Principal Structural Members of a Ship (Basic Safety)


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DMMA College of Southern Philippines ( a maritime school)

Published in: Education, Business

Principal Structural Members of a Ship (Basic Safety)

  1. 1. • The Hull • The Keel • The Framing • The Decks • The BulkheadsThe Principal Structures are very important to a ship’s safety. Life, and property both depends on a ship’s structure and should never be taken forgranted.
  2. 2. Regulation 3-1: Structural, mechanical and electrical requirements for ships In addition to the requirements contained elsewhere in the present regulations, ships shall be designed, constructed and maintained in compliance with the structural, mechanical and electrical requirements of a classification society which is recognized by the Administration in accordance with the provisions of regulation XI/ 1, or with applicable national standards of the Administration which provide an equivalent level of safety
  3. 3. • The Hull is the main body of ship exclusive of masts, superstructure and forcastle. • Also composed of shell plating, framing, deacks, bulkheads, angle bars and other parts which we can classify as stiffeners.
  4. 4. • Importance of The Hull  Prevent Ship from breaking into two, even in the most severe seas.  It withstand water preasure and local loads caused by heavy equipment, water shipped on deck and dry docking load.
  5. 5. • What is A Girder?  A girder is a collective term for primary supporting members, usually supporting stiffeners. •In reality, a ship s really made up of girders. A ship is primarily composed of many small girders which are braced and tied together to make the framing system stiff.
  6. 6. The afterpart of the 25-year-old container ship CARLA after breaking in two during a storm 100 miles off the Azores. The disaster occurred after the ship's rudder was damaged, leaving her at the mercy of the heavy seas. The 34-man crew, who took shelter in the stern section, were all taken off by helicopter.The forward half sank after five days, but a tug managed to tow the stern section, carrying 1,000 containers, to Las Palmas. The ship was lengthened 1984, but the vessel's owners denies that the ship had broken apart along one of the welds.
  7. 7. Regulation 1: Strength of Hull The Administration shall satisfy itself that the general structural strength of the hull is sufficient for the draught corresponding to the free-board assigned. Ships built and maintained in conformity with the require-ments of a classification society recognized by the Administration may be considered to possess adequate strength.
  8. 8. •Common causes of hull deformation is mostly the stresses from the external forces or stress which caused by the waves from the sea. •Rolling •Racking •Pounding •Swaying •ETC.
  9. 9. • The keel is a part of a framing of the ship.