Ships – Building – Freighters
Patent
1983-03-18
1984-10-23
Blix, Trygve M.
Ships
Building
Freighters
B63B 2512
Patent
active
044781652
ABSTRACT:
A plurality of narrow ballast tanks arranged around the periphery of diaphragms. The peripheral ballast tanks facilitate the construction, installation, operation, and maintenance of the diaphragms that segregate the cargo oil from the ballast water in the oil tanker in which they are fitted. The peripheral ballast tanks in general are built along the longitudinal and transverse bulkheads and ship's sides, but they can also be arranged to sub-divide the lower portion of large cargo tanks, they, in effect, form a tank grid about the lower portion of the cargo tanks' space, with the cells in the grid being suitable for the reception of the diaphragms. The diaphragms each consist of three main parts: a vertically movable thin and flat partition, that can be buoyant in order that it may float on ballast water; a mating but fixed partition rim fitted outside of the movable partition; and elastomeric membrane sheet that is fitted between and attached to the movable partition in such a manner that the complete diaphragm forms an impervious barrier to oil or water attempting to pass from top to bottom or vice verse. A movable partition guide is also provided. By locating the fixed partition rim at mid-point of the movable partition travel on the sides of the peripheral ballast tanks, major savings of membrane material can be achieved.
REFERENCES:
patent: 2584953 (1952-02-01), Wiggins
patent: 3326167 (1967-06-01), Paoli
patent: 3477401 (1969-11-01), Hayama
patent: 3707937 (1973-01-01), Liles
patent: 4098297 (1978-07-01), Zahid
patent: 4117796 (1978-10-01), Strain
Blix Trygve M.
Drucker William A.
Sotelo Jesus D.
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