The effectiveness of rotating brush devices for management of vessel hull fouling

This paper presents the benefits of the more electric vessels powered by hybrid engines and investigates the suitability of a particular prime-mover for a specific ship type using a simulation environment which can approach the actual operating conditions. The performance of a mega yacht (70m), powered by two 4.5MW recuperated gas turbines is examined in different voyage scenarios. The analysis is accomplished for a variety of weather and hull fouling conditions using a marine gas turbine performance software which is constituted by six modules based on analytical methods. In the present study, the marine simulation model is used to predict the fuel consumption and emission levels for various conditions of sea state, ambient and sea temperatures and hull fouling profiles. In addition, using the aforementioned parameters, the variation of engine and propeller efficiency can be estimated. Finally, the software is coupled to a creep life prediction tool, able to calculate the consumption of creep life of the high pressure turbine blading for the predefined missions. The results of the performance analysis show that a mega yacht powered by gas turbines can have comparable fuel consumption with the same vessel powered by high speed Diesel engines in the range of 10MW. In such Integrated Full Electric Propulsion (IFEP) environment the gas turbine provides a comprehensive candidate as a prime mover, mainly due to its compactness being highly valued in such application and its eco-friendly operation. The simulation of different voyage cases shows that cleaning the hull of the vessel, the fuel consumption reduces up to 16%. The benefit of the clean hull becomes even greater when adverse weather condition is considered. Additionally, the specific mega yacht when powered by two 4.2MW Diesel engines has a cruising speed of 15 knots with an average fuel consumption of 10.5 [tonne/day]. The same ship powered by two 4.5MW gas turbines has a cruising speed of 22 knots which means that a journey can be completed 31.8% faster, which reduces impressively the total steaming time. However the gas turbine powered yacht consumes 9 [tonne/day] more fuel. Considering the above, Gas Turbine looks to be the only solution which fulfills the next generation sophisticated high powered ship engine requirements.

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Unsupervised Learning Neural Network for Classification of Ship-Hull Fouling Conditions

The 2006 IEEE International Joint Conference on Neural Network Proceedings ◽

10.1109/ijcnn.2006.247089 ◽

2006 ◽

Author(s):

Pei-Fang Wang ◽

S. Lieberman ◽

Liyen Ho

Keyword(s):

Neural Network ◽

Unsupervised Learning ◽

Ship Hull ◽

Hull Fouling

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Temporal development of hull-fouling assemblages associated with an Antarctic supply vessel

Marine Ecology Progress Series ◽

10.3354/meps08074 ◽

2009 ◽

Vol 386 ◽

pp. 97-105 ◽

Cited By ~ 20

Author(s):

JE Lee ◽

SL Chown

Keyword(s):

Temporal Development ◽

Hull Fouling ◽

Fouling Assemblages

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Distribution and status of marine invasive species in and bordering the West Coast National Park

Koedoe ◽

10.4102/koedoe.v47i1.73 ◽

2004 ◽

Vol 47 (1) ◽

Cited By ~ 12

Author(s):

T.B. Robinson ◽

C.L. Griffiths ◽

N. Kruger

Keyword(s):

Invasive Species ◽

National Park ◽

World Wide ◽

Global Scale ◽

The West ◽

Hull Fouling ◽

Marine Invasions ◽

Marine Invasive Species ◽

Ballast Tanks ◽

Being Moved

On a global scale, species are constantly being moved from their areas of origin to new locales. Such range extensions can occur naturally, but are frequently aided (intentionally or non-intentionally) by humans (Mack et al. 2000). As a result, the marked world-wide increase in animal, plant, and microbial immigrations, has been found to roughly track the increase in human commerce (Mack et al. 2000). The principal vectors of human-mediated marine invasions are ballast water (Williams et al. 1988), mariculture (Minchin 1996), sediment held in ballast tanks (Carlton 1985), and ship hull fouling (Minchin 1996).

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Unsupervised Learning Neural Network for Classification of Ship-Hull Fouling Conditions

The 2006 IEEE International Joint Conference on Neural Network Proceedings ◽

10.1109/ijcnn.2006.1716738 ◽

2006 ◽

Author(s):

Pei-Fang Wang ◽

S. Lieberman ◽

Liyen Ho

Keyword(s):

Neural Network ◽

Unsupervised Learning ◽

Ship Hull ◽

Hull Fouling

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Relative importance of vessel hull fouling and ballast water as transport vectors of nonindigenous species to the Canadian Arctic

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2014-0473 ◽

2015 ◽

Vol 72 (8) ◽

pp. 1230-1242 ◽

Cited By ~ 31

Author(s):

Farrah T. Chan ◽

Hugh J. MacIsaac ◽

Sarah A. Bailey

Keyword(s):

High Risk ◽

Water Samples ◽

Ballast Water ◽

Canadian Arctic ◽

Nonindigenous Species ◽

The Arctic ◽

Relative Importance ◽

Total Abundance ◽

Hull Fouling ◽

Water Based

Ships’ hull fouling and ballast water are leading vectors of marine nonindigenous species globally, yet few studies have examined their magnitude in the Arctic. To determine the relative importance of these vectors in Canada’s Arctic, we collected hull and ballast water samples from 13 and 32 vessels, respectively, at Churchill, Manitoba. We compared total abundance and richness of invertebrates transported on hulls versus those in ballast water. We found that hull fouling was associated with higher total abundance and richness of nonindigenous species when compared with ballast water. Additionally, a significant positive richness–total abundance relationship for nonindigenous species for hull fouling but not for ballast water assemblages suggests that the likelihood of a high-risk (i.e., species-rich and high abundance) introduction event is greater for the former than the latter vector. The discovery of viable, widespread nonindigenous barnacles in hull samples further underscores the prominence of hull fouling over ballast water as a vector of nonindigenous species. Our study demonstrates that hull fouling is a more important vector for transfer of nonindigenous species to the Canadian Arctic than ballast water based on abundance and richness of nonindigenous species transported by the two vectors.

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