Abstract
The on-bottom stability design of subsea pipelines and cables is important to ensure safety and reliability but can be challenging to achieve, particularly for renewable energy projects which are preferentially located in high energy metocean environments. Often these conditions lead to the seabed being stripped of all loose sediment, leaving the cables to rest on exposed bedrock where roughness features can be similar in size to the cables. As offshore renewable energy projects progress from concept demonstration to commercial-scale developments, new approaches are needed to capture the relevant physics for small diameter cables on rocky seabeds to reduce the costs and risks of export power transmission and increase operational reliability. These same considerations also apply to the cables and small diameter pipes – such as umbilicals – required by oil and gas projects located on rocky seabeds. Recent experimental testing using the University of Western Australia's unique Large O-tube has enabled the experimental measurement of hydrodynamic forces on small diameter cables and pipes in proximity to smooth and rough beds. The tested conditions extend well beyond the existing published parameter range including much higher KC conditions together with seabed roughness which is comparable in size to the diameter. The results provide design data of great relevance to the ongoing development of marine renewable and conventional oil and gas projects, especially on rocky seabeds. This paper presents a summary of the existing knowledge on the subject as a preface to preliminary test results and gives tentative conclusions on the likely outcomes from this work.
| Original language | English |
|---|---|
| Title of host publication | Pipelines, Risers, and Subsea Systems |
| Place of Publication | UK |
| Publisher | The American Society of Mechanical Engineers (ASME) |
| ISBN (Electronic) | 9780791858813 |
| DOIs | |
| Publication status | Published - 1 Jan 2019 |
| Event | ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019 - Glasgow, United Kingdom Duration: 9 Jun 2019 → 14 Jun 2019 |
Publication series
| Name | Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE |
|---|---|
| Volume | 5B-2019 |
Conference
| Conference | ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2019 |
|---|---|
| Country | United Kingdom |
| City | Glasgow |
| Period | 9/06/19 → 14/06/19 |
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Hydrodynamic forces on near-bed small diameter cables and pipelines in currents, waves and combined flow. / Griffiths, Terry; Teng, Yunfei; Cheng, Liang; An, Hongwei; Draper, Scott; Mohr, Henning; Fogliani, Antonino; Mariani, Alessio; White, David.
Pipelines, Risers, and Subsea Systems. UK : The American Society of Mechanical Engineers (ASME), 2019. (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE; Vol. 5B-2019).Research output: Chapter in Book/Conference paper › Conference paper
TY - GEN
T1 - Hydrodynamic forces on near-bed small diameter cables and pipelines in currents, waves and combined flow
AU - Griffiths, Terry
AU - Teng, Yunfei
AU - Cheng, Liang
AU - An, Hongwei
AU - Draper, Scott
AU - Mohr, Henning
AU - Fogliani, Antonino
AU - Mariani, Alessio
AU - White, David
PY - 2019/1/1
Y1 - 2019/1/1
N2 - The on-bottom stability design of subsea pipelines and cables is important to ensure safety and reliability but can be challenging to achieve, particularly for renewable energy projects which are preferentially located in high energy metocean environments. Often these conditions lead to the seabed being stripped of all loose sediment, leaving the cables to rest on exposed bedrock where roughness features can be similar in size to the cables. As offshore renewable energy projects progress from concept demonstration to commercial-scale developments, new approaches are needed to capture the relevant physics for small diameter cables on rocky seabeds to reduce the costs and risks of export power transmission and increase operational reliability. These same considerations also apply to the cables and small diameter pipes – such as umbilicals – required by oil and gas projects located on rocky seabeds. Recent experimental testing using the University of Western Australia's unique Large O-tube has enabled the experimental measurement of hydrodynamic forces on small diameter cables and pipes in proximity to smooth and rough beds. The tested conditions extend well beyond the existing published parameter range including much higher KC conditions together with seabed roughness which is comparable in size to the diameter. The results provide design data of great relevance to the ongoing development of marine renewable and conventional oil and gas projects, especially on rocky seabeds. This paper presents a summary of the existing knowledge on the subject as a preface to preliminary test results and gives tentative conclusions on the likely outcomes from this work.
AB - The on-bottom stability design of subsea pipelines and cables is important to ensure safety and reliability but can be challenging to achieve, particularly for renewable energy projects which are preferentially located in high energy metocean environments. Often these conditions lead to the seabed being stripped of all loose sediment, leaving the cables to rest on exposed bedrock where roughness features can be similar in size to the cables. As offshore renewable energy projects progress from concept demonstration to commercial-scale developments, new approaches are needed to capture the relevant physics for small diameter cables on rocky seabeds to reduce the costs and risks of export power transmission and increase operational reliability. These same considerations also apply to the cables and small diameter pipes – such as umbilicals – required by oil and gas projects located on rocky seabeds. Recent experimental testing using the University of Western Australia's unique Large O-tube has enabled the experimental measurement of hydrodynamic forces on small diameter cables and pipes in proximity to smooth and rough beds. The tested conditions extend well beyond the existing published parameter range including much higher KC conditions together with seabed roughness which is comparable in size to the diameter. The results provide design data of great relevance to the ongoing development of marine renewable and conventional oil and gas projects, especially on rocky seabeds. This paper presents a summary of the existing knowledge on the subject as a preface to preliminary test results and gives tentative conclusions on the likely outcomes from this work.
UR - http://www.scopus.com/inward/record.url?scp=85075840706&partnerID=8YFLogxK
U2 - 10.1115/OMAE2019-95557
DO - 10.1115/OMAE2019-95557
M3 - Conference paper
T3 - Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
BT - Pipelines, Risers, and Subsea Systems
PB - The American Society of Mechanical Engineers (ASME)
CY - UK
ER -