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Effect of Forecastle, Bulwark and Sheer on Probabilities of Green Sea Occurrence on Deck of a Typical Aframax and Suezmax Sized Hulls

[+] Author Affiliations
Vaibhav Parsoya, Thomas Ward

Fairlead Maritime Ltd, London, UK

Jonathan Bailey

BP Shipping, Sunbury on Thames, Middlesex, UK

Paper No. OMAE2014-23011, pp. V08AT06A001; 8 pages
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 8A: Ocean Engineering
  • San Francisco, California, USA, June 8–13, 2014
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-4550-9
  • Copyright © 2014 by ASME


A study resulting in qualitative and quantitative information about the effect of forecastle and sheer is presented in this paper. This is based on a linear direct calculation and extends the work of the JIP on F(P)SO Green water loading described in Buchner (2002) by including forward speed effects. The approach calculates Relative Wave Elevation (RWE) from a linear 3D diffraction analysis and adds nonlinear corrections by way of non-linear response spectra of RWE. The probabilities of green sea occurrence are calculated for variable heights of forecastle/sheer, vessel draft, vessel speed and sea depth for relative heading and mean zero upcrossing wave period for sea states on typical tanker routes (Arabian Gulf to Bass Strait (South East Australia), North East (Global Wave Statistics European Data set Areas 5 and 15 with 90m water depth), IACS Common Structural Rules North Atlantic, Lloyds Register 100A1 and Alaska (Trans-Alaska Pipeline System) to Long Beach). This comparison is done on one typical sized Aframax and Suezmax hull. A downtime in hours over 25 years of design life in 3 hours sea state is also computed which can be a direct input to the risk matrix analysis.

Copyright © 2014 by ASME
Topics: Probability , Seas , Hull



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