Producing Compartment Load Subsets

Within the Loading Condition dialog you can add and name a compartment sub-set, adding this to the current Compartments list. Calc then opens an input file with this name and this can then be entered via the Edit function connected with the Compartments list given in the Loading Condition dialog. These compartments are those that are intended for general bulk dry and/or liquid cargo, break-bulk cargo, Ro-Ro vehicles, for voyage consumables, and for ballast water, , and separate facilities are provided within Calc for holds that are specifically for the conveyance of containers.

A compartment loading subset is made up of one or more compartment loads. The following describes how to create these sub-sets, but before you can do so, he must have first defined the compartment categories, permeabilities and content types as described below. Having created compartment loading subsets, these may then be used in the assembly of various loading conditions.

Calc then presents you with a complete listing of all compartments, with the initial assumption that all compartments are empty. Specific compartments can then be loaded according to the intent of the user-assigned name of the sub-set. The Typical Loading Diagram image illustrates a typical Loading Diagram.

Typical Loading Diagram.

Compartments can be loaded in a variety of different ways; by weight, percentage full, volume, ullage or sounding. To aid the process of entering data in the Input dialog, you are able to view a selection of compartments, filtered on a particular compartment function category. Whereas the compartment category is a global setting for a particular compartment, the content type may vary for different conditions or voyages. you are therefore required to assign the contents type, for example, ore, grain water ballast, , from this dialog. Also from this dialog, you are able to specify the manner in which the free surface effect of a liquid is to be considered. The default option is the traditional approach, whereby a virtual increase to the KG of the vessel is provided by the liquid's free surface moment. In this case, users have the choice of either specifying the transverse second moment of area of the compartment, or of using a value determined by the program for the compartment in an upright state.

The alternative approach is to consider the liquid's true heeling moment by ascertaining the shifting of the liquid at each heel angle. This is referred to as the shift moment, S’M, approach.