Loading Conditions

A complete description of a ship loaded condition is a unique combination of the lightship and of the distributed deadweight at the start, end or during a specific operational voyage. The voyage will generally be to convey a certain cargo, both in material and volume, together with other material such as stores, fuel oil, lub oil and other consumables, crew and effects, Alternatively the voyage may be with the vessel in a 'ballast' condition. The vessel's various loading conditions, combining lightweight and alternative deadweight dispositions, are important aspects regarding both longitudinal strength and trim and stability issues. Although full stability calculations require data of the vessel's loading conditions, as discussed in detail in another section of the help, this application area of Calc deals basically with the determination of the lightship and deadweight loading conditions and the resulting longitudinal strength calculations. However the results of this application also include hydrostatic details and the GZ curve of the vessel in its loaded condition.

In addition to the normal mandatory still water longitudinal strength calculations for the various loading conditions, Calc will also produce vertical bending moment and shear force distributions with the vessel statically balanced on either the crest of a single wave or subtended between two waves, using the wave data that was input with the Ship General Data activities. This, however, is a purely static balancing process and no dynamic, inertial, effects are considered.

Loading conditions are defined by way of displacement and centre of gravity and as such, lightship and deadweight items and their distributions need to be properly defined. Since the actual stability of a loading condition (as well as the critical stability) will be of great importance, defining the exact distribution of liquids is imperative.

This section also contains new modules for Loading/Ballasting Sequences and Continuous Flooding simulation.