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Exactly how foul is the fouling problem?


MARIN grapples with slime to


discover its impact on ship performance H


Since the ban on tributyltin (TBT) anti-fouling paints from 2003, the effect of fouling on ship performance has again become an issue. TBT


anti-fouling was undoubtedly effective, but at the same time it was not kind to the environment.


Klaas Kooiker & Maarten Flikkema k.kooiker@marin.nl


igh fuel prices and economically challenging times mean that there is an increasing need to reduce fuel


consumption and one effective way of re- ducing consumption is to lessen the impact of fouling. Report investigates MARIN’s ac- tivities in this field.


Severe fouling by green algae and barnacles on ship hull and propeller tunnel 18 report


Marine growth has many different forms, the most visible being green weeds and barnacles and it is not hard to imagine their detrimental effect on the resistance of a ship. A much less visible fouling is slime produced by bacteria which settle on the hull within hours after exposure to water. It is easily washed off, but strangely enough it can withstand the flow of water along a ship, even if the ship is coated with so- called foul release coating. Slime remains and it can have a large negative effect on resistance. In the past MARIN has found resistance increases up to 8% during tests. Research on fouling is very complex because marine growth depends on a large amount of variables, such as water temperature, sunlight and operational profile. For instance, a ship operating in the Arctic is hardly affected by fouling, while in the tropics fouling on the hull is noticeable within weeks. Ships that spend a lot of time in ports are particularly vulnerable to fouling. Due to the importance of fouling on fuel consumption and emissions, MARIN has several research projects underway, each with their own focus.


Courtesy TNO


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