Modern cargo ships structural plans- how to use them
Structural plans, sometimes called scantlings plans, show dimensions of the ships framing and plating. The midships section drawing, generally available for all ships, and the shell expansion plan are particularly useful. The midships section drawing provides the data required for the midships section modulus calculation.
The shell expansion plan and larger scale shell plating drawings show details of the hull plating such as the size, thickness, and material of the plating. They also show details of openings, fittings, and appendages attached to the plating. Much of the data needed for designing patches and structural repairs, and for determining the feasibility of making hull cuts can be obtained from shell drawings.
Docking Plans and Reports
In addition to docking information, the ship docking plan shows the underwater profile of the ship, the plan view of its bottom, and locations of underwater appendages, sea suctions, and overboard discharges, with reference points and measurements to locate them. The docking plan also provides vertical measurements from the main deck and base line, the location and dimensions of the docking blocks for the three docking positions, and the critical dimensions of the ship.
Docking reports provide a complete and accurate description of the ship’s bottom. They describe the results of inspections and work done while the ship is in dry dock. Reports for emergent or unplanned dockings do not provide a complete bottom description, but address only the work done during the docking; reports of unplanned drydockings can be considered supplements to the report of the previous regular dry docking. Docking reports are further supplemented by subsequent underwater hull inspection, hull cleaning, and repair or work reports. In addition to an overall description of the ship’s bottom, docking reports include two items of interest to salvors: the shaft covering, if any, and the type of paint applied to the ship’s bottom and appendages. Information on paint systems and coverings alerts the diving supervisor to potential toxic hazards.
Fig:General cargo ships midship cross section
Risk of exceeding loading limitations as in the approved loading manual
Trim and stability booklet for cargo ships
Role of Classification Societies in maintaining cargo ships standard seagoing condition
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