Ships – Building – Freighters
Patent
1980-03-28
1983-10-18
Basinger, Sherman D.
Ships
Building
Freighters
114125, 220 85B, B63B 2508
Patent
active
044099193
ABSTRACT:
A system whereby use is made of a double bottom tank, in fluid communication with a bag made of reinforced elastomeric material to provide segregated ballast space in the cargo space of a ship. The double bottom space and bag are filled with ballast water when the cargo space is empty, thereby making use of the cargo space in which the bag is located to carry ballast water in space previously occupied by cargo, without having any cross-contamination of the ballast water by the cargo residues or gases. The outward and upward movement of the bag is restricted by a rigid guide cage. An open, or partially open, topped rigid container is placed around the guide cage to restrict the "free surface effect" of the ballast water in the unlikely event of failure of the ballast bag. A header tank is provided to keep a positive pressure head on the water in the bag when in the ballast condition. A semi-flexible float assists in guiding the bag during ballasting and de-ballasting operations.
REFERENCES:
patent: 2102590 (1937-12-01), Gray et al.
patent: 2891672 (1959-06-01), Veld et al.
patent: 3707937 (1973-01-01), Liles
patent: 4030438 (1977-06-01), Telfer
patent: 4117796 (1978-10-01), Strain
patent: 4213545 (1980-07-01), Thompson et al.
patent: 4228754 (1980-10-01), Shibata et al.
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