Preventing Failures in Steam Systems
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Preventing Failures in Steam Systems
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Two-day workshop on analysis and prevention of equipment corrosion, fatigue, creep, and other failures. Aimed at steam cycle and cycle component designers, engineers, operators, maintenance and inspection personnel, water chemists, engineers, metallurgists, and safety and quality assurance personnel; utility and industrial steam generation.
The workshop participants will learn about the industry experience and the basics of design, operation, and material behavior, and about the engineering solutions to the typical problems. They will be able to achieve significant improvements in the failure and damage control through a better understanding of steam cycle operation, by timely inspections, diagnostic monitoring, preventive maintenance, and by knowledge of relevant properties of the materials used. They will better understand how cooperation of operators, water chemists, mechanical and thermodynamic designers, chemical, material, and engineering, and management helps in achieving these improvements.
Background
With the increase of unit sizes, stresses, and heat fluxes, equipment aging, unit cycling, and the high cost of replacement power and steam, the prevention of failures and corrosion of the steam cycle components is of critical importance.
The cost of corrosion, creep and fatigue, erosion, and scale and deposit buildup in the U.S. utility systems is over $3 billion/year. It is even higher for the industrial systems. As much as 50% of the outage time has been attributed to problems with the boiler tubes, condensers, turbines, feedwater heaters, carbon steel piping, PWR steam generators, and BWR pipe welds. Industrial application problems are at least as frequent. The cost of replacement power can be as high as $100/MWh or over one million dollars a day for a large utility unit ($7000/MWh - summer 1998). The cost of reduced or lost production in an industrial plant can be equally high (~$1 million/day).
Main problems include:
 Erosion-corrosion and cavitation of carbon steel piping and other components
 Boiler, heater, and condenser tube failures
 Deaerator weld cracking
 Stress corrosion cracking of LP turbine blade attachments
 Fatigue of blades
 Creep and low cycle fatigue of high temperature components
 Deposition on turbine blades and loss of MW
 Solid particle erosion of turbines and valves
 Failures of bearings
 Cavitation and malfunction of pumps and valves.
Objectives of the Workshop
 To improve knowledge of the equipment damage mechanisms, related design, operation, and maintenance, NDT, corrosion prevention, and monitoring.
 To improve communication and cooperation between engineering, operators, maintenance, chemists, management, and vendors.
 To jointly analyze the current operating and design practices and problems and to make recommendations where improvements can be made.
 An update on the state-of-knowledge and on where to find it.
Agenda
Day 1
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Hours
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1. Introduction: Cost of Outages and Repairs
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1
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2. Equipment Damage Problems (lecture w. examples)
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2
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3. Material Properties including mechanical, fracture, fatigue, creep, and erosion (lecture, metal samples)
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3
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4. Modern Design Practices (lecture with examples, rules, example software)
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1
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Day 2
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Hours
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5. Cycle Chemistry vs. Corrosion
 Feedwater, Boiler Water, and Steam Chemistry
 Chemical Transport, Local Impurity Concentration vs. Corrosion
 Basics and Examples
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2
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6. NDT and Fracture Mechanics (lecture, video)
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1
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7. Life Extension (lecture and examples)
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1
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8. Diagnostic Monitoring (lecture)
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1/2
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9. Troubleshooting, Failure Analysis, Root Cause Analysis (lecture, examples, samples)
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1
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10. Safety Issues, Applications, and Case Histories (joint analysis of case histories)
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1
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11. Conclusions and Recommendations (includes answering questions)
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1/2
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12. Information and Selected References
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 Up-to-date literature is displayed
 Actual pieces of damaged cycle components and test specimens are displayed, circulated, and discussed
 All major safety issues are covered
NOTES: Participants should prepare case histories and questions and bring samples of damaged components for demonstrations and discussion.
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