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Determination of the ballast water exchange sequence for an LNG carrier using a liquid cargo handling Simulator

-    scenario with many steps, with smali changes in operational parameters. suitable for use in severe weather conditions,

-    scenario with few steps, causing relatively large changes in operational paramctcrs. suitable for use in good weather,

-    emergency scenarios, e.g. failurc of one ballast pump, failure of any valve,

-    most adverse and most dangerous emergency scenarios, where a failure occurs to the most im-portant component of the ballast installation from ship s safety viewpoint,

-    others.

It should be underlined that simulation is in real time (there is an option of time compression), which enables constant preview of each of the above mentioned parameters, which is rarc in pre-sently used Ballast Water Management Plans. Be-sides, it should be mentioned that currently imple-mented plans comprise only one, not necesserily optimal solution for the subseąuent emptying and refilling of tanks in the method herein dcscribed. A possible failure of any element of the ballast installation brings about temporary Solutions, not sup-ported by tips or instructions as such do not exist in plans developed to datę.

Conclusions

The use of a Liquid Cargo Handling Simulator with its ballast module: Ballast control system -Linę and valves in the development of a ballast water exchange plan will:

-    facilitate the process of determining the order in which ballast tanks should be emptied and re-filled,

-    enable the establishment of optimal scąuence of ballast water exchangc.

-    enable preparing emergency scenarios with a failure of any element of the ballast installation,

-    allow to present, in real time, changes in operational parameters of the ship during the empty-ing and refilling of ballast tanks.

The development of such comprehensive analy-sis of the ballast water exchange by the sequential method will significantly facilitate a further analy-sis based on the BWM Plan, conceming the influence of actual weather conditions and alteration of ship's course and/or speed on the ship's safety during that complicated process.

References

1.    http://globallast.imo.org/

2.    http:/Av\v\v.imo.org/Pages/home.asp.\

3.    IMO. Międzynarodowa Konwencja o kontroli i postępowaniu ze statkowymi wodami balastowymi i osadami. 2004 (Konwencja BWM 2004). Wydanie PRS, 2006.

4.    Akiyama A., Uetsuhara F., Sagishima Y.: Ballast Water Exchange Procedures and tlieir Problems. Transactions of the West-Japan Society of Naval Architects, 2000, 100. 41-53, www.sciencedirect.com

5.    Bielański J.: Considerations about the guidelines on safety of ballast water exchange at sea. Hydronav'99 - Mancm cr-ing '99. Joint 13^,h International Conference on Hydrody-namics in Ship Design and 2^lld International Symposium on Slup Manem ering. Gdańsk-Ostróda 1999.

6.    IMO, International Codę of Intact Stability, Edition 2009, London 2008.

7.    http://www.transas.com/products/simulators/

Recenzent:

dr hab. Leszek Smolarek prof AM Akademia Morska w Gdyni

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