Fleet in Service – exploit its potential, control costs: “Shark”-Tech for stressed hulls

By Peter Pospiech at September 23, 2013 05:49
Filed Under: drive systems

Reduction of water resistance reduces fuel consumption

Energy efficient shipping operation means also: Protection coating for hulls. The chemical industry, here particularly the manufacturer of paints and lacquers, but also classification societies, universities, environmental organizations and not to forget also the shipping companies, during the last years focused pretty strong on these factual circumstances. The nature was a role model: the shark and its skin structure. This super-fast hunter has an almost perfect surface structure: if one looks through a microscope its skin looks like imbricated denticle, which are arranged in such a way, that foreign substances, like e.g. barnacles do not have a chance to inhere. Chemical companies, like e.g. Bodo Möller Chemie, Hempels Paint or Wilckens Paint, have now been crowned with success: they developed high-performance protection coatings and sell them with success.  

Fuel-eater algae and barnacle fouling on a hull

Fouling on hulls and propellers can increase the water resistance monthly by 1% and more – with negative results of fuel consumption. Reduction of water resistance by smoothed anti-fouling-coatings or the regular cleaning of hull and propeller ensure fuel savings by appr. 2 – 5%.
Modern anti-fouling-coatings consist out of biocide systems or not active, extremely smooth non-stick systems. Which coatings might be used depends on the operation profile of the ship, e.g. routes, speed, laytime, etc, and also regularities for this particular anti-fouling-coating. To reduce dock-times, the coating can be done during classification renewing. After applying a roughness measure is highly recommended. The roughness of a human hair thickness increases the fuel consumption by around 1%. A coating alternative is the regular cleaning of hull and propeller – but this depends on the availability of docks, divers, cleaning robots as well as port regularities.

Source / Image: GL, PPM News Service


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