There is an increasing demand for subsea electrical power transmission in the oil- and gas industry. Electrical power is mainly required for subsea pumps, compressors and for direct electrical heating of pipelines. The majority of subsea processing equipment is installed at water depths less than 1000 meters. However, projects located offshore Africa, Brazil and in the Gulf of Mexico are reported to be in water depths down to 3000 meters. Hence, Nexans initiated a development programme to qualify a dynamic deep water power cable. The qualification programme was based on DNV-RP-A203. An overall project plan, consisting of feasibility study, concept selection and pre-engineering was outlined as defined in DNV-OSS-401. An armoured three-phase power cable concept assumed suspended from a semi-submersible vessel at 3000 m water depth was selected as qualification basis. As proven cable technology was selected, the overall qualification scope is classified as class 2 according to DNV-RP-A203. Presumed high conductor stress at 3000 m water depth made basis for the identified failure modes. An optimised prototype cable, with the aim of reducing the failure mode risks, was designed based on extensive testing and analyses of various test cables. Analyses confirmed that the prototype cable will withstand the extreme loads and fatigue damage during a service life of 30 years with good margins. The system integrity, consisting of prototype cable and end terminations, was verified by means of tension tests. The electrical integrity was intact after tensioning to 2040 kN, which corresponds to 13 000 m static water depth. A full scale flex test of the prototype cable verified the extreme and fatigue analyses. Hence, the prototype cable is qualified for 3000 m water depth.
Skip Nav Destination
ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
June 19–24, 2011
Rotterdam, The Netherlands
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-4436-6
PROCEEDINGS PAPER
Mechanical Qualification of Dynamic Deep Water Power Cable
Stian Karlsen,
Stian Karlsen
Nexans Norway AS, Halden, Norway
Search for other works by this author on:
Per Arne Osborg
Per Arne Osborg
Nexans Norway AS, Oslo, Norway
Search for other works by this author on:
Roger Slora
Nexans Norway AS, Halden, Norway
Stian Karlsen
Nexans Norway AS, Halden, Norway
Per Arne Osborg
Nexans Norway AS, Oslo, Norway
Paper No:
OMAE2011-49945, pp. 769-776; 8 pages
Published Online:
October 31, 2011
Citation
Slora, R, Karlsen, S, & Osborg, PA. "Mechanical Qualification of Dynamic Deep Water Power Cable." Proceedings of the ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Volume 4: Pipeline and Riser Technology. Rotterdam, The Netherlands. June 19–24, 2011. pp. 769-776. ASME. https://doi.org/10.1115/OMAE2011-49945
Download citation file:
27
Views
Related Proceedings Papers
Related Articles
Profiles of Two JOMAE Associate Editors (A Continuing Series)
J. Offshore Mech. Arct. Eng (October,2021)
Fatigue Reliability Analysis for Brace–Column Connection Details in a Semisubmersible Hull
J. Offshore Mech. Arct. Eng (December,2015)
Variable Water Flow Pumping for Central Chilled Water Systems
J. Sol. Energy Eng (August,2002)
Related Chapters
Basic Concepts
Design & Analysis of ASME Boiler and Pressure Vessel Components in the Creep Range
Introduction
History of Line Pipe Manufacturing in North America
Section VIII: Division 2—Alternative Rules
Companion Guide to the ASME Boiler & Pressure Vessel Code, Volume 2, Second Edition: Criteria and Commentary on Select Aspects of the Boiler & Pressure Vessel and Piping Codes