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Since 1988

Jee Star Logo Free-span assessment and on-bottom stability

Free-span assessment and on-bottom stability

About the course

Referring to a range of worked examples, this course will give you an appreciation of the integrity issues associated with pipeline instability, spans and dents. A beneficial course for subsea and pipeline engineers involved in integrity management and operations, you will gain knowledge of how to detect and remedy unstable sections of pipeline.

The tutor will explain detailed level 2 and 3 assessments to DNVGL-RP-F105 and F109. These assessments are used for both new and existing pipelines and are integral to the assessment and remediation of pipeline instability. You will learn how to apply these assessments and review a series of case studies presenting real-life scenarios and lessons learned.

Learning outcomes

  • Consider the integrity issues associated with pipeline instability, spans and dents
  • Choose appropriate inspection methods and techniques
  • Validate methods and application
  • Consider when remediation is required and the available options

View course contents
course bar chart Level Advanced
timer icon Duration 3 Days
clock Study Hours 21
Also available in house

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Jee Star Logo Free-span assessment and on-bottom stability - course contents

Day 1

External inspection

  • What to look for
  • Inspection methods
  • Inspection examples

On-bottom stability

  • Fundamentals of pipeline stability
  • Analysis methods
  • Data requirements
  • Force balance approach
  • DNVGL-RP-F109 approach
  • Stabilisation options
  • Case study

Day 2

On-bottom stability exercise

  • Worked examples
  • Exercise

Buoyant span case study

  • Background to the problem
  • Buoyant span assessment
  • Remedial works
  • Lessons learnt

Dent assessment

  • Dent properties and behaviour
  • Causes of dents in subsea pipelines
  • Methods of assessment
  • Worked example
  • Exercise
  • Protection measures
  • Case studies


  • Span detection
  • Assessment of spans
  • Stress and buckle checks
  • Vortex-induced vibrations
  • Remediation

Day 3

Span assessment software

  • DNV FatFree
  • Plus-One
  • SAGE Profile
  • FEA
  • Calculations
  • Comparison

Span assessment exercise

  • Worked example
  • Span assessment exercise
  • Scope for remedial action

  Jee provided me an insight into conservatism and wisdom to accept the assessment by consultants and take a prudent approach  

Vijay Kamate , Total E&P

  Great course delivered by a highly experienced industry professional = improved understanding  

Sameer Ashok Chapgaon , Lloyd's Register

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