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In Longitudinal framed hull for dry cargo, brackets are used to provide strength to the frame. They are welded to the longitudinal frames as shown in the figure. Sealing plates are used wherever the floors are to be made water tight(Generally in tankers). Frames( Vertical and horizontal frames) are joined at the intersection of two sides is the same way as in transverse design but with the help of web as shown in figure. This helps to resist the bucking force in a much effective way. In longitudinal framing the frames are attached longitudinally to the floor plates instead of transverse. Refer the diagram for a better understanding of the design. Iron transverse is attached between two floor plates to provide additional support and increase structural strength. The frames are attached to the margin plates with the help of flanged bracket as shown in the figure. In this design every floor plate will have 3 frames. The frames are joined together with the help of floor angle iron transverse. The frames run tranversally to the hull structure. In this design there is a plate floor every 3.05 meters and a frame every 1 meter. Though this hull design is outdated, it is still used for smaller ships of length less than 120 meters. The two main methods that are used for hull construction are : Keel plate - They are used to join floor plates to the keel of the ship. Side Girders - Inter coastal plates that are used to join two floor plates. They are attached to the margin plates to resist excessive bending stress. Plate floors run longitudinally throughout the hull floor as shown in the figure.įlanged Bracket -Triangular shaped Iron brackets that are welded where the two frames meet. Plate Floor or Floor plate - A steel plate which is welded to the floor of the hull. They form the basis of any design and all hull designs consist of frames. Frames are welded to the sides of the hull as shown in the figure. Frame- It is a steel plate that runs longitudinally or transversely throughout the hull structure.