Method and apparatus for exchanging ballast water in a ship

B - Operations – Transporting – 63 – B

Patent

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Details

B63B 13/00 (2006.01) B63B 57/00 (2006.01)

Patent

CA 2356889

A system for automatically replacing ballast water in a ballast tank (6) of a ship (5) comprises a water inlet port (11) on a part of the ship where the water pressure acting on the ship when in forward motion in the water is higher than the pressure of the ballast water being replaced, a water discharge outlet (14) in the ballast tank and a water inlet passage (12) extending between the water inlet port (11) and the ballast tank (6) for introducing water into the ballast tank at a higher pressure than the ballast water in the tank. In this way the ballast water is forced from the ballast tank through the discharge outlet (14) to be replaced by water introduced through the inlet port (11). A method for replacing ballast water in the ballast tank of a ship is also provided.

L'invention se rapporte à un système permettant de remplacer automatiquement l'eau de lestage dans une citerne de ballast (6) de navire (5) . Ce système possède un orifice d'entrée (11) de l'eau, situé sur une partie du navire où la pression de l'eau qui s'exerce sur le navire lorsque celui-ci se déplace vers l'avant sur l'eau, est supérieure à la pression de l'eau de lestage à remplacer, un orifice de sortie (14) de l'eau ménagé dans la citerne de ballast et un passage d'admission de l'eau (12) qui est disposé entre l'orifice d'entrée (11) de l'eau et la citerne de ballast (6) et permet l'introduction de l'eau dans la citerne de ballast à une pression supérieure à celle de l'eau de lestage dans la citerne. De cette manière, l'eau de lestage est expulsée hors de la citerne de ballast par l'orifice d'évacuation (14) de façon à permettre l'introduction d'eau de remplacement par l'orifice d'entrée (11). L'invention se rapporte à un procédé de remplacement de l'eau de lestage dans la citerne de ballast d'un navire.

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