In November 2020 IMO’s Marine Environment Protection Committee (MEPC) 75 approved draft amendments to the Convention for the Control of Harmful Anti-fouling Systems on Ships (AFS Convention), to include controls on the biocide cybutryne. These amendments are expected to adopted in June this year at MEPC 76.
The ruling to prohibit anti-fouling systems containing cybutryne (also known under its industry name Irgarol-1051) would apply to ships from 1 January 2023 or, for ships already bearing such an anti-fouling system, at the next scheduled renewal of the anti-fouling system after 1 January 2023, but no later than 60 months following the last application to the ship of such an anti-fouling system. The AFS Convention already prohibits the use of biocides using organotin compounds.
Stein Kjølberg, Global Category Director, Hull Performance, Jotun commented: “The ban of cybutryne is a non-issue for Jotun, as it’s not been used in any of our antifouling coatings for more than 20 years. Although cybutryne was among potential candidates to replace tributyltin (TBT) – when that too was banned by the IMO, back in 2001 – we realised its low degradation rate in seawater might lead to the same issue of environmental persistence. MEPC 75 also approved two new quantitative measures to reduce carbon dioxide emissions per ton-mile of cargo transported: Energy Efficiency Existing Ship Index (EEXI) and Carbon Intensity Indicator (CII).
EEXI sets a baseline reference and may require a vessel to retrofit energy saving devices, or impose an engine power limit, while CII will be used to track and rate the vessel’s energy efficiency in actual operation, on a yearly basis. Vessels with favourable ratings will unlock advantages in operational profitability, charter attractiveness and financing options.
“This is where developments in high quality antifoulings can make all the difference,”
asserts Kjølberg. He adds: “Energy efficiency and carbon emissions are inextricably linked to fouling growth on ships’ hulls. Algae and barnacles add significant frictional resistance, and this results in speed loss. To compensate for that, and keep up with sailing schedules, vessels are forced to increase power. As a result, fuel consumption and carbon emissions also increase. That creates obvious financial
ramifications, environmental impact, and difficulties in terms of regulatory compliance. So, in short, a dirty hull is bad news for everyone. Keeping clean
is unquestionably the way forward. ” Last year Jotun launched Hull Skating Solutions (HSS). This new package involves proactive cleaning that is designed to maintain an “always clean” hull, removing bacteria and biofilm before macro-fouling can take hold. In doing so it optimises performance while diminishing the need for reactive cleaning.
HSS features the ‘always-onboard’
Jotun HullSkater, described as “the industry’s first robotic technology purposely designed for proactive cleaning”. The unit is remotely controlled via a 4G connection by expert Jotun Skate operators, who inspect and clean, when required, a specially developed SeaQuantum Skate antifouling. A proprietary algorithm, big data and condition monitoring (tailored to each individual vessel) are utilised to help set optimal inspection and proactive cleaning schedules.
Hempel’s reformulated antifoulings Global coatings manufacturer Hempel says it has enhanced its “established and proven” Olympic+ and Oceanic+ antifouling range and has launched five additional antifouling solutions: Oceanic Protect+, Oceanic Flex+, Olympic Protect+, Olympic Flex+ and Olympic Protect.
The company says that its Olympic+ and Oceanic+ antifouling coatings have been in use since 2009 and 2012 r espectively and “the introduction of the new, re-formulated products delivers an even higher performance through better control of the leached layer and an enhanced mechanical strength”.
In a statement it says: “Coupled with this, higher volume solids, high dry film thickness per coat and lower volatile organic compounds reduce costs, time and emissions during application. These new antifouling solutions are designed to suit different trading patterns, and this ensures the best possible fouling protection in all trading conditions.”
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