Paper Title: Reliabilty Engineering in Survey and Maintenance of Sailing Yacht Rigs
M Orlando, Naval Architect, Italy
D Boote, University of Genova, Italy
F Faloci, RINA Services, Genova, Italy
Modern sailing boats are designed to reach high speeds, however, the main challenge is to achieve high technical performance while also maintaining good reliability to provide a high level of safety. Recently, Classification Societies and statutory requirements have given more attention to the certification of spars and rigging, in fact the increasing size of sailing superyachts, their rising costs and a growing focus on safety have led designers, shipyards and ship owners to no longer underestimate the importance of this issue, which, after sinking, represents the greatest potential risk of life threatening for crewmembers and large economic losses for the owner.
The Pareto Principle states that, for many events, 20% of input (resources, effort, etc.) accounts for 80% of output (result, rewards, etc.). The aim of this work is, in fact, to investigate on the 20% of the rig elements that cause the 80% of rig failures and to select the best maintenance program to reduce these failures. This is important because useless maintenance is neither time nor cost effective: by selecting and maintaining the most important rig elements there will be a great safety improvement without wasting time focusing on those unnecessary items whose failure doesn’t comport a big loss in the yacht operability and that could be easily replaced once they break. The aim of the present investigation is then to set up a rational method to optimize the verification procedure of a complex rig system.
In the first phase of this study a statistical analysis of a significant dismasting database has been collected and examined in order to statistically highlight the key elements related to rigs reliability. In the second phase some representative Southern Wind yachts have been assumed as study cases to simulate rig elements failures with a CFD/FEM integrated software. Finally a FMECA and a risk analysis and element prioritisation have been performed.
The provided results can be helpful to Classification Society to plan a set of different rules requirements and to select the most critical items that will be surveyed and tested by a class surveyor.
Transactions RINA, Vol 159, Part B1, International Journal of Small Craft Technology, Jan-Jun 2017
DOI No: 10.3940/rina.ijsct.2017.b1.198
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