Brankovic M.,JP Kenny Pty Ltd. |
Zeitoun H.,JP Kenny Pty Ltd. |
Sutherland J.,HR Wallingford |
Pearce A.,Woodside Energy |
And 5 more authors.
Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE | Year: 2010
One of the aspects of pipeline design is ensuring pipeline stability on the seabed under the action of environmental loads. During the 1980s, significant efforts were made to improve the understanding of hydrodynamic loads on single pipeline configurations on the seabed (Reference 1). The stability of piggyback (bundled) pipeline configurations is less well understood, with little quantitative data readily available to the design engineer for practical application in engineering problems (References 2-6). This paper describes an extensive set of physical model tests performed for piggyback on-seabed and piggyback-raised-from seabed (spanning or lifting pipeline) configurations to determine hydrodynamic forces in combined wave and current conditions. The piggyback is nominally in the 12 o'clock position. The well-established carriage technique was used, in order to obtain data for use in full-scale stability modelling. The model tests are benchmarked against existing test data, to confirm the validity of the test method. Key findings are presented in terms of non-dimensional coefficients, and force time histories for the vertical and horizontal forces. A brief interpretation of the hydrodynamic load behaviour of the Piggyback System is provided by considering the physical flow mechanisms causing the force time history variation; furthermore the influence of the seabed separation on the piggyback loads is also discussed. © 2010 by ASME.
Cumming G.,J P Kenny Pty. |
Brown N.,J P Kenny Pty.
Frontiers in Offshore Geotechnics II - Proceedings of the 2nd International Symposium on Frontiers in Offshore Geotechnics | Year: 2011
Several design approaches can be used to analyse the interface between offshore pipelines and the seabed. This paper summarises some key areas of pipeline design that require the implementation of geotechnical techniques and the state of the art research and testing of the behaviour of that pipeline/foundation interface. The integration of the response of the pipeline to the behaviour of the foundation is a critical interface between pipeline engineers and geotechnical engineers, which requires open and productive dialogue to solve often complex interaction scenarios. © 2011 Taylor & Francis Group, London.