Download or read book Reliability based Management of Buried Pipelines Considering External Corrosion Defects written by Seyedeh Azadeh Miran and published by . This book was released on 2016 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion is one of the main deteriorating mechanisms that degrade the energy pipeline integrity, due to transferring corrosive fluid or gas and interacting with corrosive environment. Corrosion defects are usually detected by periodical inspections using in-line inspection (ILI) methods. In order to ensure pipeline safety, this study develops a cost-effective maintenance strategy that consists of three aspects: corrosion growth model development using ILI data, time-dependent performance evaluation, and optimal inspection interval determination. In particular, the proposed study is applied to a cathodic protected buried steel pipeline located in Mexico. First, time-dependent power-law formulation is adopted to probabilistically characterize growth of the maximum depth and length of the external corrosion defects. Dependency between defect depth and length are considered in the model development and generation of the corrosion defects over time is characterized by the homogenous Poisson process. The growth models unknown parameters are evaluated based on the ILI data through the Bayesian updating method with Markov Chain Monte Carlo (MCMC) simulation technique. The proposed corrosion growth models can be used when either matched or non-matched defects are available, and have ability to consider newly generated defects since last inspection. Results of this part of study show that both depth and length growth models can predict damage quantities reasonably well and a strong correlation between defect depth and length is found. Next, time-dependent system failure probabilities are evaluated using developed corrosion growth models considering prevailing uncertainties where three failure modes, namely small leak, large leak and rupture are considered. Performance of the pipeline is evaluated through failure probability per km (or called a sub-system) where each sub-system is considered as a series system of detected and newly generated defects within that sub-system. Sensitivity analysis is also performed to determine to which incorporated parameter(s) in the growth models reliability of the studied pipeline is most sensitive. The reliability analysis results suggest that newly generated defects should be considered in calculating failure probability, especially for prediction of long-term performance of the pipeline and also, impact of the statistical uncertainty in the model parameters is significant that should be considered in the reliability analysis. Finally, with the evaluated time-dependent failure probabilities, a life cycle-cost analysis is conducted to determine optimal inspection interval of studied pipeline. The expected total life-cycle costs consists construction cost and expected costs of inspections, repair, and failure. The repair is conducted when failure probability from any described failure mode exceeds pre-defined probability threshold after each inspection. Moreover, this study also investigates impact of repair threshold values and unit costs of inspection and failure on the expected total life-cycle cost and optimal inspection interval through a parametric study. The analysis suggests that a smaller inspection interval leads to higher inspection costs, but can lower failure cost and also repair cost is less significant compared to inspection and failure costs.

Download or read book Corrosion and Reliability Assessment of Inspected Pipelines written by Rafael Amaya-Gómez and published by Springer Nature. This book was released on 2023-11-20 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the most up-to-date, advanced methods and tools for risk assessment of onshore pipelines. These methods and tools are based primarily on information collected from ILI measurements and additional information about the soil surrounding the pipeline. The book provides a better understanding how the defects grow and interact (repulsion or attraction) and their spatial variability. In addition, the authors contemplate new defects that evolve between inspections and how they could affect the pipeline's reliability. A real-world case is presented to reinforce the concepts presented in the book. The book is structured into three parts: i) an introduction to onshore pipelines and the problem of corrosion, ii) a framework that deals with uncertainty for integrity programs for corroded pipelines, and iii) the applications of the methods presented in the book. The book is ideal for researchers and field engineers in oil and gas transportation and graduate and undergraduate engineering students interested in pipeline reliability assessments, spatial variability, and risk-based inspections.

Download or read book Reliability based Corrosion Management of Energy Pipelines written by Shenwei Zhang and published by LAP Lambert Academic Publishing. This book was released on 2014-05-21 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal-loss corrosion is a major threat to the structural integrity and safe operation of underground oil and gas pipelines worldwide. The reliability-based corrosion management program has been increasingly used in the pipeline industry, which typically includes three tasks, namely periodic high-resolution inline inspections to detect and size corrosion defects on a given pipeline, engineering critical assessment of corrosion defects reported by the inspection tool and mitigation of defects. The work reported in this book addresses the engineering challenges involved in the reliability-based corrosion management program, including the probabilistic corrosion growth modeling based on imperfect inspection data, time-dependent reliability evaluation, and optimal inspection interval determination for corroding pipelines.

