merged

Effect of Corrosion Depth Lateral Buckling on Offshore Pipeline
Tuan Nor Dalilah bt Tuan Ibrahim
Supervisor: Dr. Mohd Hairil Bin Mohd
Bachelor of Applied Science (Maritime Technology)
School of Ocean Engineering
Universiti Malaysia Terengganu
Lateral buckling occurs as the subsea pipelines operating at high temperature. The
curvature and high strains in buckled pipelines can cause ovalisation, wrinkling and
fracture. Additionally, low cycle fatigue and ratcheting may result from cyclic
operation. Local corrosion is one of the factors affect the levels of strain generated by
thermal buckling. To investigate the effect of local corrosion lateral buckle caused by
thermal expansion on-linear, Finite Element study used. The study considered a thick
wall 6” pipeline, trenched not buried. ABAQUS Finite Element package used in this
analysis. The start-up and shutdown of a thermally buckled pipeline result in large
variations in bending stress. Local corrosion can increase the bending strains in
buckling. The large variations in bending stresses may result in low fatigue lives. This
analysis has demonstrated these features and this type of behaviour can be effectively
modelled using finite element methods be shown.
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