• Engineering: +44 (0)1224 392 040    Training: +44 (0)1732 371 391
  • Library Login
  • british flag United Kingdom

Subsea Engineering and training experts

Since 1988

Jee Star Logo Reeling calculations

About the course

Detailing the engineering behind reel-lay installation, this is an advanced course that demystifies this complex field. Ideal for reeling companies and anyone involved in the design and installation of pipelines, this course explains the fundamentals of reel-lay.

The tutor will explain key design aspects such as the implications of cumulative plastic strain, ovalisation and weld defects using worked examples and exercises. Learners will receive guidance on codes and patents and review lessons learnt from past successes and failures, developing your skills for installation projects.

Learning outcomes

  • Explain the principles and processes of pipeline fabrication and installation using reel-lay
  • Identify and assess the key design aspects of the reeling process, such as the implications of cumulative plastic strain, ovalisation and weld defects, while listing the key pitfalls
  • Calculate the required tensions and forces in the pipeline and on associated equipment during reeling, and also the limits for these forces to prevent failure
  • Explain how strain concentrations can form during the reeling process, the potential effects of these concentrations and the safeguards against them
  • Specify materials and qualification testing for pipe installed by reel-lay

View course contents
timer icon Duration 4 Days
clock Study Hours 28

About the Tutor

Mike Hawkins
BTech (Hons) CEng FIMechE

Mike has over 30 years’ experience in the oil and gas industry and is Jee’s Technical Director. He has particular expertise in design, pipeline buckling, third party verification, freespan and FE analysis and fatigue assessment. 

Mike teaches the Construction of subsea pipelines and Installation calculations of subsea pipelines course.

Jee Star Logo Reeling calculations - course contents

Day 1

Reel lay process

  • Reel-lay system configuration
  • Spooling
  • Installation
  • Lay down

Reeling history and current market

  • History and development of reeling
  • Reeling ships and companies around world

Case studies: failures and successes

  • Canapu pipe-in-pipe success
  • Åsgard field joint buckling failure
  • Foinaven twisting problem
  • Tambar stress cracking failure
  • Nile insulation success
  • Dahlia spool site set-up success

Day 2

Key technical aspects

  • Strain concentration
  • Material qualification
  • Weld defects
  • Ovalisation
  • Reeling forces
  • 13% chrome pipe
  • Clad pipe
  • Plastic-lined pipe

Codes and patents

  • Codes relating to reeling
  • Around the world
  • Patents related to reeling

Reeling forces

  • Force to reel-on
  • Stresses once reeled-on
  • Elastic energy in reel
  • Force needed to straighten
  • Gripping force
  • Worked example
  • Stationary versus traversing straightener

Day 3

Strain-concentration effects

  • Stress-strain curves
  • Effect of strain on material properties
  • Plastic behaviour during reeling
  • Geometric discontinuities
  • Material strength discontinuities
  • Lay process control methods
  • Strain concentrations at discontinuities
  • Safeguards


  • Ovalisation and recovery
  • Collapse pressure and combined loading
  • Worked example

Day 4

Material and weld defects

  • Welding methods
  • Welding procedures
  • Inspection methods for welds
  • Defect assessment methods
  • Worked example – crack growth during reeling
  • Exercise – effect of load cycling on root crack weld fatigue life
  • DNV ECA methodology


  • Optimised reeled pipe design
  • Cost-effective reeling
  • Deep water pipeline and riser
  • SCR hybrid installation
  • Clad pipe qualification
iso 14001 logo FPAL logo UVDB logo

All Rights Reserved © Jee Ltd 2020