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Ballast Water ManagementAn issue of considerable environmental and political interest over the last few years, ballast water management has now developed into more of a "compliance-oriented" arena. Following IMO action that noted a ballast exchange at sea could be conducted safely, the Coast Guard Naval Architecture Division commissioned a study to determine if various sized PANAMAX containerships can safely conduct an at-sea ballast water exchange (BWE). The study showed that both stability and strength are a concern during BWE evolutions but that both are manageable through proper evaluation and timing of the BWE sequence. The results indicate that the three PANAMAX containerships analyzed can safely perform an at-sea BWE with only a small impact on ship operations. However, it may be necessary to develop a specific ballast exchange sequence for the actual cargo and consumables loadout. This could be accomplished with an onboard stability and loading computer during normal cargo operations while the ship is in port. This study was submitted to the IMO's SLF 42 as an information paper.Because of its size, the report has been divided into two pdf-formatted sections - the Main section which contains the results/conclusions and also the Appendices which contains the ship specific information and the analysis output data. (The appendix is 421 Kb and may take 5 to 8 minutes to download.) Since the report's submittal, the U.S. has significantly upgrdaded its ballast water management program including significant regulatory action. For more information, contact the Coast Guard, Environmental Standards Division.
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