Use the floodable length curve in Section 1, the blue pages, of the Stability Data Reference Book. If the curve represents 45 percent permeability and number 4 hold floods, the vessel will sink if the permeability exceeds what percent?
• Floodable length curve use in the blue pages of the Stability Data Reference Book • Meaning of permeability of a compartment (how much of the volume can be filled with water) • Relationship between given curve permeability (45%) and the maximum permeability before sinking
• On the floodable length curve, what does the plotted point for No. 4 hold at 45% permeability actually represent in terms of margin to sinking? • If the hold actually has a higher permeability than the curve used (45%), does that make the ship more or less resistant to flooding at that location? Why? • Think about whether the critical permeability (where the ship just sinks) must be higher than, equal to, or lower than the curve’s permeability value (45%) in this situation.
• Confirm that permeability is expressed as a percentage of volume that can be occupied by water in the flooded space. • Check on the curve where No. 4 hold is located and understand that the problem states the vessel will sink if the permeability exceeds some value – that value must be compared logically to the 45% used to draw the curve. • Eliminate choices that clearly don’t make sense compared to 45% (is the critical value slightly above, well above, or below 45%?).
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