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Hydrodynamic and Safety Aspects of Mooring Line Anchors in Accidental Free Fall

[+] Author Affiliations
Halvor Lie, Ivar Fylling, Erik Lehn

MARINTEK, Trondheim, Norway

Paper No. OMAE2009-80168, pp. 871-878; 8 pages
doi:10.1115/OMAE2009-80168
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

The paper presents an initial study on anchor behavior in accidental free fall. The work is related to a deepwater field development located at around 1000 m depth offshore Norway, where one wants to be able to anchor floating units for drilling vessels. As input to the present study data from model tests performed more than a decade ago were used. Here two anchor models were tested in free fall at a moderate water depth of 300 m. Results from the test are presented and discussed. Statistical distributions of the horizontal excursion for two anchor types are established. Because of limited instrumentation only some initial estimates of the free falling speed could be established. In order to determine how the results can be used for deeper water, a statistical approach for estimation of the hit position at sea bed for various water depths is outlined. Some examples on how the excursion develops for various water depths are given, based on the model test results and the statistical approach. Also a statistical model of damage risk to seabed structures by falling anchors is discussed.

Copyright © 2009 by ASME

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