Download or read book Development of Probabilistic Corrosion Growth Models with Applications in Integrity Management of Pipelines written by Shenwei Zhang and published by . This book was released on 2014 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metal-loss corrosion is a major threat to the structural integrity and safe operation of underground oil and gas pipelines worldwide. The reliability-based corrosion management program has been increasingly used in the pipeline industry, which typically includes three tasks, namely periodic high-resolution inline inspections (ILIs) to detect and size corrosion defects on a given pipeline, engineering critical assessment of the corrosion defects reported by the inspection tool and mitigation of defects. This study addresses the core involved in the reliability-based corrosion management program. First, the stochastic process in conjunction with the hierarchical Bayesian methodology is used to characterize the growth of defect depth using imperfect ILI data. The biases, random scattering errors as well as the correlations between the random scattering errors associated with the ILI tools are accounted for in the Bayesian inference. The Markov Chain Monte Carlo (MCMC) simulation techniques are employed to carry out the Bayesian updating and numerically evaluate the posterior distributions of the parameters in the growth model. Second, a simulation-based methodology is presented to evaluate the time-dependent system reliability of pressurized energy pipelines containing multiple active metal-loss corrosion defects using the developed growth models. Lastly, a probabilistic investigation is carried out to determine the optimal inspection interval for the newly-built onshore underground natural gas pipelines with respect to external metal-loss corrosion by considering the generation of corrosion defects over time and time-dependent growth of individual defects. The proposed methodology will facilitate the reliability-based corrosion management for corroding pipelines.

Download or read book Modelling of External Corrosion Propagation for Buried Pipelines Based on Stochastic Processes written by Hui Wang and published by . This book was released on 2015 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pipelines are considered to be the most favored and reliable mode for transporting large quantities of gas/liquid. In recent years, because the pipelines are interconnected at a national and global level and because of increasing economic and regulatory constraints in dealing with aging and corroded pipeline systems, pipeline integrity management is an area of increasing relevance in the petroleum industry. Metal deterioration caused by corrosive soil is one of the major threats to the integrity of underground pipeline systems. External localized corrosion is one of the most common defects that can occur under normal operating conditions.In this Dissertation, we consider the external corrosion in pipeline structures in a probabilistic and dynamic manner. Multiple uncertainties from soil environment, pipeline structure, inspection process and maintenance are considered. The correlation between the spatial distribution of the external corrosion defects and the heterogeneous soil properties has been investigated. The correlation analysis is conducted by employing clustering techniques. As for the time domain, the long-time corrosion process is considered as a dynamic stable evolution process which contains three stages: nucleation, propagation and repassivation. In this study, the uncertainties introduced by the in-line inspections are investigated by using calibration methods and detection theories. Both random error and systematic error are assessed. Finally, a comprehensive pipeline maintenance strategy is proposed as an integrated solution to improve the efficiency of inspections and maintenances in industry practice.The contributions of this dissertation include: 1) a probabilistic model for the prediction of metal loss rate in underground pipeline structure is proposed. The model is able to account for the model uncertainty which comes from the imperfect prior knowledge and estimate the PDF of metal loss rate at a specified location. 2) A Bayesian approach for calibrating and estimating the actual external corrosion depth in buried pipeline structures based on an ultrasonic ILI inspection and the clustering technique was developed. We have taken the probability of defect existence into consideration. Hence a more realistic assessment of pipeline integrity can be achieved. 3) A clustering approach based on a hidden Markov random field is established for assessing the spatial distribution of external corrosion in a buried pipeline. The clustering approach presented in this study is easy to implement with the established ICM-EM algorithm. 4) A novel stochastic model framework for predicting the external corrosion growth in buried pipeline structures is presented and a time- and location- dependent maintenance strategy is established. We relate the soil properties with the corrosion growth propagation. The geometric Brownian bridge model was employed to present the corrosion rate evolution and hence is able to represent the inherent time-dependent dynamic property of corrosion growth.

