the theory of non-probabilistic reliability analysis of system is investigated. The analysis of the results suggests that interaction of Corroded Pipeline has a negligible impact on reliability. It also provides a theoretical basis for maintenance and is of great significance for risk- and reliability-informed decisions regarding buried oil and gas Pipelines.
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Failure probability of Corroded Pipeline considering the correlation of random variables
Engineering Failure Analysis, 2019Co-Authors: Peng Zhang, Guojin Qin, Xinhai Kong, Yang PengAbstract:Abstract In view of the shortcomings of independence assumption for random variables in the reliability analysis of Corroded Pipeline, an analytical method is put forward for the reliability of Corroded Pipeline considering the correlation among random variables. The models of corrosion perforation, local burst and rupture as well as their composite failure probability are also established. Based on JC method and orthogonal transformation, the multidimensional normal distribution function is used to propose a computational method for the multi-mode failure probability of Corroded Pipeline considering correlated random variables. This paper elaborates on the correlation of Pipeline reliability analysis. Meanwhile, based on case studies, a study is conducted on how the Pipeline failure probability is affected by the correlation between four pairs of random variables, including pipe diameter and wall thickness, the depth and length of the defect, the radial rate and axial rate of corrosion, as well as yield strength and tensile strength. The analysis results suggest that the correlation between random variables has no influence on the failure probability of Pipeline corrosion perforation. The probability of local burst, rupture and composite failure increases with the increase of correlation coefficient between the defect depth and length as well as that between the radial and axial corrosion rate, and decreases with the increase of correlation coefficient between the pipe diameter and wall thickness. The larger the correlation coefficient between yield strength and tensile strength is, the greater the probability of local burst and rupture will be, while the composite failure probability remains the same. Besides, the impact of variables correlation on the failure probability of Corroded Pipeline decreases as the corrosion continues. The failure probability of Corroded Pipeline is most sensitive to the correlation coefficient between the radial and axial corrosion rate, and least sensitive to the correlation coefficient between the yield strength and tensile strength.
Saravanan Karuppanan - One of the best experts on this subject based on the ideXlab platform.
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failure pressure prediction of a Corroded Pipeline with longitudinally interacting corrosion defects subjected to combined loadings using fem and ann
Journal of Marine Science and Engineering, 2021Co-Authors: Saravanan Karuppanan, Mark OvinisAbstract:Machine learning tools are increasingly adopted in various industries because of their excellent predictive capability, with high precision and high accuracy. In this work, analytical equations to predict the failure pressure of a Corroded Pipeline with longitudinally interacting corrosion defects subjected to combined loads of internal pressure and longitudinal compressive stress were derived, based on an artificial neural network (ANN) model trained with data obtained from the finite element method (FEM). The FEM was validated against full-scale burst tests and subsequently used to simulate the failure of a Pipeline with various corrosion geometric parameters and loadings. The results from the finite element analysis (FEA) were also compared with the Det Norske Veritas (DNV-RP-F101) method. The ANN model was developed based on the training data from FEA and its performance was evaluated after the model was trained. Analytical equations to predict the failure pressure were derived based on the weights and biases of the trained neural network. The equations have a good correlation value, with an R2 of 0.9921, with the percentage error ranging from −9.39% to 4.63%, when compared with FEA results.
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finite element analyses of Corroded Pipeline with single defect subjected to internal pressure and axial compressive stress
Marine Structures, 2020Co-Authors: Thibankumar Arumugam, Saravanan Karuppanan, Mark OvinisAbstract:Abstract This paper describes the application of finite element method (FEM) and the development of equations to predict the failure pressure of single corrosion affected pipes subjected to internal pressure and axial compressive stress. The finite element analysis (FEA) results were verified against full-scale burst tests and theoretical calculations. Material non-linearity, which allow for large strains and displacements, were considered. In addition, true UTS instead of engineering UTS was used to determine the point of failure. The pipes used in the FEA was modelled based on API 5L X52 modified steel with a length of 2000 mm, a nominal outer diameter of 300 mm, and a nominal wall thickness of 10 mm. The results obtained from FEA were compared to that of existing comprehensive corrosion assessment method, known as DNV-RP-F101. Six equations, utilizing the Buckingham's π theorem and multivariate non-linear regression techniques, were developed for predicting the failure pressure of Corroded Pipeline with single defect subjected to both internal pressure and axial compressive stress. These equations provide improved failure pressure predictions with good margins of errors (less than 10%).
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strength assessment of a Corroded Pipeline through the burst test case study
Journal of Pipeline Systems Engineering and Practice, 2016Co-Authors: Chanyalew Taye Belachew, Che Ismail Mokhtar, Saravanan KaruppananAbstract:AbstractFailure due to corrosion has become one of the major problems in maintaining Pipeline integrity. Smart pigs have been used for decades to assess the in situ condition of steel pipe serving the oil and gas industries. The assessment techniques used are generally described in standards prepared by American Petroleum Institute (API) and American Society for Testing and Materials (ASTM). These standards are viewed by some in the industry as being conservative, resulting in premature repair or replacement of Pipelines. Therefore, Pipeline operators need better, more reliable condition assessment tools, not only to assure safe operations, but also to optimize maintenance costs. That is to repair or replace only the pipe sections that need the remediation. Recently, an alternative condition assessment method was developed using finite element (FE) analyses that were validated through actual pipe burst tests results. In this paper, the burst test procedure and results of testing a 250-mm (10-in.) nominal ...
