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Design Approach for CALM Buoy Moored Vessel in Squall Conditions

[+] Author Affiliations
Alison Brown

Shell Research Limited, Aberdeen, UK

Ward Gorter

Shell Global Solutions International B.V., Rijswijk, Netherlands

Mark Paalvast, Jelte Kymmell

MOCEAN OFFSHORE BV, Amsterdam, Netherlands

Paper No. OMAE2016-54826, pp. V001T01A012; 8 pages
  • ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology; Offshore Geotechnics
  • Busan, South Korea, June 19–24, 2016
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4992-7
  • Copyright © 2016 by ASME


This paper focuses on examining the response of a vessel moored to a Catenary Anchor Leg Mooring (CALM) buoy in squall conditions. This type of mooring arrangement is typically a temporary mooring used for loading and offloading product or a temporary arrangement used during construction and typically selected for shallow water locations, often in tropical environments when conditions are otherwise relatively benign. Squalls are mesoscale convective systems that cause rapid increases in wind speed and are often associated with large changes in wind direction and also occur mostly in tropical environments. Hence for some locations squall events are the design drivers for this mooring arrangement and are particularly important due to the imperfect squall forecasts available to the industry. To understand the risks in a squall environment the vessel-CALM buoy system is modelled for a range of both squall conditions and associated environmental conditions, covering typical associated wave and current conditions by season and direction. A response-based approach is used to determine the design parameters for the extreme loads, extrapolated using a peak over threshold (POT) approach and using a Generalized Pareto Distribution (GPD), for the vessel-CALM buoy system. The method for this approach is described in detail and contrasted with previous industry approaches.

Copyright © 2016 by ASME
Topics: Design , Mooring , Vessels , Buoys



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