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This Concept Map, created with IHMC CmapTools, has information related to: 1 Kenneth Lim - Keels and bottoms, Duct ???? Used on double bottom ships, Transversely framed Spacing up to 3m for plate floor with open floor in between, Transversely framed ship width less than 20m 1 side girder per side of ship, Keels ???? Flat plate, Bar ???? Bar size depends on ship to ship, Double ???? Functions, Stiffeners runs longitudinally ???? Unsupported span of stiffeners should not be more than 2.5m, Floors ???? More when under engine/ machinery room and pounding regions, Flat plate ???? Forms a I structure, Functions ???? Tanks can be fitted for fresh water or ballast, Keels ???? Duct, Protect ship bottom from grounding However Increases draft, Single ???? Ceiling, Ceiling maybe made of Wood / revieted metal plates but not water tight, Bar ???? Protect ship bottom from grounding, Transversely framed Most importantly Stiffeners run transversely, Not more than 3.8m between plate floors with open floors in between Engine room Plate floor fitted in every frame space, Floors ???? Plate/solid floor, 1 side girder per side of ship Ship width more than 20m 2 side girder per side of ship, Floors ???? Open/bracket floor