Designing large-diameter deepwater pipelines

Thomas Dronkers, Dr. Ping Liu, Martijn van Driel, Arjen Meijer, and Shirley Zhou,Intecsea BV

A recent study on large-diameter pipelines in deepwater required a detailed evaluation of the parameters critical to the design of wall thickness and buckle arrestors. While it is evident that smaller wall thickness will reduce line pipe costs, the study was required because the required wall thicknesses derived from conventional design are on the limits of mill capabilities and installation feasibility.

Recent studies on wall thickness optimization and contributions to improved material characterization and collapse prediction have been based on collapse testing. The results, sometimes translated in improved production control, have been applied with success in the past. Other developments have focused on the structural response of pipelines in the sagbend during installation. The authors discuss the feasibility of combining different technological advances to the design of deepwater pipelines. These advances include recovery of collapse resistance due to thermal aging, maximum initial ovality, maximum allowable bending strain in the sagbend, and application of a partially displacement-controlled condition in the sagbend.

Tuesday, 12:00 - 12:30 - ROOM E103

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