Dimitris Konovessis

Risk evaluation for RoPax vessels

The paper presents the results of a recent risk evaluation study for roll‐on‐roll‐off passenger (RoPax) vessels, carried out as part of the activities of the SAFEDOR Integrated Project. The objective of the study was to investigate hazards and their causes during RoPax operation and to quantify, to the extent possible, their frequencies and consequences. A previous study on the safety assessment of RoPax vessels sailing in north‐west European waters, covering the period until 1994, was used as the basis in putting together a high‐level risk model for the current study. All scenarios are presented in the form of event trees, quantification of which is made on the basis of worldwide accident experience (from 1994 to 2004), relevant past studies, and judgement. The study estimates the risk of loss of life among passengers and crew (by calculating for each scenario the individual risk and the potential loss of life and by plotting the corresponding F–N curves) and compares them with current risk acceptance criteria.

Risk analysis for RoPax vessels

The paper presents the results of a recent risk analysis study for RoPax vessels, carried out as part of the activities of the SAFEDOR Integrated Project. The objective of this study was to investigate the causes of hazards during RoPax operation and quantify, to the extent possible, their frequencies and consequences. Potential scenarios initially identified and prioritised during a Hazard Identification (HAZID) session were used in the process.The work has been performed in accordance with the IMO FSA Guidelines (IMO 2002). A previous comprehensive study on the safety assessment of RoPax vessels sailing in North West European waters, covering the period until 1994, was used as the basis in putting together a high-level risk model for the current study. All scenarios are presented in the form of event trees, quantification of which is done on the basis of world-wide accident experience (from 1994 to2004), relevant past studies and judgment. The study estimates the risk of loss of life among passengers and crew (by calculating for each scenario the Individual Risk, the Potential Loss of Life — PLL and plotting the corresponding F-N curves), and compares them with current risk acceptance criteria. The resulting high-level risk model is used to provide recommendations for improvement in the form of proposed risk control options (RCOs).

Stability and safety analysis of the air-lifted catamaran

Abstract The air-lifted catamaran (ALC) is an innovative fast marine transportation concept, comprising the application and variation of a new, skirtless air cushion and air-lubrication, thus rendering it a hybrid between catamaran and surface effect ship (SES). Its features and capabilities are beyond current conventional high-speed monohull and catamaran. The present paper presents pertinent studies on stability concerning this craft, including dynamic stability, stability in turning and directional stability. The stability analysis takes into account air compressibility in the cushion, and is carried out in time domain. Some simulated results are presented and discussed, and requirements for design and operation of the craft based on IMO HSC Code 2000 are briefly outlined.