Vertical transverse plate floors are provided both where the bottom is transversely and longitudinally framed. Gradual taper in the longitudinal direction, no sudden discontinuities in the structure being tolerated. The increase in height of the inner bottom is always by a In way of the machinery spaces the double bottom depth is also increased to provide appreciable capacities of lubricating oil and fuel oil. Water ballast bottom tanks are commonly provided right forward and aft for trimming purposes and if necessary the depth of the double bottom may be increased in these regions. It may be deeper to give the required capacities of oil fuel, fresh water, and water ballast to be carried in the bottom. The minimum depth of the double bottom in a ship will depend on theĬlassification society’s requirement for the depth of centre girder. The space is not wasted but utilised to carry oil fuel and fresh water required for the ship, as well as providing ballast capacity. Shell damage only the double bottom space may be flooded.
This provides a considerable margin of safety, since in the event of bottom Double Bottom Tank: An inner bottom (or tank top) may be provided at a minimum heightĪbove the bottom shell, and maintained watertight to the bilges.
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