Operational integrity of pipelines on mobile seabeds: Using survey data to explore trends of changing pipeline embedment and span evolution

Zhechen Hou, Fraser Bransby, Phil Watson, David White, Han Eng Low, Andrew Rathbone

Research output: Chapter in Book/Conference paperConference paperpeer-review

Abstract

Reliable prediction of as-laid embedment and changes in embedment with time for surface-laid offshore pipelines and cables are important for the assessment of their operational response. This study interprets the field data from three sections of the same pipeline route from ROY inspection surveys that took place from the as-laid condition to around six years after installation. The analysis results indicate significant changes of both span ratio (i.e., the proportion of the length that is in span) and the range of embedment of the grounded sections. These changing trends differ between sections of the same pipeline, and include both growing and reducing proportions of span, as well as no formation of spans. In all cases, the average embedment of the non-spanning sections increases with time, and there is a net increase in the stability of the pipeline under hydrodynamic loading. These observations illustrate the importance of understanding the pipeline, metocean and seabed conditions when making predictions of long-term pipeline performance.
Original languageEnglish
Title of host publicationProceedings of the 9th International Offshore Site Investigation and Geotechnics Conference
Subtitle of host publicationInnovative Geotechnologies for Energy Transition
Place of PublicationLondon
Pages563-572
Number of pages8
Volume1
Publication statusPublished - 2023
Event9th International Offshore Site Investigation and Geotechnics Conference - Imperial College, London, United Kingdom
Duration: 12 Sept 202314 Sept 2023

Publication series

NameOffshore Site Investigation and Geotechnics
PublisherSociety for Underwater Technology
ISSN (Print)2754-6322

Conference

Conference9th International Offshore Site Investigation and Geotechnics Conference
Abbreviated titleOSIG 2023
Country/TerritoryUnited Kingdom
CityLondon
Period12/09/2314/09/23

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