Patent ID: 6374761
Filing Date: 2002-04-23
Classification: B63B,F17C,Y10S

Abstract:
Watertight and thermally insulating tank built into a bearing structure of a ship, said tank comprising two successive watertightness barriers, one being a primary watertightness barrier in contact with the product contained in the tank and the other being a secondary watertightness barrier placed between the primary barrier and the bearing structure, at least one thermally insulating-barrier being provided between the bearing structure and the secondary watertightness barrier or between the two watertightness barriers, each at least one thermally insulating-barrier comprising a number of caissons of roughly parallelepipedal overall shape, each caisson comprising a bottom panel and a top panel made of plywood, wherein the panels of each caisson are spaced apart by a number of spacer pieces comprising thin sheets of plywood, extending at right angles to said panels, each caisson being at least partially filled with blocks of foam bonded over a substantial part of the height of each spacer piece, to prevent the spacer pieces from buckling under load.