coatings
Staten Island Ferries’ John Noble was coated with Ecospeed to improve hull performance
system, vessels that typically use US$90,000 of bunker fuel per day for example, can save at least 2 per cent of fuel per day. The latest foul release system from Nippon
Paint is LF-Sea, which, according to the supplier,
provides a real friction reduction
effect that manifests itself in terms of fuel or power savings. Ferries were the first major ship type to adopt LF-Sea. Fixed sea routes provided almost instant proof that the product was helping fuel consumption, and fuel savings in the range of 3 to 7 per cent have been recorded. An alternative biocide-free hull coating
is Ecospeed from Subsea Industries. This relies on the ‘non-stick’ properties of a hard glass-flake vinyl ester system, which can be easily polished in water to maintain a low average hull roughness and lead to fuel efficiency. Recently the underwater hull of John Noble, one of the ferries owned by Staten Island Ferries, was coated with Ecospeed in Bridgeport, Connecticut, USA.
Under normal operation, ferries have to drydock once a year to comply with classification regulations. During the busy tourist season these ferries need to be sailing to make money so the best time for drydocking is the off season when there are fewer
84 I Passenger Ship Technology I Spring 2012
passengers. For this reason the majority of these ferries come into drydock for a short time during the winter months. The owner is then presented with bad weather conditions in which to perform repair work to the paint system, and often therefore the high quality paint job needed for other hull coatings cannot be assured. The use of Ecospeed on the hulls, however, offers the opportunity to optimise the fuel efficiency in between dockings. Ferries sail on a fixed route, so the ports they visit and the turnaround time is known in advance which makes it possible to implement a stricter underwater treatment programme. The third generation pure silicone-based
foul release system from Sigma Coatings (PPG), Sigmaglide 990, offers guaranteed fuel savings of 5 per cent, subject to average speed and operational activity of the vessel.
Sigmaglide 990 was applied to Pullmantur cruise
ship, Pacific Dream. A recent inspection showed excellent performance despite the vessel lying idle in Genoa for two months during the summer. According to Pullmantur’s fleet manager, “The silicone paint fuel consumption saving has an average impact of 3–4 per cent in our fleet, with vessels sailing at average speeds of 15 knots and
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