Study on alternative approaches to corrosion protection of ballast tanks using an economic model |
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| Institution: | 1. Antwerp Maritime Academy, Noordkasteel Oost 6, B-2030 Antwerp, Belgium;2. University of Liege, ANAST, Naval Architecture, Institut du Genie Civil, Bat. B52/3, Chemin des Chevreuils 1, 4000 Liege 1, Belgium;3. Dept. Bioscience Engineering, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium;4. Centre for Environmental Sciences, Hasselt University, Agoralaan, 3590 Diepenbeek, Belgium;1. Department of Optical-Electronic Devices and Systems, ITMO University, 197101, Saint Petersburg, Kronverksky 49, Russia;2. Aerospace Non-Destructive Testing Laboratory, Faculty of Aerospace Engineering, Delft University of Technology, Postbus 5058, 2600 GB Delft, The Netherlands;1. Corrosion and Protection Centre, School of Materials, The University of Manchester, The Mill, Sackville St, Manchester M13 9PL, UK;2. AkzoNobel Chemicals bv, Supply Chain, Research & Development, P.O. Box 10, 7400 AA Deventer, Netherlands;3. AkzoNobel, Supply Chain, Research & Development, Stoneygate Lane, Felling, Gateshead, Tyne & Wear NE10 0JY, UK;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China;2. Department of Chemistry, School of Civil Engineering, LFTS, Lovely Professional University, Phagwara 144402, Punjab, India;3. School of Material Science and Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China;4. CNPC Key Lab for Tubular Goods Engineering, Southwest Petroleum University, Chengdu 610500, Sichuan, China;5. Department of Chemistry, School of Mathematical & Physical Sciences, North-West University, Mafikeng Campus, Private Bag X2046, Mmabatho 2735, South Africa;1. Muehlhan AG, Schlinckstraße 3, 21107 Hamburg, Germany;2. Fraunhofer Institute for Manufacturing Technology and Advanced Materials Research (IFAM), Wiener Straße 12, D-28359 Bremen, Germany |
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| Abstract: | One of the most relevant problems in ship construction and maintenance nowadays is corrosion in ballast tanks of modern merchant vessels. On the one hand, there is a general consensus that the economic lifespan of such a vessel depends, to a large degree, upon the corrosion state of its ballast tanks, while on the other hand these ballast tanks, located between the outer hull and the cargo tanks, makes routine inspection and maintenance a difficult task.Today, ship's ballast tanks are usually constructed in steel and protected with an epoxy coating backed up by sacrificial zinc anodes. Such a construction has been applied without significant alterations for many years. The objective of this economic study is to compare this construction method with some potential alternatives. The considered alternatives are: (1) an increase in structural scantlings, eliminating the necessity to replace corroded at a cost of real cargo carrying capacity of the ship, (2) application of the novel and more durable TSCF25 coating (3), the use of corrosion resistant steel in ship construction and (4) a standard PSPC15 coating combined with lifetime lasting aluminum sacrificial anodes. A cost model was used to evaluate these alternative options together with sensitivity analysis. It is concluded that the durable coating and the use of lifetime lasting aluminum anodes are bound to improve the actual basic tank concept. Corrosion resistant steel becomes attractive when the steel price becomes competitive. |
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