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Motion Behaviour of a New Offshore LNG Transfer System at Harsh Operational Conditions

[+] Author Affiliations
Günther F. Clauss, Florian Sprenger, Daniel Testa

Technical University of Berlin, Berlin, Germany

Sven Hoog, Roland Huhn

IMPaC Offshore Engineering, Hamburg, Germany

Paper No. OMAE2009-79391, pp. 385-393; 9 pages
doi:10.1115/OMAE2009-79391
From:
  • ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology
  • Honolulu, Hawaii, USA, May 31–June 5, 2009
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4341-3 | eISBN: 978-0-7918-3844-0
  • Copyright © 2009 by ASME

abstract

Today, the demand of natural gas from offshore fields is on a high level and still increasing. Floating turret moored terminals receive gas directly from the field via risers and liquefaction is achieved by on-board processing plants. The LNG (liquefied natural gas) is transferred to periodically operating shuttle carriers for onshore supply. This paper presents an innovative offshore LNG transfer system, based on newly developed flexible cryogenic pipes of 16″ inner diameter, which allow fast loading/offloading procedures in tandem configuration (see Fig. 1), even in harsh environmental conditions. The motion characteristics of the proposed concept are investigated in detail by the potential theory programmes WAMIT and ANSYS AQWA, respectively, with the focus on the dynamic behaviour of the multi-body system in waves. Each vessel is generating its own radiation and diffraction wave field affecting the motions of the adjacent vessels and vice versa. Results from calculations in the frequency and time domain are compared and show good agreement. Tolerable relative motions between terminal and carrier are limited by maximum torsion and bending of the flexible transfer pipe. Based on given limiting parameters, the operational range of the system and the annual expected downtime is exemplarily calculated for a location in the north sea. Finally, second-order forces — induced by drift motions — on the mooring lines between carrier and terminal are presented as time series for a three-hour sea state.

Copyright © 2009 by ASME

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