• Title/Summary/Keyword: Anti-Fouling system

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A study for Domestic Respond to the 'AFS' Convention of IMO (IMO-AFS 협약 채택에 따른 국내 대처방안 연구)

  • 설동일;김인수;이국진;박성진;박상호;김동근
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2002.11a
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    • pp.39-44
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    • 2002
  • Bans on TBT based antifouling paints have been drafted since 1999 by meetings 42, 43, 45 and 46 for the MEPC (Marine Environmental Protection Committee) of the International Marine Organization, and decided finally at a Diplomatic Conference of the IMO in October 2001. It was a key issue that there should be a global prohibition on the application of organo-tin compounds as biocides in Anti-fouling systems by Jan. 2003, and a complete prohibition on te presence of organo-tin compounds on ships by 1 Jan. 2008. This paper suggests a method to design International Anfi-fouling system cretificate, Record of anti-fouling system, Endorsement of the Records, Declaration on Anti-fouling System, Port State Control and reform(legislative) associated a law.

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Design of the Electronic Anti-Fouling System for a Wave Energy Converter

  • Lee, Ji-Young;Oh, Jin-Seok
    • Journal of Navigation and Port Research
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    • v.33 no.7
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    • pp.501-504
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    • 2009
  • There are many difficulties to supply constant power to marine facilities which operate in the sea. Especially, there is a limit to stand alone power supply systems due to the influence of weather conditions. That's why a hybrid power supply system is required to overcome these problems. This paper will describe an Electronic Anti-Fouling System (EAFS) to maximise the power efficiency for a solar - wave hybrid power generation system. A main factor reducing the efficiency of a Wave Energy Converter (WEC) is due to the attachment of aquatic life forms. Therefore the aim of this research is to develop a simulation programme to enable the design of more efficient EAFS for hybrid power generation systems and to provide valuable data for production of more efficient EAFS.

Magnetic Field Gradient Optimization for Electronic Anti-Fouling Effect in Heat Exchanger

  • Han, Yong;Wang, Shu-Tao
    • Journal of Electrical Engineering and Technology
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    • v.9 no.6
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    • pp.1921-1927
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    • 2014
  • A new method for optimizing the magnetic field gradient in the exciting coil of electronic anti-fouling (EAF) system is presented based on changing exciting coil size. In the proposed method, two optimization expressions are deduced based on biot-savart law. The optimization expressions, which can describe the distribution of the magnetic field gradient in the coil, are the function of coil radius and coil length. These optimization expressions can be used to obtain an accurate coil size if the magnetic field gradient on a certain point on the coil's axis of symmetry is needed to be the maximum value. Comparing with the experimental results and the computation results using Finite Element Method simulation to the magnetic field gradient on the coil's axis of symmetry, the computation results obtained by the optimization expression in this article can fit the experimental results and the Finite Element Method results very well. This new method can optimize the EAF system's anti-fouling performance based on improving the magnetic field gradient distribution in the exciting coil.

A study for Domestic Respond to the ′AFS′ Convention of IMO (IMO-AFS 협약 채택에 따른 국내 대처방안 연구)

  • Seol, Dong-Il;Kim, In-Soo;Lee, Guk-Jin;Park, Sang-Jin;Park, Sang-Ho;Kim, Dong-Geun
    • Journal of Navigation and Port Research
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    • v.26 no.5
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    • pp.505-510
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    • 2002
  • Bans on TBT based antifouling paints have been drafted since 1998 by meetings 42, 43, 45 and 46 for the MEPC (Marine Environmental Protection Committee) of the International Marine Organization, and decided finally at a Diplomatic Conference of IMO in October 2001. It was a key issue that there should be a global prohibition on the application of organo-tin compounds as biocides in Anti-fouling systems by Jan. 2003, and a complete prohibition on the presence of organo-tin compounds on ships by 1 Jan. 2008. This paper suggests a method to design International Anti-fouling system cretificate, Record of anti-fouling system, Endorsement of the Records, Declaration on Anti-fouling System, Port State Control and reform(legislative) associated a law.

