Edit Sheet

The required criterion is selected from the list. Set the Criterion Type which governs the required calculation procedure by selecting one of the available options. Then enter the required Criterion value relevant for the type selected, that means, limiting angle, area, If the Container criterion check box is selected, a form factor C is calculated and used for the criterion as described in IMO Resolution A.749(18) for containerships greater than 100m. Some further input data is required for the calculation of C, which is found in the Options dialog.

Edit Assessment Criteria Dialog - Edit Sheet

Apply this Criterion

This section of the dialog allows you to control the applicability of the criterion for the following: condition state (intact and damage), symmetry at equilibrium, stage flooding states and deck edge immersion at equilibrium. Four options are provided, via drop-down lists, for each of the applicability parameters.

Limits on Righting Lever Curves

Note:
All values are given in degrees.

This section of the dialog defines the lower and upper limits of the residual heel range for evaluating the criterion. For Heel angle, the two limits are actual values. For example, to calculate the area between 30 and 40 degrees, enter 30 for the Lower limit and 40 for the Upper limit. For all the other items, the Lower limit value entered is subtracted from the appropriate angle, and the Upper limit value entered is added to the appropriate angle.

Note:
The equilibrium and downflooding (capsize) angles are automatically taken into account.

The maximum of all the resolved Lower limits is taken as the lower limiting angle for the criterion. Similarly the minimum of all the resolved Upper limits is taken as the upper limiting angle for the criterion. Thus items which do not apply should be given a high value (for example, 90.0).

For criterion types such as 5, 6, 7, 8 and 9 the Lower limit is the angle at which the criterion is applied. For example, if the criterion applies at the equilibrium angle, set the From Equilibrium, lower limit to zero; and for criterion type 6, to specify the GM in the upright position, set the Heel Angle lower limit to zero.

Heeling Moments

Various regulations use different heeling curves, based on various parameters. Those curves that are available in Calc are contained in the drop-down list. On selecting a curve type, the dialog will change to display the relevant curve parameters. you can enter the required values by consulting the appropriate regulations. Please note that on selecting a different curve type a warning dialog appears asking Do you wish to set moment defaults?. Clicking Yes results in the default values (stored in Calc) for this curve type, to be generated for the parameters.

Note:
A generic cosine curve feature is used to provide the wind heeling lever for the criteria type 17 as used in the German Ministry of Transport L<=100 criteria set. Whereas the generic curve has g defined as 9.81 m/s2, this particular regulatory body has g defined as 10 m/s2. Because of this, to get the wind pressure required by the regulatory body, you should specify a figure in N/m2, equal to 98.1% of the required value. for example, for 300 N/m2, specify 284.3 N/m2.
It is to be noted that all other Edit activities, as described in the following text are at the node/icon activity level.

Note:
See Operator’s Instructions - Technical Reference, for a detailed description of how the different heeling moment curves are calculated.