Container Vessel Loading for Safe Passage at Sea
This session will introduce you the challenges of loading containers on a container vessle at multiple origin ports for a "Full & Down" condition to achieve maximum voyage revenue while also achieving safe sea passage while optimizing vassel loading and discharge.
- Container Vessel Design
- Safe Sea Passage Requirements
- Ship Stability normally refers to the ability of a floating vessel to resist the overturning forces encountered in the course of its operations. These forces may arise from weather (wind and waves), from tow lines, from abrupt changes of course, from shifting of cargo or passengers, or from flooding due to damage. Stability calculations quantify these forces and apply them in a practical way to a mathematical model of the ship so that the response of the vessel can be examined for various magnitudes of overturning moments.
- Required Stability: In order to be acceptable to classification societies such as the American Bureau of Shipping, Lloyd's Register of Ships, and Det Norske Veritas, calculations must be provided which follow a structure outlined in the regulations for the country in which the ship intends to be flagged. The blueprints of the ship are also reviewed by the classification society.
For U.S. flagged vessels, blueprints and stability calculations are checked against the U.S. Code of Federal Regulations (CFR) and SOLAS conventions. Ships are required to be stable in the conditions to which they are designed for, in both undamaged and damaged states. The extent of damage required to design for is included in the regulations. The assumed hole is calculated as fractions of the length and breadth of the vessel, and is to be placed in the area of the ship where it would cause the most damage to vessel stability.
In addition, U.S. Coast Guard rules apply to vessels operating in U.S. ports and in U.S. waters. Generally these Coast Guard rules concern a minimum metacentric height or a minimum righting moment. Because different countries may have different requirements for the minimum metacentric height, most ships are now fitted with stability computers that calculate this distance on the fly based on the cargo or crew loading.