Antifouling Effect of an Ultrasonic System Operating at Different Frequencies (주파수 변동에 따른 초음파방오장비의 파울링제거효과)

  • Bae, Jin-Woo;Park, Guan-Sik;Ru, Myung-Lok;Park, Goun-Ha
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.25 no.5
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    • pp.609-616
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    • 2019
  • When the fouling of a vessel occurs, its resistance at sea increases and there is a corresponding increase in fuel consumption. The maintenance cost of the vessel also increases because it is time-consuming to remove the fouling. To solve this problem and minimize environmental contamination of sea-water, there have been recent developments in anti-fouling paints as self-polishing copolymers that not include toxic elements such as tin. When these conventional techniques are applied to vessels, polishing is promoted during the operation whereby friction or vibration with seawater occurs. This leads to enhanced anti-fouling performance. However, when fouling is intensified such as during an anchorage, there is no flow of seawater and polishing is suppressed. This leads to a deterioration of the performance of anti-fouling. To solve these problems, we developed a system that induces vibration in a vessel during anchorage. As such, the deterioration of polishing due to insuf icient flow of seawater is inhibited. The reliability of the ultrasonic antifouling system was evaluated by calculating its repeatability. The removal efficiency of fouling of the proposed system was qualitatively evaluated using test specimens. The test revealed that the value of the coefficient of variation for the reproducibility of the frequency and amplitude was 0.2 % and 4.0 % on average. The degree of fouling of the specimens was the highest at 73.3 g in the No.5 sepcimen. Moreover, efficiency of fouling removal was 93.2 % on average compared to the specimens without the proposed system.

Effect of Annealing Heat Treatment to Corrosion Resistance of a Copper (구리의 내식성에 미치는 어닐링 열처리의 영향)

  • Kim Jin-Kyung;Moon Kyung-Man;Lee Jin-Kyu
    • Journal of Advanced Marine Engineering and Technology
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    • v.29 no.6
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    • pp.654-661
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    • 2005
  • Copper is a well known alloying element that is used to improve the resistance to general corrosion of stainless steel And also Cu cation have the anti-fouling effect to inhibit adhesion of the marine algae and shellfish to the surface of heat exchanger cooling pipe or outside wall of the ship, Therefore there are some anti-fouling methods such as anti-fouling Paint mixed with copper oxide or MGPS(Marine Growth Preventing System) by using Cu cation dissolved to the sea wather solution. Cu cation can be dissolved spontaneously by galvanic current due to Potential difference between Cu and cooling pipe of heat exchanger with Ti material, which may be one of the anti-fouling designs. In this study the effect of annealing heat treatment to galvanic current and Polarization behavior was investigated with a electrochemical points of view such as measurement of corrosion Potential, anodic polarization curve. cyclic voltammetric curve, galvanic current etc The grain size of the surface in annealed at $700^{\circ}C$ was the smallest than that of other annealing temperatures. and also the corrosion Potential showed more positive potential than other annealing temperatures. The galvanic current between Ti and Cu with annealed at $700^{\circ}C$ was the largest value in the case of static condition. However its value in the case of flow condition was the smallest than the other temperatures. Therefore in order to increase anti-fouling effect by Cu cation, the optimum annealing temperature in static condition of sea water is $700^{\circ}C$, however non- heat treated specimen in the case of flow condition may be desirable.

