![]() When longitudinal strengthening is used, the deck and bottom longitudinals have the greatest scantlings since they stiffen the most highly stressed flanges of the ship girder. The upper ends of the frames are connected to the underside of the deck, clear of the transverses, by brackets. The lower ends of the frames are connected by brackets, which extend to cover the round of the bilge and are connected to the adjacent longitudinal, clear of the transverse. When transverse framing is adopted for the side shell, it is supported by horizontal stringers the number of which will depend on the depth of the tank. ![]() In small and medium sized tankers the side shell may be stiffened by transverse frames but if the tanker exceeds 150 m in length, the side shell is stiffened by longitudinals. ![]() Longitudinal features strengthen the main deck and the bottom. ![]() In most old tankers there is no double bottom. Twin longitudinal bulkheads divide the tank section into port, starboard and centre tanks. ![]()
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