Protected Openings

Calc uses the protected openings defined in this dialog when performing loading calculations, deterministic calculations and probabilistic calculations. A protected opening is one which is protected by a non-return flap, such as an air pipe.

The location of each protected opening is given by x, y and z co-ordinates (X val, Y val and Z val respectively, measured relative to the vessel's origin in meters or feet).

The compartment to which a protected opening is associated, should be selected from the drop-down list in the 'Comp ID' column.

In Calc, a protected opening cannot cause a step in the GZ curve. Its sole function is to restrict the assessment of the GZ curve according to certain stability regulations. The purpose therefore of specifying a compartment is merely that the opening would then be ignored if the compartment were damaged.