How does stage flooding work in Calc? What are the principles behind the calculation?
Stage flooding works as described below. • The final state is determined using the normal deterministic procedures, with damage compartments flooded to the outside waterline. When the ship is heeled to calculate the righting lever (GZ) curve, damaged compartments are assumed to be open to the sea, and hence their contents will vary, as the ship heels. • The contents of damaged compartments, fully flooded at the equilibrium angle, are then used to set up stage flooding conditions, i.e. if a compartment is specified as being 20% full at stage 2, then this means 20% of the fully flooded volume. • When calculating the stage flooding GZ curve, the contents of damaged compartment, are assumed to remain constant, i.e. a compartment is treated as if it were intact containing a given weight of water. • This implies that a stage where compartents are specified to be 100% full, is NOT the same as the fully flooded condition, as in the first case, the compartments will contain a constant weight of
