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Year: 2018
COI code: ICOPMAS13_123
Paper Language: English

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Mohammad Reza Hedayati - Assistant professor Scientific-Applied Faculty of Post &Comm. Tehran, Iran
Mehdi Kamyab Roudsari - PhD Research Scaller, Chemical Engineering, Islamic Azad University–Tehran North Branch, Iran
Mohammad Hossein Amiri - MSc student, Islamic Azad University–Tehran North Branch, Iran
Fatemeh Khodadadi - MSc student, Software Engineering, University of Hertfordshire, Hatfield Hertfordshire, UK


This paper is part of a collaborative project between ITMO Co. Iranian Sanat Sadaf Co. and Islamic Azad University (North Branch) to study the impact of hull and propeller fouling on vessel’s fuel consumption and emissions. It is well known that hull fouling, particularly in case of hard or shell fouling , can cause detrimental impact to the ship hydrodynamic performance. However, some cleaning practices may also lead to decreased lifetime of the fouling-control coating. The surface covered by sea adherence is about 80% of totalship hull and all sea adherences have to be cleaned before inspection. Underwater cleaning of the hull and the adhesive coating can therefore be performed in between dry-dockings in order to improve the ship’s efficiency. Furthermore, hull and propeller cleaning require different time to be performed and imply in distinct costs. Thus, there should be an optimalfrequency of maintenance of hull and/or propeller depending on the ship specific fouling condition. The work presented here has consisted in performing several sea trials according to latest standards, in different configurations, in order to isolate the influence of the hull and the propeller underwater cleaning for a crude oil tanker. and seawater environments. The project resulted in a comprehensive list of many hull cleaners that identified. In order to obtain effective and usable information for the PMO and the Department of Environment following objectives are defined: 1. Presentation of potential hull cleaning systems and important hull cleaning technologies 2. Study of constraints for evaluating hull cleaningsystems 3. Survey on current hull cleaning technologies and ones currently in Development Besides preventing direct surveying, marine fouling causes a decrease of ship’s speed and consequently increases the fuel consumption. For recuperation of ship s performance, it is necessary to dry-dock a ship and to clean off the marine growth on ships hull. Thiscleaning is always required before any other repairing/maintenance activities can follow on. Nowadays cleaning is done manually in dry-dock with an employment of different adapted methods like grit blasting or water jet. It has to be noticed that, in itself, it is a very contaminant operation (the resulting dust always contains painting particles), it is harmful for human operators health and it is a very uncomfortable job. The use of the new technical solution allows cleaning a ship from sea adherence without the use of an expensive dry dock. In this case it would be possible to clean a ship much more often, for example, twice a year. Even in the case when it is necessary to make inspection, repair or restoration of a protective coat of a ship in a dry dock, it would be possible to make a ship s hull cleaning out of a dry dock first, which would allow using dry dock more efficiently [1].A vessel s fuel performance usually begins decreasing after six months from dry-dock and continues to decrease rapidly. Underwater marine growth, barnacles, and/or sea grass can cost a ship-owner millions of extra dollars in time and fuel costs each year. To prevent spending additional dollars for fuel, a ship should be cleaned twice a year. A new VLCC tankeruses approximately 96 tons of bunker fuel per day and 610 barrels of fuel per 24-hour period. The cost per day for fuel alone would be approximately $30,000 with anadditional $20,000 for operating expenses per day. On an average 15,000-mile cruise, the VLCC tanker would


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Hedayati, Mohammad Reza; Mehdi Kamyab Roudsari; Mohammad Hossein Amiri & Fatemeh Khodadadi, 2018, ANALYZING THE CURRENT ADVANCES IN HULL CLEANING TECHNOLOGIES, 13th International Conference on Coasts, Ports and Marine Structures, تهران, سازمان بنادر و دريانوردي, the text, wherever referred to or an achievement of this article is mentioned, after mentioning the article, inside the parental, the following specifications are written.
First Time: (Hedayati, Mohammad Reza; Mehdi Kamyab Roudsari; Mohammad Hossein Amiri & Fatemeh Khodadadi, 2018)
Second and more: (Hedayati; Kamyab Roudsari; Amiri & Khodadadi, 2018)
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