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Course Outline

  INTRODUCTION TO HOT SECTION LIFE MANAGEMENT ISSUES Download Course Brochure
 
  • Considerations and constraints
  • Options

    Case Study: Blade alloy development

MATERIALS AND COMPONENTS

  • Hot section superalloys
  • Hot section coatings
  • Trends for the newer designs of machines

DESIGN FOR DURABILITY

  • Basic design considerations for selected hot section parts
  • Design lives for blades and discs

DEGRADATION AND LIFE LIMITATIONS: HOT SECTION

  • Influencing factors
  • Environmental attack
  • Mechanical degradation
  • Microstructural changes and their significance
  • Design related ‘damage’

HOT SECTION CONDITION ASSESSMENT

  • Motivation and general considerations
  • Techniques for assessing component condition
  • Experience and ‘simple’ inspection
  • Qualitative metallographic techniques
  • Quantitative metallographic techniques
  • Assessment frameworks
  • Case studies

REPAIR AND REFURBISHMENT: HOT SECTION

  • Typical repair schemes for blades and vanes
  • Inspection and stripping
  • Welding and brazing
  • Coatings
  • Reheat treatment
  • Technical quality assurance
  • Alternative sourcing and re-manufacture

COMPRESSOR DURABILITY

  • Materials of construction
  • Coatings
  • Effect of operating environment
  • Filtration
  • Mechanical design issues
  • Damage and degradation
  • Inspection
  • Repairs

FAILURE ANALYSIS PROCESS

  • What is a root cause analysis
  • Who is to carry out the investigation
  • Investigation process and framework
  • Tools of the investigation

CASE STUDY: Design related failures

— Coatings life shortfall
— Disc rim cracking
— Compressor blades

CASE STUDY: Operations related

— Thermal fatigue of blades
— Blading corrosion
— Fouling from poor filtration

CASE STUDY: Manufacturing and repair related failures

— Poor coatings
— Inappropriate heat treatments
— Inadequate repair workscope Group exercises

CASE STUDY: Maintenance /inspection related

— Component overheating
— Compressor corrosion and inspection
— Compressor blade failures

APPLICATIONS AND IMPLICATIONS

  • Implications for operators
  • Implications for maintenance
  • Implications for monitoring
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