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HANSA 03-2017

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Schiffstechnik | Ship

Schiffstechnik | Ship Technology Focus on hull performance management To spur development and raise awareness for hull performance monitoring, DNV GL and paint manufacturer Jotun are hosting industry stakeholders to the second Hull Performance & Insight Conference (HullPIC) Hull performance monitoring solutions offer significant fuel savings potential and have prompted growing interest from the maritime industry. This year, the HullPIC conference will take place in Castle Ulrichshusen, in Germany, from 27 to 29 March. Some of the topics to be discussed include the ISO 19030 standard for hull and propeller performance as well as common challenges and solutions that can help shipowners realize potential fuel savings. »We look forward to welcoming industry stakeholders to Castle Ulrichshusen. In March we will pick up where we left off last year,« says Geir Axel Oftedahl, Director of Business Development at Jotun Marine and project manager of the ISO 19030 working group. ISO 19030 was published in November 2016. The standard outlines general principles for the measurement of changes in hull and propeller performance and defines a set of performance indicators for hull and propeller maintenance, repair and retrofit activities. »The balance between shipowners and developers at the conference allows for an open exchange where both sides benefit,« adds Volker Bertram, Senior Project Manager, Competence, Learning & Academy at DNV GL – Maritime. Six months after being published, shipowners, service suppliers and technical experts from DNV GL will have the opportunity to share their experiences with the HullPic was launched last year in Italy Photo: DNV GL THE NEW PCP CONTROLLABLE Operated by water hydraulic to save the environment and your budget! REGISTER NOW! AND EXPLORE MORE AT: HTTPS://VIMEO.COM/186394313 70 HANSA International Maritime Journal – 154. Jahrgang – 2017 – Nr. 3

Schiffstechnik | Ship Technology new ISO standard and discuss potential challenges that may have encountered. The new standard aims to improve the accuracy and transparency of supporting data underpinning statistics, which form the basis for fuel and CO2 savings predictions. However, experts state that despite overall improvements, the standard poses several challenges: According to Beom Jin PARK, Senior Research Engineer at the Korea Research Institute of Ships and Ocean Engineering (KRISO), the ISO 19030 methods are not so easy to implement for ship operators. »The accuracy of measurements is lower than considered in ISO 19030. And even with built-in filters and long time span of evaluation and reference periods, continuous analysis of performance does not show much consistency«, Kriso and his colleagues write in their HullPIC paper. The challenge of correcting for changing operational and ambient conditions in hull performance predictions will be picked up by Daniel Schmode (DNV GL) and Andreas Krapp (Jotun). Usually, baselines refer to the ship in calm water, typically for design condition and sea-trial condition. But most ships operate in off-design conditions in actual service. Speed-power curves depend on the loading condition (draft and trim). Popular schemes interpolating from baseline curves are unable to reflect the complex nonlinearities of hull resistance at intermediate drafts and varying trim. Instead, using loading condition specific speed-power curves is recommended. »So your ship is not operating effciently (due to biofouling) – now what?« This was shown for container ships last year. Krapp and Schmode have extended their study to a variety of cargo ships, showing CFD-based interpolation to be clearly superior. The findings are not only of interest for hull and propeller performance, but impact also speed-trial analysis procedures and EEDI calculations. Elizabeth Haslbeck and Erik Holm from the US Navy will pose the following question in their title: »So your ship is not operating effciently (due to biofouling) – now what?« The most common and obvious solutions are likely to change the coating, the cleaning procedures, or both. But coating, cleaning strategy and operational profile are closely linked and cannot be considered separately. Haslbeck and Holm will outline the most important factors to consider. How performance monitoring ties in with the European Union’s Regulation for Monitoring, Reporting and Verification is something that Torsten Büssow and Jarle Blomhoff from DNV GL will pick up. Initially, performance monitoring was intended to guide the industry towards better business practice, specifically more energy effcient ship operation. However, once proper systems and procedures are in place, performance monitoring may also solve some of the challenges of the upcoming EU MRV regulation and the IMO DCS (Data Collection System) requirements. ED STAR-CCM+: Discover better designs, faster. Raum für Innovationen - simulieren Sie maßstabsgetreu unter realen Betriebsbedingungen siemens.com/mdx HANSA International Maritime Journal – 154. Jahrgang – 2017 – Nr. 3 71

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