Capsize Safety Assessment of Inshore Fishing Vessels

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TypeTechnical Report
Series titleTechnical Report
SubjectInshore fishing vessels; capsize limits; ship motion prediction
AbstractThe current Canadian regulations for fishing vessel stability meet the accepted international standards for fishing boats provided by the International Maritime Organization (IMO, 1993). However, the geometric proportions of Canadian boats, especially in Newfoundland, are extreme, with very wide beams and very high decks. It is not clear that a hydrostatic analysis alone is sufficient to assess the capsize safety of these vessels. The intention of this research was to compare the effectiveness of the current hydrostatic assessment of fishing vessel stability against more realistic cases by including the dynamics of the vessel in waves. The analysis was carried out using a computer code for predicting ship motions, up to and including a capsize. The results of the analysis showed that the value of righting arm (GZ) at 40 degrees of heel had an effect on the vessels ability to survive in waves. Vessels that met the requirements of STAB 4 but had the lowest values of GZ from 30 to 40 degrees heel were predicted to capsize in lower waves than vessels with high values of GZ in the same range. Other factors that affected survivability were the amount of superstructure fitted to the ship and the steepness of the waves.
Publication date
PublisherNational Research Council Canada. Institute for Ocean Technology
PlaceSt. John's, NL
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedNo
NRC number6538
NPARC number8894896
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Record identifier87701f56-d80f-49af-bf3a-d502408580be
Record created2009-04-22
Record modified2016-10-03
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