Effect of local buckling on burst pressure
conference paper
Rupture of the pipe wall and inadmissible deformations are the two basic failure modes that can he distinguished in pipelines. Rupture can be the result of (a) the fact that the experienced strains exceed the strain capacity of the pipe wall, including less ductile zones in and near the weids and (b) high cycle and/or low cycle fatigue loading. Examples of inadmissible deformations are collapse, local buckles and excessive ovalizations. Deformations caused hy external loads like earth pressure and imposed hending in settlement areas do not affect the burst pressure (failure mode rupture), provided that the pipe wall has sufficient strain capacity. If the strains in local buckles do not exceed the strain capacity, then local buckles do not affect the hurst pressure either. The paper summarizes the theory to support this. Burst test results on pipes with external loads and with local buckles are presented. These tests have demonstrated that if ductility is good, even extremely deep huckles do not affect hurst pressure. Results of finite element calculations to simulate the kending and local huckling hehaviour are presented as well. The consequences of the above findings for the limit state design method are brietly discussed.
TNO Identifier
329175
Source title
Proceedings 6th International Offshore and Polar Engineering Conference, Internatinal Society of Offshore and Polar Engineers, Los Angeles, CA, USA, 26-31 May 1996
Collation
9 p.
Files
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