Download or read book Review of the Bureau of Reclamation s Corrosion Prevention Standards for Ductile Iron Pipe written by National Research Council and published by National Academies Press. This book was released on 2009-11-19 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ductile iron pipe (DIP) was introduced about 50 years ago as a more economical and better-performing product for water transmission and distribution. As with iron or steel pipes, DIP is subject to corrosion, the rate of which depends on the environment in which the pipe is placed. Corrosion mitigation protocols are employed to slow the corrosion process to an acceptable rate for the application. When to use corrosion mitigation systems, and which system, depends on the corrosivity of the soils in which the pipeline is buried. The Bureau of Reclamation's specification for DIP in highly corrosive soil has been contested by some as an overly stringent requirement, necessitating the pipe to be modified from its as-manufactured state and thereby adding unnecessary cost to a pipeline system. This book evaluates the specifications in question and presents findings and recommendations. Specifically, the authoring committee answers the following questions: Does polyethylene encasement with cathodic protection work on ductile iron pipe installed in highly corrosive soils? Will polyethylene encasement and cathodic protection reliably provide a minimum service life of 50 years? What possible alternative corrosion mitigation methods for DIP would provide a service life of 50 years?

Download or read book Reliability and Maintainability of In Service Pipelines written by Mojtaba Mahmoodian and published by Gulf Professional Publishing. This book was released on 2018-06-13 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reliability and Maintainability of In-Service Pipelines helps engineers understand the best structural analysis methods and more accurately predict the life of their pipeline assets. Expanded to cover real case studies from oil and gas, sewer and water pipes, this reference also explains inline inspection and how the practice influences reliability analysis, along with various reliability models beyond the well-known Monte Carlo method. Encompassing both numerical and analytical methods in structural reliability analysis, this book gives engineers a stronger point of reference covering both pipeline maintenance and monitoring techniques in a single resource. Provides tactics on cost-effective pipeline integrity management decisions and strategy for a variety of different pipes Presents readers with rational tools for strengthening and rehabing existing pipelines Teaches how to optimize materials selection and design parameters for designing future pipelines with a longer service life

Download or read book Corrosion Control for Offshore Structures written by Ramesh Singh and published by Gulf Professional Publishing. This book was released on 2014-08-12 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: A variable game changer for those companies operating in hostile, corrosive marine environments, Corrosion Control for Offshore Structures provides critical corrosion control tips and techniques that will prolong structural life while saving millions in cost. In this book, Ramesh Singh explains the ABCs of prolonging structural life of platforms and pipelines while reducing cost and decreasing the risk of failure. Corrosion Control for Offshore Structures places major emphasis on the popular use of cathodic protection (CP) combined with high efficiency coating to prevent subsea corrosion. This reference begins with the fundamental science of corrosion and structures and then moves on to cover more advanced topics such as cathodic protection, coating as corrosion prevention using mill applied coatings, field applications, and the advantages and limitations of some common coating systems. In addition, the author provides expert insight on a number of NACE and DNV standards and recommended practices as well as ISO and Standard and Test Methods. Packed with tables, charts and case studies, Corrosion Control for Offshore Structures is a valuable guide to offshore corrosion control both in terms of its theory and application. Prolong the structural life of your offshore platforms and pipelines Understand critical topics such as cathodic protection and coating as corrosion prevention with mill applied coatings Gain expert insight on a number of NACE and DNV standards and recommended practices as well as ISO and Standard Test Methods.

Download or read book Underground Pipeline Corrosion written by Mark Orazem and published by Elsevier. This book was released on 2014-02-17 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Underground pipelines transporting liquid petroleum products and natural gas are critical components of civil infrastructure, making corrosion prevention an essential part of asset-protection strategy. Underground Pipeline Corrosion provides a basic understanding of the problems associated with corrosion detection and mitigation, and of the state of the art in corrosion prevention. The topics covered in part one include: basic principles for corrosion in underground pipelines, AC-induced corrosion of underground pipelines, significance of corrosion in onshore oil and gas pipelines, numerical simulations for cathodic protection of pipelines, and use of corrosion inhibitors in managing corrosion in underground pipelines. The methods described in part two for detecting corrosion in underground pipelines include: magnetic flux leakage, close interval potential surveys (CIS/CIPS), Pearson surveys, in-line inspection, and use of both electrochemical and optical probes. While the emphasis is on pipelines transporting fossil fuels, the concepts apply as well to metallic pipes for delivery of water and other liquids. Underground Pipeline Corrosion is a comprehensive resource for corrosion, materials, chemical, petroleum, and civil engineers constructing or managing both onshore and offshore pipeline assets; professionals in steel and coating companies; and academic researchers and professors with an interest in corrosion and pipeline engineering. Reviews the causes and considers the detection and prevention of corrosion to underground pipes Addresses a lack of current, readily available information on the subject Case studies demonstrate how corrosion is managed in the underground pipeline industry

