Digitalisation of maritime operations has led to the number of bridge alarms increasing by 197 per cent in less than two decades up to sometimes 74 alarms per hour. This often creates critical alarm flooding leading to poor decision making, reveals new Lloyd’s Register research.
The number of alarms on board ships must be rationalised to ensure they support officers’ and watchkeepers’ operational decision-making capabilities and are not a distraction or irritation, finds new research conducted by Lloyd’s Register (LR).
Bridge alarm data analysis shows a 197 per cent increase per hour in alarms whilst a vessel is in open sea, compared to nearly two decades ago. The investigation also revealed that there are seventy per cent and six per cent more alarms in coastal waters and confined waters respectively compared to twenty years ago.
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Real-world data
The research was carried out as part of LR’s “Alarm Management in the Maritime Industry” report drawing on real-world data gathered from 65 watchkeeping officers from fifteen ships operated by ten independent companies. Data collected as part of the investigation was compared with the crew’s own perceptions of the impact of alarms on their work.
On the ship’s bridge, peak rates were found to be 74 alarms per hour in a situation requiring high levels of concentration of the navigating officers. For engine room alarms, certain ship segments were experiencing an average of 2500 machinery alarms per day, with peak daily rates seen at 22,500.
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Alarm fatigue
Digitalisation of maritime operations has led to increasing numbers of technologies and sensors being fitted to ships, often with alarm functions. The excessive number of alarms now on board often leads to alarm fatigue and can adversely affect officers’ operational awareness and performance on board, says the research. There are currently no regulatory instruments mandating justification of the safety credit claimed by alarms.
The study also demonstrates the advantages of alarm systems, and how they can support crews both during normal operations and in demanding situations. It also asserts that alarm frequency should be better monitored and controlled to ensure maximum utility is gained from the software.
‘This investigation reveals the unintended consequences of many uncoordinated alarm requirements being assembled together in a ship system,’ says Duncan Duffy, LR’s global head of Technology, Electrotechnical Systems and Digitalisation. ‘There is an obvious need for some alarms, but confusion regarding necessary actions or uncertainty regarding root causes can lead or contribute to serious incidents. This comprehensive study represents a key step in addressing these challenges.’
Industry task force
Following the results of this investigation, LR and a selection of partners have created an industry task force to research adjacent industry approaches and assess their suitability for managing alarm systems in the maritime context funded by the Danish Maritime Fund.
The research is part of LR’s Digital Transformation Research programme, specifically designed to provide in-depth analysis of key opportunities and challenges for maritime digitalisation.
Picture: Bridge equipment of a US Navy vessel (by US Navy).
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