Study of an analytical method for determining organotin compounds in anti-fouling paints (방오페인트에 함유된 유기주석물질 분석방법 연구)

  • Kim, C.S.;Lee, S.E.;Yoon, J.Y.;Park, I.N.;Kim, M.J.;Kim, I.K.;Oh, H.J.
    • Proceedings of KOSOMES biannual meeting
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    • 2007.11a
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    • pp.35-41
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    • 2007
  • An International Convention on the control of harmful anti-fouling system on ships(AFS Convention) was adopted on 5 October 2001 at Diplomatic Conference in London, and is expected to be presently effectuated with ratification of more than 25-member nations possessing about 25% of total world tonnage. This convention regulates the operation of harmful anti-fouling system and especially prohibits the use of organotin compounds contained in anti-fouling paint. Organotin compounds have a tendency to be easily extracted by specific solvents and have high polarity and low volatility as specific characteristics. This drives us to attempt of going through the process named derivatization that is required in analysis using a gas chromatography(GC). This study was conducted to determine the proper pre-treatment method, ethylation in comparison with hydridization on the analysis of tributyltin in organotin compounds and to verify the application of the method through the experimental analysis practically used anti-fouling paint and painted layer sample of the served ship.

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Evaluation on the Rlationship between Wear Ratio and Polarization Characteristics of Anti-Fouling Paint (방오도료 도막의 마모율과 분극특성의 상관관계에 관한 평가)

  • Jeong, Jae-Hun;Moon, Kyung-Man;Won, Jong-Pil;Park, Dong-Hyun;Kim, Yun-Hae;Kim, Hyun-Myung;Lee, Myeong-Hoon;Baek, Tae-Sil
    • Corrosion Science and Technology
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    • v.13 no.1
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    • pp.15-19
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    • 2014
  • Recently, anti-fouling paints which does not include the poison components such as tin(Sn), copper(Cu) have been increasingly developed in order to inhibit the environmental contamination of the sea water. Moreover, the wear ratios of these anti-fouling paints are very important problem to prolong their life time in economical point of view. In this study, five types of anti-fouling paints as self polishing type were investigated on the relationship between their polarization characteristics and wear ratios. It was verified that there was apparently a good relationship between the wear ratio and polarization characteristics, for example, the wear ratio increased with increasing the impedance ratio, and increased or decreased with the corrosion potential shifting in the negative or positive direction respectively. In addition, the wear ratio decreased with decreasing the corrosion current density. Consequently, it is suggested that we can qualitatively expect the wear ratio by only measuring the polarization characteristics. Therefore, before the examination of the wear ratio was actually carried out in the field, the evaluation of polarization property in the laboratory may give a available reference data for their developments.

Anti-Fouling System for Oscillating Water Column in Buoy (진동 수주형 브이의 Anti Fouling system)

  • Oh, Jin-Seok;Jo, Kwan-Jun
    • Journal of Navigation and Port Research
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    • v.34 no.6
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    • pp.441-445
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    • 2010
  • The ouput power of wave energy system in buoy is determined according to the inner diameter of oscillating water column and flow resistance. The increase of adhered shellfish inside the water column leads to decrease the inner diameter of wave energy converter. Influx loss of seawater reduces the efficiency of output power in the wave generation system. In this paper, the test result of AFS characteristic is described for preventing the deposition with shellfish and etc. The current of anode is controlled by buck converter, and the control algorithm developed for AFS in buoy. The experimental results is shown excellent preventing capapbility of AFS in buoy.

A Study of Multi-channel AFS for Marine Traffic Facilities (해양교통시설물용 다채널 AFS에 관한 연구)

  • Kim, Ji-Yoon;Lee, Ji-Young;Oh, Jin-Seok
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.1
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    • pp.75-80
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    • 2015
  • After some period of time, the marine traffic facilities find problems caused by shellfish adhered to inside and inlet of the water column. Therefore, single-channel AFS(Anti-Fouling System) has been applied in order to minimize the deposition of shellfish. However, imbalance phenomenon of ionization of copper electrodes that are used for single-channel AFS appeared. This problem resulted in frequent replacement of anode. In this paper, multi-channel current control system has been developed, as well as the related hardware has been designed and fabricated. Further, experimental study has been undertaken to compare the application of single and multi- channel AFS. Through the sea experiments, it was possible to confirm that the copper electrode used for multi-channel AFS is uniformly ionized.