• Journal of the Korean Society of Marine Environment & Safety
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• v.28 no.6
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• pp.1100-1109
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• 2022

Herein, a case study was conducted on the bilge pumping performance of a 24,000TEU class container ship with an overall length of 400m. Although the bilge system of the 24,000TEU class container ship was designed in accordance with the rule requirements of the Classification Society, the bilge system did not satisfy the 2 m/s requirements of SOLAS Reg.II-1/35-1 under the rated flow rate and maximum flow rate conditions of the bilge pump installed in the ship. In particular, assumptions were made that No.1 ~ No.4 cargo holds were flooded and filled entirely by sea water and the evaluation of bilge pumping performance had been performed for No.1 ~ No.4 cargo holds. According to the evaulation results of the, the mean water velocity at the main bilge pipe for No.2, No.3, and No.4 cargo holds did not meet the 2 m/s criterion. To resolve this problem, in this study, the branch bilge pipe in each cargo hold was changed from 150A to 200A and the mean water velocity at the main bilge pipe for No.2, No.3, and No.4 was calculated as 2.479m/s, 2.476m/s, and 2.459m/s, respectively.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.10
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• pp.1835-1841
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• 2006

Demand of enhanced bilge separation sensor system has been recently increased due to the severe regulation reinforcement of MEPC(Marine Environment Production Committee). Up to date bilge separation sensor has to be extremely accurate and highly reliable. To design and build such a bilge separator. a precise oily water separation level sensor that distinguishes oil from water is critical. Three dimensional simulations have been carried out to figure out the characteristics of capacitive level sensors, which grounds the finding of the parameters required to design the sensors. The parasitic capacitance problem which is inherent to capacitive level sensors has been taken care of. This paper concludes with the future research direction that can be pursued with the newly defined parameters of the capacitive level sensors.

• Proceedings of KOSOMES biannual meeting
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• 2006.11a
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• pp.221-237
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• 2006

Domestic laws such as Korea Marine Pollution Prevention Law which has been made and amended according to the conclusions and amendments of various international conventions, especially by MARPOL 73/78, were reviewed and compared with major contents of international conventions, and several alternative measures for legislating new laws or amending existing laws such as Korea Marine Pollution Prevention Law in accordance with new contents and recent amendments of existing and new international conventions were proposed. Annex VI of MARPOL 73/78 has been recently accepted in Korea Marine Pollution Prevention Law which should be applied to ships which are the moving point sources of air pollution at Sea rather than in Korea Air Environment Conservation Law which should be applied to automobiles and industrial installations which are the line and/or point sources of air pollution in land. International Convention for Ship's Ballast Water/Sediment Management should be accepted in Korea Marine Pollution Prevention Law or by a new law in order to prevent domes marine ecosystem and costal environment from the invasion of harmful exotic species through the discharge of ship's ballast water. International Convention for the Control of Harmful Anti-Fouling Systems on the Ships should be accepted in Korea Marine Pollution Prevention Law which should be applied to ships which are navigating in open sea and coastal waters rather than in Korea Noxious Chemicals Management Law. Basel Convention which shall regulate and prohibit inter-nations movements of noxious chemical substances should be accepted in Korea Marine Pollution Prevention Law in order to prevent the movement and transfer of scrap-purpose tanker ships containing bilge water of oil/water mixtures and chemicals remained on board from advanced countries to developing and/or underdeveloped countries and to conserve global marine environment after all.

• Journal of Navigation and Port Research
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• v.41 no.6
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• pp.365-372
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• 2017

The rolling motion of a floating body makes crews and passengers exhausted and/or applies forces to the structure to cause damage; it might even upset the body. Therefore, almost all ships are equipped with bilge keels for anti-rolling; in special cases, an anti-rolling tank(ART) or fin stabilizer or gyroscope could be installed. But an ART requires a large capacity to install it, and a fin stabilizer and gyroscope need great costs to install and also many expenses to operate. The authors suggest the use of an anti-rolling pendulum(ARP), and they showed that the ARP is effective to reduce rolling by experiments and via a Runge-Kutta analysis. This paper introduces the linearized 2 degrees of freedom with a viscous damping system for a ship equipped with ARP; it also shows the validation of the linearized analysis for the ship's roll motion. The paper proposes an optimum ARP on the basis of the justified model. The case of the 7.7kg model with ship 20g ARP of a mass ratio of 0.26%, is the most effective for reducing roll motion. The paper shows the ARPs with various mass ratios are effective for reducing the roll motion of a ship by free decaying roll experiments.