The Deterministic Prediction of Damage Functions to Low Pressure Steam Turbines PDF Download
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Author:
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Category :
Languages : en
Pages : 14
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Book Description
Localized corrosion phenomena, including pitting corrosion, stress corrosion cracking, and corrosion fatigue, are the principal causes of corrosion-induced damage in electric power generating facilities and typically result in more than 50% of the unscheduled outages. Prediction of damage, so that repairs and inspections can be made during scheduled outages, could have an enormous impact on the economics of electric power generation. To date, prediction of corrosion damage has been made on the basis of empirical/statistical methods that have proven to be insufficiently robust and accurate to form the basis for the desired inspection/repair protocol. In this paper, we describe a deterministic method for predicting localized corrosion damage. We have used the method to illustrate how pitting corrosion initiates stress corrosion cracking (SCC) for low pressure steam turbine disks downstream of the Wilson line, where a thin condensed liquid layer exists on the steel disk surfaces. Our calculations show that the SCC initiation and propagation are sensitive to the oxygen content of the steam, the environment in the thin liquid condensed layer, and the stresses that the disk experiences in service.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
Localized corrosion phenomena, including pitting corrosion, stress corrosion cracking, and corrosion fatigue, are the principal causes of corrosion-induced damage in electric power generating facilities and typically result in more than 50% of the unscheduled outages. Prediction of damage, so that repairs and inspections can be made during scheduled outages, could have an enormous impact on the economics of electric power generation. To date, prediction of corrosion damage has been made on the basis of empirical/statistical methods that have proven to be insufficiently robust and accurate to form the basis for the desired inspection/repair protocol. In this paper, we describe a deterministic method for predicting localized corrosion damage. We have used the method to illustrate how pitting corrosion initiates stress corrosion cracking (SCC) for low pressure steam turbine disks downstream of the Wilson line, where a thin condensed liquid layer exists on the steel disk surfaces. Our calculations show that the SCC initiation and propagation are sensitive to the oxygen content of the steam, the environment in the thin liquid condensed layer, and the stresses that the disk experiences in service.
Author:
Publisher: Elsevier
ISBN: 0444527877
Category : Technology & Engineering
Languages : en
Pages : 3652
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Book Description
This four-volume reference work builds upon the success of past editions of Elsevier’s Corrosion title (by Shreir, Jarman, and Burstein), covering the range of innovations and applications that have emerged in the years since its publication. Developed in partnership with experts from the Corrosion and Protection Centre at the University of Manchester, Shreir’s Corrosion meets the research and productivity needs of engineers, consultants, and researchers alike. Incorporates coverage of all aspects of the corrosion phenomenon, from the science behind corrosion of metallic and non-metallic materials in liquids and gases to the management of corrosion in specific industries and applications Features cutting-edge topics such as medical applications, metal matrix composites, and corrosion modeling Covers the benefits and limitations of techniques from scanning probes to electrochemical noise and impedance spectroscopy
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 762
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Book Description
Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Author: DD. Macdonald
Publisher:
ISBN:
Category : Corrosion damage
Languages : en
Pages : 23
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Book Description
The accumulation of damage due to localized corrosion [pitting, stress corrosion cracking (SCC), corrosion fatigue (CF), crevice corrosion (CC), and erosion-corrosion (EC)] in complex industrial systems, such as power plants, refineries, desalination systems, etc., poses a threat to continued safe and economic operation, primarily because of the sudden, catastrophic nature of the resulting failures. Of particular interest in managing these forms of damage is the development of robust algorithms that can be used to predict the integrated damage as a function of time and as a function of the operating conditions of the system. Because complex systems of the same design rapidly become unique, due to differences in operating histories, and because failures are rare events, there is generally insufficient data available on any given system to derive reliable empirical models that capture the impact of all (or even some) of the important independent variables. Accordingly, the models should be, to the greatest extent possible, deterministic with the output being constrained by the natural laws. In this paper, the theory of the initiation of damage, in the form of pitting, is briefly outlined. We then describe the deterministic prediction of the accumulation of damage from SCC and CF in Type 304 SS components in the primary coolant circuits of Boiling Water (Nuclear) Reactors (BWRs) and from pitting and SCC in low-pressure steam turbine disks. These cases have been selected to illustrate the various phases through which localized corrosion damage occurs.
Author: R. D. Kane
Publisher: ASTM International
ISBN: 0803128746
Category : Metals
Languages : en
Pages : 491
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Book Description
The November 2000 symposium addressed methodologies for evaluation of environmental assisted cracking (EAC) in equipment and structures exposed to corrosive environments, and recent developments in the generation of relevant materials properties data based on laboratory tests. Twenty-seven papers fr
Author: D. A. Shifler
Publisher: The Electrochemical Society
ISBN: 9781566774574
Category : Science
Languages : en
Pages : 534
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Book Description
Author: M. J. Moore
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 312
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Book Description
Author: Mansoor Ahmad
Publisher:
ISBN:
Category : Science
Languages : en
Pages :
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Book Description
Erosion of last-stage steam turbine blades is a well-known problem in the turbine manufacturing industry. Damage of structure and loss of efficiency are the common problems associated with erosion. Understanding of the phenomenon leading to low-pressure blade erosion, erosion protection and erosion prediction has been the topic of scientific research and interest in the steam turbine manufacturing community since the start of the nineteenth century. Although several changes in both the steam turbine stage design and steam properties have been adopted to eliminate this problem, none of them have proved to eradicate this phenomenon completely. The only option left for the scientists and designers is to mitigate the process by utilising materials with high erosion resistance. This requires the development of high erosion-resistive materials and then quantitative confirmation of their erosion resistance by using some precise and accurate laboratory methods reflecting the conditions in the last stage of steam turbines. An overview of droplet impact erosion and related theory has been addressed in this chapter. Moreover, different methods to quantify erosion on a laboratory scale will be presented. In addition, different measures to mitigate erosion in low-pressure stages of steam turbines will be described. In the end, different droplet impact erosion prediction approaches will be discussed.
Author: Ali M. Sadegh
Publisher: McGraw Hill Professional
ISBN: 1259588513
Category : Technology & Engineering
Languages : en
Pages : 1536
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Book Description
The 100th Anniversary Edition of the “Bible” for Mechanical Engineers—Fully Revised to Focus on the Core Subjects Critical to the Discipline This 100th Anniversary Edition has been extensively updated to deliver current, authoritative coverage of the topics most critical to today’s Mechanical Engineer. Featuring contributions from more than 160 global experts, Marks’ Standard Handbook for Mechanical Engineers, Twelfth Edition, offers instant access to a wealth of practical information on every essential aspect of mechanical engineering. It provides clear, concise answers to thousands of mechanical engineering questions. You get, accurate data and calculations along with clear explanations of current principles, important codes, standards, and practices. All-new sections cover micro- and nano-engineering, robotic vision, alternative energy production, biological materials, biomechanics, composite materials, engineering ethics, and much more. Coverage includes: • Mechanics of solids and fluids • Heat • Strength of materials • Materials of engineering • Fuels and furnaces • Machine elements • Power generation • Transportation • Fans, pumps, and compressors • Instruments and controls • Refrigeration, cryogenics, and optics • Applied mechanics • Engineering ethics
Author:
Publisher:
ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1200
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Book Description
