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Probabilistic Red Limit Study for Mobile Offshore Drilling Units

[+] Author Affiliations
Tony Gjerde

Lloyd’s Register Consulting, Kjeller, Norway

Haibo Chen

Lloyd’s Register Consulting, Beijing, China

Paper No. OMAE2014-24614, pp. V04BT02A048; 7 pages
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 4B: Structures, Safety and Reliability
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4543-1
  • Copyright © 2014 by ASME


More and more mobile offshore drilling units (MODUs) are equipped with dynamic positioning (DP) system to maintain vessel position during drilling and well operations. A failure in the DP system might in worst case lead to position loss in terms of drive-off or drift-off. In a position loss scenario, the operator needs to activate the emergency disconnect sequence (EDS) of the marine riser at the time when the vessel reaches a site specific critical distance, denoted the red limit. The red limit distance takes into account the time it takes for the EDS sequence to complete, in addition to the vessel position loss speed and the physical excursion limit for the marine riser, BOP and wellhead system.

The red limit is a site-specific parameter, which is dependent on many factors. This paper presents an alternative probabilistic methodology to determine the red limit based on probabilistic modeling of position loss scenarios, using a case study of DP class 3 drilling vessels at specific well sites and environmental conditions.

Copyright © 2014 by ASME



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