coatings
Cruise ships and ferries are investing in antifouling systems to reduce fuel consumption and costs in light of new energy efficiency regulations
by Brian Goldie N
ew regulations aimed at reducing CO2 emissions from ships over 400gt will make
it mandatory for all new vessels to have an
energy efficiency design index (EEDI) and all other ships in service will need to have a ship energy efficiency management plan (SEEMP). Expected to come into force on 1 January 2013, the SEEMPs will have to incorporate best practices for energy-efficient operation including reducing fuel consumption
and consequently reducing the CO2 emissions. One feature of ship operation which has a major impact on fuel consumption is the condition of the hull. Increased frictional resistance caused by hull roughness will require additional power to maintain a vessel’s speed, or if maintaining constant power, will reduce speed and increase voyage time. Either way this will increase the amount of bunkers needed for a voyage. The
impact of antifouling systems on fuel consumption and carbon emissions has long been known. In a recent study sponsored by Marintek, average vessel speed loss was calculated at 5 per cent for the 60 month lifetime of an antifouling paint. If converted to the extra fuel needed to maintain speed, vessels would require about 15 per cent increase in fuel consumption for the given 60 months period.
When setting-up any such SEEMP there must be a
realistic baseline to compare improvements with, and an effective monitoring and evaluation system. The type and condition of the hull system, and the timing of the analysis can affect the predictions. Coatings can be tested as new, after drydocking, or a fixed period before and after drydocking. Major marine paint manufacturers
Seaflow Neo, it is based on a unique polymer which, according to Chugoku, gives an ultra-smooth surface and excellent polishing performance, resulting in long-term antifouling performance. It has excellent friction resistance properties and CMP has calculated that fuel savings of 3–5 per cent can be achieved. According to Jotun, its latest SeaQuantum coating’s ability to reduce fuel consumption has long been recognised by its customers and Jotun now has measurable data for individual vessels to support these assertions. Following an intensive three-year study, Jotun launched Hull Performance Solutions (HPS), which combines the premium antifouling, priority technical service and reliable tools to measure hull performance over time and offer a unique money-back guarantee. According to Geir Bøe, divisional vice president, marine coatings, “HPS represents a genuine game- changer in the marine coatings segment. Jotun is proud to present a reliable and transparent method of measuring, quantifying and reporting the relationship between hull performance and fuel economy. With the confidence in our technology and our ability to measure hull performance, we can now offer an attractive fuel saving guarantee that is valid for the full period between drydockings. By using sensors to capture information from different data points, we have a basis to calculate fuel savings over time.”
Jotun can offer HPS customers a guarantee that SeaQuantum X200 will provide a clean hull and less than 1.5 per cent speed loss or maximum 4.5 per cent increase in fuel consumption over 60 months, compared to the condition of the vessel after drydock. Foul release coatings are non-biocidal systems based primarily on relatively polymers such as silicone elastomers
‘soft’ or
are
highlighting the fuel efficiency enabled by their hull coatings. These include Chugoku Marine Paints (CMP), which introduced its latest tin-free polishing antifouling coating last May. Called
www.passengership.info
fluoropolymers resins, or ‘hard’ products based on different technologies, such as glass-flake vinyl esters. They rely on low surface energy and easily cleaned surfaces for their effectiveness. Hempasil X3 is the latest generation the technology from Hempel
of based on hydrogel technology. Guaranteed fuel savings, lower
CO2 emissions, less time in drydock and more time in the water, are just some of the benefits reportedly offered by this system. With the Hempasil X3
Passenger Ship Technology I Spring 2012 I 83
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