Abstract
The lubricating oil systems are essential for ensuring the safe and reliable operation of the cruise ships power plants as demonstrated by recent incidents. The aim of this study is to investigate the safety enhancement of a cruise ship lubricating oil system by employing safety, reliability, availability and diagnosability analyses, which are based on the system functional modelling implemented in the MADe™ software. The safety analysis is implemented by combining a Failure Modes, Effects and Criticality Analysis and the systems functional Fault Tree Analysis. Subsequently, Reliability Block Diagrams are employed to estimate the system reliability and availability metrics. The MADe™ toolbox for determining sensors locations is employed for a more advanced diagnostic system development. A number of design modifications are proposed and the alternative configurations reliability metrics are estimated. The derived results demonstrate that the suction strainer and the lubricating oil pump are the most critical system components. Seven additional sensors are proposed to enhance the original system design. Compared with the original system design, the investigated alternative designs exhibit significantly lower probabilities of failure and higher values of availability.
Highlights
According to the European Maritime Safety Agency, the injuries on passenger ships are more frequent in total number than on other ships.[1]
The MADeä software[28] has been selected as the tool for the proposed methodology in this study for the Model-Based safety analysis due to the following reasons: (a) it allows for generating safety analysis results based on the system model much faster than using the traditional methods,[28] (b) it incorporates automated implementation of the traditional FMECA, Fault Tree Analysis (FTA) and Reliability Block Diagrams (RBDs), (c) it includes a library with the various components failure modes, which allows for more rigorous safety analysis, (d) it supports the development of diagnostic tools for the investigated system by proposing sensors locations
A methodology was employed based on a model-based safety analysis approach to analyse and improve reliability, availability and safety of lubricating oil system on a cruise ship
Summary
According to the European Maritime Safety Agency, the injuries on passenger ships are more frequent in total number than on other ships.[1] Other findings from the same study demonstrate that a number of incidences have occurred in the engine room area.[1] At the same time, the engine room and its systems is quintessential for the ship operation as it supports critical ship functions. Banks et al.[4] applied Failure Modes and Effects Analysis (FMEA) method to the diesel engine for the development of relevant diagnostic systems. Cicek et al.[6] used the FMEA for the ship fuel oil system safety analysis identifying the potential failure modes and developing a risk-based preventive maintenance planning.
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