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Publications
Sobral, J. and Guedes Soares, C. (2024), Determining the frequency of failure-finding tasks for ship critical systems based on the required availability, Advances in Maritime Technology and Engineering, Guedes Soares, C. & Santos T.A. (Eds.), Taylor and Francis, London, UK, pp. 583-590.
Several systems that are installed in ships can be considered critical, once a failure on a critical system may correspond sometimes to huge costs, a lack of safety for the crew, a severe environmental impact or even consequences on ship integrity. Thus, it is important to avoid such failures based on preventive or predictive maintenance, assuring a high reliability and availability of these critical systems. For failures that occur upon a degradation process and where it is possible to monitor some parameter related to that degradation mechanism, it is possible to predict the occurrence and act proactively. However, for hidden failures, mainly related to protective systems, it is difficult to predict it. For these situations, most of time the best way to know if a protective system in a dormant state is in an operational state is to perform failure-finding tasks upon a scheduled maintenance plan. A low frequency plan for these tasks will increase risk and availability, while a high frequency will increase maintenance costs. This paper refers to how to determine the frequency of such failure-finding tasks based on a desired availability, giving an example of a protective system, demonstrating the applicability and impact of the methodology proposed.
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