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Since 1988

Jee Star Logo Corrosion defect assessment

About the course

This course enables learners to assess the acceptability of corrosion defects identified on their pipeline assets. Throughout the course, a range of defect assessment approaches will be explored, along with their capabilities and limitations. This course will enable learners to make informed decisions when performing defect assessments, or reviewing the work of others.

**Please note that the Virtual Classroom is split over three days: 12th May, 14th May and 19th May**


Learning outcomes

By the end of this course, you will be able to:

  • Describe criteria for fitness-for-service
  • Evaluate various defect assessment approaches, including:
    • ASME B31G method
    • DNVGL-RP-F101 approaches
    • Finite element analysis
    • Engineering criticality assessment
  • Apply appropriate defect assessment approach to determine pipeline fitness-for-service

View course contents
timer icon Duration 3 Days
clock Study Hours 21

About the Tutor

Graham Wilson
MEng (Hons) CEng MIMechE

Graham is Jee’s Head of Integrity Management and a chartered mechanical engineer with over 15 years’ industry experience. He has particular expertise in integrity management, design, fishing interaction studies and verification.

Graham teaches Integrity management courses, Corrosion defect assessment and Decommissioning programme development and execution. 

Jee Star Logo Corrosion defect assessment - course contents

Day 1

Corrosion threats

  • Types of corrosion
  • Defect categorisation
  • Corrosion control measures and effectiveness
  • Corrosion monitoring and inspection techniques
  • Case studies


Fitness-for-service assessment

  • Classification of corrosion defects
  • Corrosion rate modelling
  • Corrosion defect interaction
  • Defect assessment approaches
  • Assessment limitations and applicability
  • Determination of fitness-for-service
  • Ongoing management


Day 2

ASME B31G approach

  • Differences between original and modified approach
  • Levels of assessment
  • Defect acceptance criteria and measurement uncertainty
  • Defect assessment worked example
  • Long defects and deep pits


  • Differences between Part A and Part B approach
  • Levels of assessment
  • Defect acceptance criteria and measurement uncertainty
  • Defect assessment worked example
  • Longitudinal and circumferential defects and validity limits
  • Supplementary use of Kastner approach


Day 3

Use of Finite Element Analysis (FEA)

  • When to move to an FEA based approach
  • Inspection data requirements
  • Application of API579
  • Corrosion defect modelling and determination of acceptability
  • Case study



  • Defects requiring ECA
  • Applicable codes and standards
  • DNVGL-RP-F108 and BS7910 approaches
  • Worked example



  • Determine the acceptability of a corrosion defect identified by recent ILI run in a multi-phase pipeline system.
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