Study on lateral buckling characteristics of a submarine pipeline with a single arch symmetric initial imperfection

Numerical study on upheaval buckling of pipe-in-pipe systems with full contact imperfections

Unburied partially embedded subsea pipelines under high temperature conditions tend to relieve their axial compressive force by forming localised lateral buckles This phenomenon is traditionally studied as a kind of imperfect column buckling problem We study lateral buckling as a genuinely localised buckling phenomenon governed by a different static instability, with a different critical load No ad hoc assumptions need to be made We combine this buckling analysis with a detailed state-of-the-art nonlinear pipe-soil interaction model that accounts for the effect of lateral breakout resistance This allows us to investigate the effect of initial embedment of subsea pipelines on their load-deflection behaviour Parameter studies reveal a limit to the temperature difference for safe operation of the pipeline, in the sense that for higher temperature differences a localised buckling mode has lower total energy than the straight unbuckled pipe Localised lateral buckling may then occur if the pipe is sufficiently imperfect or sufficiently dynamically perturbed

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Localised lateral buckling of partially embedded subsea pipelines with nonlinear soil resistance

Numerical study on lateral buckling of pipelines with imperfection and sleeper

A lateral global buckling failure envelope for a high temperature and high pressure (HT/HP) submarine pipeline

In order to avoid the curing effects of paraffin on the transport process and reduce the transport difficulty, usually high temperature and high pressure are used in the transportation of oil and gas The differences of temperature and pressure cause additional stress along the pipeline, due to the constraint of the foundation soil, the additional stress can not release freely, when the additional stress is large enough to motivate the submarine pipelines buckle In this work, the energy method is introduced to deduce the analytical solution which is suitable for the global buckling modes of idealized subsea pipeline and analyze the relationship between the critical buckling temperature, buckling length and amplitude under different high-order global lateral buckling modes To obtain a consistent formulation of the problem, the principles of virtual displacements and the variation calculus for variable matching points are applied The finite element method based on elasto-plastic theory is used to simulate the lateral global buckling of the pipelines under high temperature and pressure The factors influencing the lateral buckling of pipelines are further studied Based upon some actual engineering projects, the finite element results are compared with the analytical ones, and then the influence of thermal stress, the section rigidity of pipeline, the soil properties and the trigging force to the high order lateral buckling are discussed The method of applying the small trigging force on pipeline is reliable in global buckling numerical analysis In practice, increasing the section rigidity of a pipeline is an effective measure to improve the ability to resist the global buckling

Wenbin Liu

Papers

Study on lateral buckling characteristics of a submarine pipeline with a single arch symmetric initial imperfection

Global lateral buckling analysis of idealized subsea pipelines

A lateral global buckling failure envelope for a high temperature and high pressure (HT/HP) submarine pipeline

Modelling nonlinear time-dependent pipeline walking induced by SCR tension and downslope

Analysis of walking rate for subsea pipelines neighbouring the pipeline end terminations/pipeline end manifolds