Download or read book Reliability based Analysis and Maintenance of Buried Pipes Considering the Effect of Uncertain Variables written by Andrew Utomi Ebenuwa and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Risk and Reliability Analysis Theory and Applications written by Paolo Gardoni and published by Springer. This book was released on 2017-02-24 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a unique collection of contributions from some of the foremost scholars in the field of risk and reliability analysis. Combining the most advanced analysis techniques with practical applications, it is one of the most comprehensive and up-to-date books available on risk-based engineering. All the fundamental concepts needed to conduct risk and reliability assessments are covered in detail, providing readers with a sound understanding of the field and making the book a powerful tool for students and researchers alike. This book was prepared in honor of Professor Armen Der Kiureghian, one of the fathers of modern risk and reliability analysis.

Download or read book Reliability Based Integrity Management of Natural Gas Pipelines Subject to Spatio Temporal Corrosive Environment written by Keo-Yuan Wu and published by . This book was released on 2020 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pipeline integrity management refers to an approach of understanding and operating pipelines in a safe and reliable manner. In this work, firstly, a probabilistic predictive model for internal corrosion of natural gas pipelines subject to aqueous CO2/H2S environment has been proposed. The model regards uniform and pitting corrosion as two main corrosion mechanisms and has been calibrated with the experimental data in a deterministic framework. Methodologies of simulating and accounting for temporal and spatial variabilities of operating parameters have been proposed and applied to the model for field applications. The model has been validated against field data from eight wet gas gathering pipelines in a probabilistic framework. Secondly, a reinforcement learning (RL)-based maintenance scheduler has been proposed for pipeline maintenance optimization problems by leveraging the proposed predictive corrosion model and the Q-learning and Sarsa algorithms. A case study has shown the superiority of the proposed maintenance scheduler over the periodic maintenance policy in reducing the maintenance costs. Finally, the previous two parts of work have been integrated into a pipeline system integrity management software featuring pipeline health monitoring, corrosion prognosis, system-level failure analysis, sensor placement optimization, and inspection/maintenance optimization. A case study has been provided to demonstrate the capabilities of the software.

Download or read book Recommended Practice for the Control of External Corrosion on Buried Or Submerged Metallic Structures and Piping Systems written by Canadian Gas Association. Corrosion Control Sub-Committee and published by . This book was released on 1985 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Manual for Determining the Remaining Strength of Corroded Pipelines written by American Society of Mechanical Engineers and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Degradation Assessment and Failure Prevention of Pipeline Systems written by Gabriella Bolzon and published by Springer Nature. This book was released on 2020-09-10 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the results of the research project G5055 'Development of novel methods for the prevention of pipeline failures with security implications,' carried out in the framework of the NATO Science for Peace and Security program, and explores the lifecycle assessment of gas infrastructures. Throughout their service lives, pipelines transporting hydrocarbons are exposed to demanding working conditions and aggressive media. In long-term service, material aging increases the risk of damage and failure, which can be accompanied by significant economic losses and severe environmental consequences. This book presents a selection of complementary contributions written by experts operating in the wider fields of pipeline integrity; taken together, they offer a comprehensive portrait of the latest developments in this technological area.

Download or read book Recommended Practice for the Control of External Corrosion on Buried Or Submerged Metallic Piping Systems written by Canadian Gas Association. Corrosion Control Sub-Committee and published by . This book was released on 1996 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Corrosion and Materials in the Oil and Gas Industries written by Reza Javaherdashti and published by CRC Press. This book was released on 2016-04-19 with total page 715 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advancement of methods and technologies in the oil and gas industries calls for new insight into the corrosion problems these industries face daily. With the application of more precise instruments and laboratory techniques as well as the development of new scientific paradigms, corrosion professionals are also witnessing a new era in the way d