A novel design procedure for jacket installations
- Kvaerner Earl and Wright, London (United Kingdom)
- Hydraulic Inst., Hoersholm (Denmark)
In the summer of 1994 the jacket and topsides for Total Oil Marine`s Dunbar field in the UK sector of the North Sea were successfully installed by Heeremac`s heavy lift barge DB102. The jacket was lifted off the transportation barge, upended from horizontal to vertical using a crane assisted ballasting procedure, and then installed in two steps over four pre-installed under-leg piles. The installation of the jacket was challenging since the life was utilizing the full crane capacity and also due to the soil conditions at the location, which made the docking procedure critical to achieve the required installation tolerances for tie-back of the pre-drilled wells. The SSCV assisted installation procedure was carefully deigned and analyzed by numerical calculations supplemented and supported by extensive physical model testing. This paper addresses the model test methodology with emphasis on the innovative procedures for testing and analyzing random, non-linear phenomena: impact loads during jacket lift-off from the barge and between jacket and piles during docking. The test program and the analysis demonstrated the importance of providing not just a single value but a sample of extreme values for a proper assessment of design loads that are generated by non-linear random processes. Whereas the results from the tests are specific for the jacket structure, the methodology is of general use for the industry.
- OSTI ID:
- 194685
- Report Number(s):
- CONF-950695-; ISBN 0-7918-1307-X; TRN: IM9611%%187
- Resource Relation:
- Conference: International conference on offshore mechanics and arctic engineering, Copenhagen (Denmark), 18-22 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of OMAE 1995 -- Proceedings of the 14. international conference on offshore mechanics and arctic engineering. Volume 1, Part B: Offshore technology; Chakrabarti, S.K. [ed.] [Chicago Bridge and Iron Technical Services, Plainfield, IL (United States)]; Gudmestad, O.T. [ed.] [Statoil, Stavanger (Norway)]; Sparks, C. [ed.] [Inst. Francais du Petrole, Rueil-Malmaison (France)]; Morrison, D.G. [ed.] [Shell E and P Technology Co., Houston, TX (United States)]; PB: 539 p.
- Country of Publication:
- United States
- Language:
- English
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