Propagation buckling in deep sub-sea pipelines

The paper investigates buckle propagation in deep sub-sea pipelines. Experimental results are presented using ring squash tests and hyperbaric chamber tests, and are compared with a modified analytical solution and with numerical results using finite element analysis. The experimental investigation was conducted using commercial aluminium pipes with diameter-to-thickness (D/t)(D/t) ratio in the range 20–48. In contrast to conventional cylindrical pipe, a faceted cylindrical geometry is also investigated. Preliminary analysis of a faceted pipe shows that a substantial increase in buckling capacity can be achieved for the same D/tD/t ratio.

► The paper investigates buckle propagation in deep sub-sea pipelines.
► Experimental results are presented using ring squash tests and hyperbaric chamber tests.
► A modified analytical solution and numerical results are compared with experimental results using finite element analysis.
► In contrast to conventional cylindrical pipe, a faceted cylindrical geometry is proposed.
► Preliminary analysis of a faceted pipe shows that a substantial increase in buckling capacity can be achieved for the same D/tD/t ratio.