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failure pressure estimation of Corroded Pipeline with different depths of interacting defects subjected to internal pressure
Applied Mechanics and Materials, 2013Co-Authors: Ariz Ahmad Azmy, Saravanan Karuppanan, Azmi Abdul WahabAbstract:Pipelines are one of the most reliable and safest ways to transport oil and gas from one location to another. However, if not handled and maintained properly, they will cause major destruction should one of these Pipelines burst. A Pipeline which has oil or gas flowing through it will be subjected to internal pressure due to the flow of the oil or gas. Furthermore, the chemical composition of the oil and gas acts as a corrosive agent towards the Pipeline. The corrosion eventually becomes defects thus compromising the Pipeline integrity. In addition, if two defects are close enough, they are treated as interacting defects. In this work, the Pipeline integrity was first calculated using DNV RP-101 codes. After calculating the maximum operating pressure for the Pipeline using the codes, Finite Element Analyses using ANSYS were carried out to simulate and model the Pipeline with the interacting defects. The maximum operating pressure given by the FEA was then compared to the DNV codes. We found that despite consistency between DNV codes, the FEA analysis showed that geometry plays an important part in determining the values of failure pressure. The FEA analysis showed that by increasing the ratio of depth between the interacting defects, the failure pressure decreases. This was likely because defects of larger depths are more likely to fail at lower pressures. This contradicts the results obtained from DNV codes where the failure pressure is constant for the same effective defect depth over thickness, (d12/t)*.
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EVALUATION OF AVAILABLE CODES FOR CAPACITYASSESSMENT OF Corroded PipelineS
2009Co-Authors: Chanyalew Taye Belachew, Mokhtar Che Ismail, Saravanan KaruppananAbstract:Evaluation of the capacity of Corroded Pipeline is an issue for several researchers and Pipeline operators. Though there are various methods used for the assessment of remaining strength of Corroded pipes, some of these methods are too much simplified and rely only upon the defect length and depth, ignoring the defect width and orientation. Moreover, most of these well known methods are limited to internal pressure and non interacting defects. In this paper evaluation of the most widely applicable corrosion assessment methods of ASME B31G, Modified B31G, RSTRENG, DNV RP-F-101 and PCORRC is conducted. As expected, the evaluation result shows that these methods are too much conservative. This means when Pipeline operators use these codes for their fitness for service assessment; they are subjected to either unnecessary maintenance or premature replacement of Pipelines. Therefore, further research towards the development of less conservative capacity assessment method based on burst test and nonlinear finite element method (FEM) is recommended.
Xuejianghong - One of the best experts on this subject based on the ideXlab platform.
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A non-linear finite-element analysis of buckle propagation in subsea Corroded Pipelines
Finite Elements in Analysis and Design, 2006Co-Authors: XuejianghongAbstract:A non-linear finite-element analysis for the steady-state buckle propagation phenomenon in subsea Corroded Pipelines subjected to external hydrostatic pressure is presented. The Corroded Pipeline i...
Jianghong Xue - One of the best experts on this subject based on the ideXlab platform.
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A non-linear finite-element analysis of buckle propagation in subsea Corroded Pipelines
Finite Elements in Analysis and Design, 2006Co-Authors: Jianghong XueAbstract:A non-linear finite-element analysis for the steady-state buckle propagation phenomenon in subsea Corroded Pipelines subjected to external hydrostatic pressure is presented. The Corroded Pipeline is modeled as an infinitely long, cylindrical shell with a non-uniform thickness region. Using Maxwell's theory of two coexisting phases and principle of virtual work, the buckle propagation pressures for the Corroded Pipeline are calculated from pressure-volume change relations obtained from ABAQUS. The corresponding collapse modes of the Corroded Pipeline are generated from ABAQUS post-analysis. Symmetric and anti-symmetric collapse modes are found to occur, depending on the depth and angular extent of the corrosion. In addition, snap-through and global collapses are also identified. A parametric study shows how the buckle propagation pressures decrease when either the ratio of corrosion depth to the normal thickness or the angular extent of the corrosion increases. The finite-element model is validated using Timoshenko's classical solutions.
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Symmetric and anti-symmetric buckle propagation modes in subsea Corroded Pipelines
Marine Structures, 2005Co-Authors: Jianghong Xue, Michelle S. Hoo FattAbstract:Solutions for the steady-state buckle propagation modes and pressures in a Corroded Pipeline subjected to external hydrostatic pressure are presented. The buckle propagation pressure of a Corroded Pipeline is obtained analytically with a rigid-plastic analysis and numerically from finite element analysis (ABAQUS). Both the rigid-plastic analysis and ABAQUS program reveal symmetric and anti-symmetric buckling modes, depending on the depth and angular extent of the corrosion. Snap-through and global buckling of the Pipeline are also distinguished in both solutions. The rigid-plastic solutions for buckle propagation pressure and corresponding collapse modes are found to be within 15% with numerical solutions.
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Propagating buckles in Corroded Pipelines
Marine Structures, 2001Co-Authors: Michelle S. Hoo Fatt, Jianghong XueAbstract:Abstract Rigid–plastic solutions for the steady-state, quasi-static buckle propagation pressure in Corroded Pipelines are derived and compared to finite element predictions (ABAQUS). The Corroded Pipeline is modeled as an infinitely long, cylindrical shell with a section of reduced thickness that is used to describe the corrosion. A five plastic hinge mechanism is used to describe plastic collapse of the Corroded Pipeline. Closed-form expressions are given for the buckle propagation pressure as a function of the amount of corrosion in an X77 steel Pipeline. Buckles that propagate down the Pipeline are caused by either global or snap-through buckling, depending on the amount of corrosion. Global buckling occurs when the angular extent of the corrosion is greater than 90°. When the angular extent is less than 90° and the corrosion is severe, snap-through buckling takes place. The buckle propagation pressure and the corresponding collapse modes also compare well to finite element predictions.
