Soil-Pipeline interaction on the seabed
Speaker:Dr. Johnny C Y Cheuk
Assistant Professor
Department of Civil Engineering
The University of Hong Kong
Date & Time:21 Apr 2009 (Tuesday) 14:30
Venue:Auditorium II (Library)

Abstract

Thermal buckling has been a major concern for pipeline designers. The extreme operating conditions, involving high temperature and pressure, tend to cause thermal expansion in the flowline. This leads to a vulnerability to buckling if such expansion is restricted by the frictional resistance along the soil-pipe interface. Trenching and burial has been a conventional approach to avoid thermal buckling. This method can, however, be very expensive or even infeasible in deepwater. A more efficient solution to relieve the axial stress created by thermal expansion is to leave the pipe unburied and control the formation of lateral buckles along the flowline. This cost effective design concept requires thorough understanding of the interaction between the seabed and the partially embedded pipeline under lateral movement. This seminar describes the research that looks into the novel design method for tackling thermal buckling in offshore pipelines. The behaviour of a partially embedded pipe subjected to large amplitude cyclic loading has been investigated using full-scale and reduced-scale centrifuge physical models. The key phases involved have been identified and simple design equations have been suggested for lateral buckling design.

Biography

Dr Johnny Cheuk was educated in Hong Kong before obtaining his PhD from Cambridge University, UK. He is currently an Assistant Professor at the Department of Civil Engineering of the University of Hong Kong. Prior to joining HKU, he had worked for Maunsell Geotechnical Services Limited and City University of Hong Kong. He now serves on several committees, including the Geotechnical Division of the Hong Kong Institution of Engineers and the Association of Geotechnical and Geoenvironmental Specialists.