the new SOLAS requirements (in force from 1 July 2010 for ships of 120m long or with three or more main fire zones), which call for passenger ships to retain an ability to return safely to port in the event of an accident, flooding damage or fire, following the loss of one watertight compartment or the loss of one space bounded by A-class bulkheads. Cruiseships must retain propulsion,


steering, navigation and fuel systems so that they are able to sail 1000 miles to port while retaining essential passenger services, including access to lifesaving apparatus, also communication and firefighting capacity. Ferries likewise have to comply, and in this respect Deltamarin has carried out 3D modelling on P&O’s new ferries for the Dover Strait service, which are on order at STX Europe (formerly Aker Yards) in Finland. Here, because of the short route, the overall complexities are much reduced.


A 3D parametric model allied to


a goal-based approach, also using optimisation and simulation tools, can be most helpful here, yielding a hull with a higher level of safety, better functionality and lower construction costs for both yard and owner. Furthermore, the model can be used by the owner aſter delivery for training and retained for any later conversion or modification. Deltamarin has already used the 3D


approach in Return to Port work with Royal Caribbean to determine parameters for all spaces, all equipment and all systems, studying each compartment individually. Once again, the 3D technique shows benefits in graphic design, as a training tool and for onboard maintenance. In a typical study, Deltamarin analysed


the results of the total loss, on a large cruiseship, of the forward machinery


space, one switchboard room and a forward service space which, apart from loss of electrical power, also limited the volume of potable water and lost the black water collection service. Detailed graphics of available services were able to be displayed, identifying those sections which were not working. Of course, should the ship be modified or converted at a later date, the model could easily be redeployed, while it can also assist owners to ensure that their ship complies with any Port State Control requests. For some years now, Deltamarin has


worked in association with the Scottish consultancy, Safety at Sea, on a safety based approach to ship design, and the latter company’s input has been of great help in evolving the 3D product model concept. Tis has been used in the stages leading up to basic design –outline project, project development and contract project.NA


Napa CAD spin-off powers NCL


Napa Power, the operating and monitoring tool developed by Onboard- Napa, Ltd is now installed across the entire Norwegian Cruise Line (NCL) fleet.


I


nitial piloting of the Napa Power monitoring tool provided such positive feedback that Norwegian Cruise Lines


has extended its use across its entire fleet. Te system is installed with the Speed


Pilot module, which allows automatic control to optimise ship speed. Precise speed control saves fuel and will reduce workload on the bridge. “Conserving fuel on our ships sailing


around the world is particularly important,” says Captain Niklas Peterstam, NCL vice president, nautical operations. “Napa Power has enabled us to optimise speed, and in doing so, we are minimising our fuel consumption.” Acual fuel consumption, engine and


navigational data are collected and forwarded to the Napa office web portal for further analysis and reporting purposes. Napa Power is based on an accurate Napa


model of the ship. Te model, combined with weather and current forecasts, gives


The Naval Architect April 2009


Norwegian Gem, one of the ships to use Napa Power.


precise performance calculations. Napa Power is based on the same ship design system that is used by shipyards, ship design consultancies, navies and classification


societies. In addition to the Napa model, all available model test data and full-scale trial data are used to perfect Napa Power’s accuracy. NA


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